* Mysteriously slow writes SiI 3124
@ 2009-03-01 22:09 Peter Rabbitson
2009-03-04 7:10 ` Peter Rabbitson
0 siblings, 1 reply; 6+ messages in thread
From: Peter Rabbitson @ 2009-03-01 22:09 UTC (permalink / raw)
To: linux-ide
Hello,
I have a sil 3124 PCI-X SATA card with 4 drives attached to it.
When I read simultaneously from all 4 drives, I get the expected
~220MB/s combined read speed, limited by the presence of a 32bit
card on the same bus (entire bus runs on 66mhz, mix of 64 and 32
bit cards). When I write to the drives however I only get half of
that ~106MB/s combined. Can someone shed some light?
All measurements are made on an idle system in single-user mode
Combined read:
root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M & done
[1] 30243
[2] 30244
[3] 30245
[4] 30246
root@Arzamas:~/tr# 500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 9.23146 s, 56.8 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 9.3649 s, 56.0 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 9.59152 s, 54.7 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 9.60045 s, 54.6 MB/s
Combined write:
root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M & done
[1] 30239
[2] 30240
[3] 30241
[4] 30242
root@Arzamas:~/tr# 500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 19.4508 s, 27.0 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 19.6314 s, 26.7 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 19.7663 s, 26.5 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 19.7598 s, 26.5 MB/s
Individual read (making sure disks are good):
root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M ; done
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.00963 s, 105 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.15979 s, 102 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.19258 s, 101 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.24153 s, 100 MB/s
root@Arzamas:~/tr#
Individual write:
root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M ; done
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.15325 s, 102 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.36731 s, 97.7 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.24908 s, 99.9 MB/s
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 5.36189 s, 97.8 MB/s
root@Arzamas:~/tr#
Card:
02:03.0 Mass storage controller: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller (rev 02)
Subsystem: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr+ Stepping+ SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 25
Region 0: Memory at fc5fd800 (64-bit, non-prefetchable) [size=128]
Region 2: Memory at fc5f0000 (64-bit, non-prefetchable) [size=32K]
Region 4: I/O ports at bc00 [size=16]
Expansion ROM at fc480000 [disabled] [size=512K]
Capabilities: [64] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [40] PCI-X non-bridge device
Command: DPERE- ERO+ RBC=512 OST=12
Status: Dev=ff:1f.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=12 DMCRS=128 RSCEM- 266MHz- 533MHz-
Capabilities: [54] MSI: Mask- 64bit+ Count=1/1 Enable-
Address: 0000000000000000 Data: 0000
Kernel driver in use: sata_sil24
Disks (excerpt from kernel bootup):
sata_sil24 0000:02:03.0: version 1.1
sata_sil24 0000:02:03.0: PCI INT A -> GSI 25 (level, low) -> IRQ 25
scsi3 : sata_sil24
scsi4 : sata_sil24
scsi5 : sata_sil24
scsi6 : sata_sil24
ata3: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f0000 irq 25
ata4: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f2000 irq 25
ata5: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f4000 irq 25
ata6: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f6000 irq 25
ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
ata3.00: ATA-8: ST3500320NS, SN05, max UDMA/133
ata3.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
ata3.00: configured for UDMA/100
ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
ata4.00: ATA-8: ST3500320NS, SN05, max UDMA/133
ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
ata4.00: configured for UDMA/100
ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
ata5.00: ATA-8: ST3500320NS, SN05, max UDMA/133
ata5.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
ata5.00: configured for UDMA/100
ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
ata6.00: ATA-8: ST3500320NS, SN05, max UDMA/133
ata6.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
ata6.00: configured for UDMA/100
scsi 3:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sdb: sdb1 sdb2 sdb3
sd 3:0:0:0: [sdb] Attached SCSI disk
scsi 4:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
sd 4:0:0:0: [sdc] Write Protect is off
sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
sd 4:0:0:0: [sdc] Write Protect is off
sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sdc: sdc1 sdc2 sdc3
sd 4:0:0:0: [sdc] Attached SCSI disk
scsi 5:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
sd 5:0:0:0: [sdd] Write Protect is off
sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
sd 5:0:0:0: [sdd] Write Protect is off
sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sdd: sdd1 sdd2 sdd3
sd 5:0:0:0: [sdd] Attached SCSI disk
scsi 6:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
sd 6:0:0:0: [sde] Write Protect is off
sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
sd 6:0:0:0: [sde] Write Protect is off
sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sde: sde1 sde2 sde3
sd 6:0:0:0: [sde] Attached SCSI disk
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Mysteriously slow writes SiI 3124
2009-03-01 22:09 Mysteriously slow writes SiI 3124 Peter Rabbitson
@ 2009-03-04 7:10 ` Peter Rabbitson
2009-03-04 17:10 ` Grant Grundler
2009-03-04 19:06 ` Greg Freemyer
0 siblings, 2 replies; 6+ messages in thread
From: Peter Rabbitson @ 2009-03-04 7:10 UTC (permalink / raw)
To: linux-ide
No takers? Can I provide more info/measurements/whatever? I would
really like to get to the bottom of this, pretty frustrating.
Peter Rabbitson wrote:
> Hello,
>
> I have a sil 3124 PCI-X SATA card with 4 drives attached to it.
> When I read simultaneously from all 4 drives, I get the expected
> ~220MB/s combined read speed, limited by the presence of a 32bit
> card on the same bus (entire bus runs on 66mhz, mix of 64 and 32
> bit cards). When I write to the drives however I only get half of
> that ~106MB/s combined. Can someone shed some light?
>
> All measurements are made on an idle system in single-user mode
>
>
> Combined read:
> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M & done
> [1] 30243
> [2] 30244
> [3] 30245
> [4] 30246
> root@Arzamas:~/tr# 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 9.23146 s, 56.8 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 9.3649 s, 56.0 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 9.59152 s, 54.7 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 9.60045 s, 54.6 MB/s
>
>
> Combined write:
> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M & done
> [1] 30239
> [2] 30240
> [3] 30241
> [4] 30242
> root@Arzamas:~/tr# 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 19.4508 s, 27.0 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 19.6314 s, 26.7 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 19.7663 s, 26.5 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 19.7598 s, 26.5 MB/s
>
>
> Individual read (making sure disks are good):
> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M ; done
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.00963 s, 105 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.15979 s, 102 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.19258 s, 101 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.24153 s, 100 MB/s
> root@Arzamas:~/tr#
>
>
> Individual write:
> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M ; done
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.15325 s, 102 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.36731 s, 97.7 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.24908 s, 99.9 MB/s
> 500+0 records in
> 500+0 records out
> 524288000 bytes (524 MB) copied, 5.36189 s, 97.8 MB/s
> root@Arzamas:~/tr#
>
>
> Card:
> 02:03.0 Mass storage controller: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller (rev 02)
> Subsystem: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller
> Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr+ Stepping+ SERR+ FastB2B- DisINTx-
> Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 64, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 25
> Region 0: Memory at fc5fd800 (64-bit, non-prefetchable) [size=128]
> Region 2: Memory at fc5f0000 (64-bit, non-prefetchable) [size=32K]
> Region 4: I/O ports at bc00 [size=16]
> Expansion ROM at fc480000 [disabled] [size=512K]
> Capabilities: [64] Power Management version 2
> Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=1 PME-
> Capabilities: [40] PCI-X non-bridge device
> Command: DPERE- ERO+ RBC=512 OST=12
> Status: Dev=ff:1f.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=12 DMCRS=128 RSCEM- 266MHz- 533MHz-
> Capabilities: [54] MSI: Mask- 64bit+ Count=1/1 Enable-
> Address: 0000000000000000 Data: 0000
> Kernel driver in use: sata_sil24
>
>
> Disks (excerpt from kernel bootup):
> sata_sil24 0000:02:03.0: version 1.1
> sata_sil24 0000:02:03.0: PCI INT A -> GSI 25 (level, low) -> IRQ 25
> scsi3 : sata_sil24
> scsi4 : sata_sil24
> scsi5 : sata_sil24
> scsi6 : sata_sil24
> ata3: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f0000 irq 25
> ata4: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f2000 irq 25
> ata5: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f4000 irq 25
> ata6: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f6000 irq 25
> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
> ata3.00: ATA-8: ST3500320NS, SN05, max UDMA/133
> ata3.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata3.00: configured for UDMA/100
> ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
> ata4.00: ATA-8: ST3500320NS, SN05, max UDMA/133
> ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata4.00: configured for UDMA/100
> ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
> ata5.00: ATA-8: ST3500320NS, SN05, max UDMA/133
> ata5.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata5.00: configured for UDMA/100
> ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
> ata6.00: ATA-8: ST3500320NS, SN05, max UDMA/133
> ata6.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata6.00: configured for UDMA/100
> scsi 3:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
> sd 3:0:0:0: [sdb] Write Protect is off
> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
> sd 3:0:0:0: [sdb] Write Protect is off
> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sdb: sdb1 sdb2 sdb3
> sd 3:0:0:0: [sdb] Attached SCSI disk
> scsi 4:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
> sd 4:0:0:0: [sdc] Write Protect is off
> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
> sd 4:0:0:0: [sdc] Write Protect is off
> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sdc: sdc1 sdc2 sdc3
> sd 4:0:0:0: [sdc] Attached SCSI disk
> scsi 5:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
> sd 5:0:0:0: [sdd] Write Protect is off
> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
> sd 5:0:0:0: [sdd] Write Protect is off
> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sdd: sdd1 sdd2 sdd3
> sd 5:0:0:0: [sdd] Attached SCSI disk
> scsi 6:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
> sd 6:0:0:0: [sde] Write Protect is off
> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
> sd 6:0:0:0: [sde] Write Protect is off
> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> sde: sde1 sde2 sde3
> sd 6:0:0:0: [sde] Attached SCSI disk
> --
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Mysteriously slow writes SiI 3124
2009-03-04 7:10 ` Peter Rabbitson
@ 2009-03-04 17:10 ` Grant Grundler
2009-03-04 17:39 ` Peter Rabbitson
2009-04-01 5:34 ` James Andrewartha
2009-03-04 19:06 ` Greg Freemyer
1 sibling, 2 replies; 6+ messages in thread
From: Grant Grundler @ 2009-03-04 17:10 UTC (permalink / raw)
To: Peter Rabbitson; +Cc: linux-ide
On Tue, Mar 3, 2009 at 11:10 PM, Peter Rabbitson <rabbit+list@rabbit.us> wrote:
> No takers? Can I provide more info/measurements/whatever? I would
> really like to get to the bottom of this, pretty frustrating.
Are you ok with wild guesses?
This sounds remarkable similar to the performance of the equivalent
PCIe SATA controller from Silicon Image (3132). The 3132 has 1 PCI-E
lane and should able to move more than 220 MB/s or so. But in fact can
only read 120MB/s and write 170MB/s.
I would either try a different SATA controller in the same slot of the
same host machine OR try the same SATA controller in a different host
machine just to rule out issues with the system chipset.
One other wild guess would be some environmental problem with the disk
drives. If they are hot or being vibrated (e.g. enclosure fan), write
performance will suffer more than read performance. Since these are
500G "Nearline" drives, I expect them to do better under
"adverse" conditions than predecessor "Desktop" (model number ends with "AS").
hth,
grant
>
> Peter Rabbitson wrote:
>> Hello,
>>
>> I have a sil 3124 PCI-X SATA card with 4 drives attached to it.
>> When I read simultaneously from all 4 drives, I get the expected
>> ~220MB/s combined read speed, limited by the presence of a 32bit
>> card on the same bus (entire bus runs on 66mhz, mix of 64 and 32
>> bit cards). When I write to the drives however I only get half of
>> that ~106MB/s combined. Can someone shed some light?
>>
>> All measurements are made on an idle system in single-user mode
>>
>>
>> Combined read:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M & done
>> [1] 30243
>> [2] 30244
>> [3] 30245
>> [4] 30246
>> root@Arzamas:~/tr# 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.23146 s, 56.8 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.3649 s, 56.0 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.59152 s, 54.7 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.60045 s, 54.6 MB/s
>>
>>
>> Combined write:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M & done
>> [1] 30239
>> [2] 30240
>> [3] 30241
>> [4] 30242
>> root@Arzamas:~/tr# 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.4508 s, 27.0 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.6314 s, 26.7 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.7663 s, 26.5 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.7598 s, 26.5 MB/s
>>
>>
>> Individual read (making sure disks are good):
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M ; done
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.00963 s, 105 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.15979 s, 102 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.19258 s, 101 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.24153 s, 100 MB/s
>> root@Arzamas:~/tr#
>>
>>
>> Individual write:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M ; done
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.15325 s, 102 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.36731 s, 97.7 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.24908 s, 99.9 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.36189 s, 97.8 MB/s
>> root@Arzamas:~/tr#
>>
>>
>> Card:
>> 02:03.0 Mass storage controller: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller (rev 02)
>> Subsystem: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller
>> Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr+ Stepping+ SERR+ FastB2B- DisINTx-
>> Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>> Latency: 64, Cache Line Size: 64 bytes
>> Interrupt: pin A routed to IRQ 25
>> Region 0: Memory at fc5fd800 (64-bit, non-prefetchable) [size=128]
>> Region 2: Memory at fc5f0000 (64-bit, non-prefetchable) [size=32K]
>> Region 4: I/O ports at bc00 [size=16]
>> Expansion ROM at fc480000 [disabled] [size=512K]
>> Capabilities: [64] Power Management version 2
>> Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
>> Status: D0 PME-Enable- DSel=0 DScale=1 PME-
>> Capabilities: [40] PCI-X non-bridge device
>> Command: DPERE- ERO+ RBC=512 OST=12
>> Status: Dev=ff:1f.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=12 DMCRS=128 RSCEM- 266MHz- 533MHz-
>> Capabilities: [54] MSI: Mask- 64bit+ Count=1/1 Enable-
>> Address: 0000000000000000 Data: 0000
>> Kernel driver in use: sata_sil24
>>
>>
>> Disks (excerpt from kernel bootup):
>> sata_sil24 0000:02:03.0: version 1.1
>> sata_sil24 0000:02:03.0: PCI INT A -> GSI 25 (level, low) -> IRQ 25
>> scsi3 : sata_sil24
>> scsi4 : sata_sil24
>> scsi5 : sata_sil24
>> scsi6 : sata_sil24
>> ata3: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f0000 irq 25
>> ata4: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f2000 irq 25
>> ata5: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f4000 irq 25
>> ata6: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f6000 irq 25
>> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>> ata3.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>> ata3.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>> ata3.00: configured for UDMA/100
>> ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>> ata4.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>> ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>> ata4.00: configured for UDMA/100
>> ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>> ata5.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>> ata5.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>> ata5.00: configured for UDMA/100
>> ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>> ata6.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>> ata6.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>> ata6.00: configured for UDMA/100
>> scsi 3:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
>> sd 3:0:0:0: [sdb] Write Protect is off
>> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
>> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
>> sd 3:0:0:0: [sdb] Write Protect is off
>> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
>> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sdb: sdb1 sdb2 sdb3
>> sd 3:0:0:0: [sdb] Attached SCSI disk
>> scsi 4:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
>> sd 4:0:0:0: [sdc] Write Protect is off
>> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
>> sd 4:0:0:0: [sdc] Write Protect is off
>> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sdc: sdc1 sdc2 sdc3
>> sd 4:0:0:0: [sdc] Attached SCSI disk
>> scsi 5:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
>> sd 5:0:0:0: [sdd] Write Protect is off
>> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
>> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
>> sd 5:0:0:0: [sdd] Write Protect is off
>> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
>> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sdd: sdd1 sdd2 sdd3
>> sd 5:0:0:0: [sdd] Attached SCSI disk
>> scsi 6:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
>> sd 6:0:0:0: [sde] Write Protect is off
>> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
>> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
>> sd 6:0:0:0: [sde] Write Protect is off
>> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
>> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> sde: sde1 sde2 sde3
>> sd 6:0:0:0: [sde] Attached SCSI disk
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Mysteriously slow writes SiI 3124
2009-03-04 17:10 ` Grant Grundler
@ 2009-03-04 17:39 ` Peter Rabbitson
2009-04-01 5:34 ` James Andrewartha
1 sibling, 0 replies; 6+ messages in thread
From: Peter Rabbitson @ 2009-03-04 17:39 UTC (permalink / raw)
To: Grant Grundler; +Cc: linux-ide
Grant Grundler wrote:
> On Tue, Mar 3, 2009 at 11:10 PM, Peter Rabbitson <rabbit+list@rabbit.us> wrote:
>> No takers? Can I provide more info/measurements/whatever? I would
>> really like to get to the bottom of this, pretty frustrating.
>
> Are you ok with wild guesses?
> This sounds remarkable similar to the performance of the equivalent
> PCIe SATA controller from Silicon Image (3132). The 3132 has 1 PCI-E
> lane and should able to move more than 220 MB/s or so. But in fact can
> only read 120MB/s and write 170MB/s.
Interesting...
> I would either try a different SATA controller in the same slot of the
> same host machine OR try the same SATA controller in a different host
> machine just to rule out issues with the system chipset.
Hm... since this is a PCI-X I can't really try it anywhere else... but then
I can just stick it into a 32bit PCI slot, and see what happens then (as
it should give me at least equal-to-read speed).
> One other wild guess would be some environmental problem with the disk
> drives. If they are hot or being vibrated (e.g. enclosure fan), write
> performance will suffer more than read performance. Since these are
> 500G "Nearline" drives, I expect them to do better under
> "adverse" conditions than predecessor "Desktop" (model number ends with "AS").
A hard drive problem (environmental or otherwise) would not explain the
performance difference when doing IO on a single drive vs doing it on
several at the same time. It got to be something bus congestion related.
Thank you for your input!
>> Peter Rabbitson wrote:
>>> Hello,
>>>
>>> I have a sil 3124 PCI-X SATA card with 4 drives attached to it.
>>> When I read simultaneously from all 4 drives, I get the expected
>>> ~220MB/s combined read speed, limited by the presence of a 32bit
>>> card on the same bus (entire bus runs on 66mhz, mix of 64 and 32
>>> bit cards). When I write to the drives however I only get half of
>>> that ~106MB/s combined. Can someone shed some light?
>>>
>>> All measurements are made on an idle system in single-user mode
>>>
>>>
>>> Combined read:
>>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M & done
>>> [1] 30243
>>> [2] 30244
>>> [3] 30245
>>> [4] 30246
>>> root@Arzamas:~/tr# 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 9.23146 s, 56.8 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 9.3649 s, 56.0 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 9.59152 s, 54.7 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 9.60045 s, 54.6 MB/s
>>>
>>>
>>> Combined write:
>>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M & done
>>> [1] 30239
>>> [2] 30240
>>> [3] 30241
>>> [4] 30242
>>> root@Arzamas:~/tr# 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 19.4508 s, 27.0 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 19.6314 s, 26.7 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 19.7663 s, 26.5 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 19.7598 s, 26.5 MB/s
>>>
>>>
>>> Individual read (making sure disks are good):
>>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M ; done
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.00963 s, 105 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.15979 s, 102 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.19258 s, 101 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.24153 s, 100 MB/s
>>> root@Arzamas:~/tr#
>>>
>>>
>>> Individual write:
>>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M ; done
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.15325 s, 102 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.36731 s, 97.7 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.24908 s, 99.9 MB/s
>>> 500+0 records in
>>> 500+0 records out
>>> 524288000 bytes (524 MB) copied, 5.36189 s, 97.8 MB/s
>>> root@Arzamas:~/tr#
>>>
>>>
>>> Card:
>>> 02:03.0 Mass storage controller: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller (rev 02)
>>> Subsystem: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller
>>> Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr+ Stepping+ SERR+ FastB2B- DisINTx-
>>> Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>> Latency: 64, Cache Line Size: 64 bytes
>>> Interrupt: pin A routed to IRQ 25
>>> Region 0: Memory at fc5fd800 (64-bit, non-prefetchable) [size=128]
>>> Region 2: Memory at fc5f0000 (64-bit, non-prefetchable) [size=32K]
>>> Region 4: I/O ports at bc00 [size=16]
>>> Expansion ROM at fc480000 [disabled] [size=512K]
>>> Capabilities: [64] Power Management version 2
>>> Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
>>> Status: D0 PME-Enable- DSel=0 DScale=1 PME-
>>> Capabilities: [40] PCI-X non-bridge device
>>> Command: DPERE- ERO+ RBC=512 OST=12
>>> Status: Dev=ff:1f.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=12 DMCRS=128 RSCEM- 266MHz- 533MHz-
>>> Capabilities: [54] MSI: Mask- 64bit+ Count=1/1 Enable-
>>> Address: 0000000000000000 Data: 0000
>>> Kernel driver in use: sata_sil24
>>>
>>>
>>> Disks (excerpt from kernel bootup):
>>> sata_sil24 0000:02:03.0: version 1.1
>>> sata_sil24 0000:02:03.0: PCI INT A -> GSI 25 (level, low) -> IRQ 25
>>> scsi3 : sata_sil24
>>> scsi4 : sata_sil24
>>> scsi5 : sata_sil24
>>> scsi6 : sata_sil24
>>> ata3: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f0000 irq 25
>>> ata4: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f2000 irq 25
>>> ata5: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f4000 irq 25
>>> ata6: SATA max UDMA/100 host m128@0xfc5fd800 port 0xfc5f6000 irq 25
>>> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>>> ata3.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>>> ata3.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>>> ata3.00: configured for UDMA/100
>>> ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>>> ata4.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>>> ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>>> ata4.00: configured for UDMA/100
>>> ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>>> ata5.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>>> ata5.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>>> ata5.00: configured for UDMA/100
>>> ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>>> ata6.00: ATA-8: ST3500320NS, SN05, max UDMA/133
>>> ata6.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>>> ata6.00: configured for UDMA/100
>>> scsi 3:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>>> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 3:0:0:0: [sdb] Write Protect is off
>>> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
>>> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sd 3:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 3:0:0:0: [sdb] Write Protect is off
>>> sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
>>> sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sdb: sdb1 sdb2 sdb3
>>> sd 3:0:0:0: [sdb] Attached SCSI disk
>>> scsi 4:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>>> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 4:0:0:0: [sdc] Write Protect is off
>>> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>>> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sd 4:0:0:0: [sdc] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 4:0:0:0: [sdc] Write Protect is off
>>> sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>>> sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sdc: sdc1 sdc2 sdc3
>>> sd 4:0:0:0: [sdc] Attached SCSI disk
>>> scsi 5:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>>> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 5:0:0:0: [sdd] Write Protect is off
>>> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
>>> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sd 5:0:0:0: [sdd] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 5:0:0:0: [sdd] Write Protect is off
>>> sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
>>> sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sdd: sdd1 sdd2 sdd3
>>> sd 5:0:0:0: [sdd] Attached SCSI disk
>>> scsi 6:0:0:0: Direct-Access ATA ST3500320NS SN05 PQ: 0 ANSI: 5
>>> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 6:0:0:0: [sde] Write Protect is off
>>> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
>>> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sd 6:0:0:0: [sde] 976773168 512-byte hardware sectors (500108 MB)
>>> sd 6:0:0:0: [sde] Write Protect is off
>>> sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
>>> sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> sde: sde1 sde2 sde3
>>> sd 6:0:0:0: [sde] Attached SCSI disk
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Mysteriously slow writes SiI 3124
2009-03-04 17:10 ` Grant Grundler
2009-03-04 17:39 ` Peter Rabbitson
@ 2009-04-01 5:34 ` James Andrewartha
1 sibling, 0 replies; 6+ messages in thread
From: James Andrewartha @ 2009-04-01 5:34 UTC (permalink / raw)
To: Grant Grundler; +Cc: Peter Rabbitson, linux-ide
Grant Grundler wrote:
> On Tue, Mar 3, 2009 at 11:10 PM, Peter Rabbitson <rabbit+list@rabbit.us> wrote:
>> No takers? Can I provide more info/measurements/whatever? I would
>> really like to get to the bottom of this, pretty frustrating.
>
> Are you ok with wild guesses?
> This sounds remarkable similar to the performance of the equivalent
> PCIe SATA controller from Silicon Image (3132). The 3132 has 1 PCI-E
> lane and should able to move more than 220 MB/s or so. But in fact can
> only read 120MB/s and write 170MB/s.
The hardware is limited:
http://ata.wiki.kernel.org/index.php/Hardware,_driver_status#Silicon_Image_3124
http://www.mail-archive.com/linux-ide@vger.kernel.org/msg10143.html
http://markmail.org/message/dkwn2imwkjg7aeyl
--
James Andrewartha
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Mysteriously slow writes SiI 3124
2009-03-04 7:10 ` Peter Rabbitson
2009-03-04 17:10 ` Grant Grundler
@ 2009-03-04 19:06 ` Greg Freemyer
1 sibling, 0 replies; 6+ messages in thread
From: Greg Freemyer @ 2009-03-04 19:06 UTC (permalink / raw)
To: Peter Rabbitson; +Cc: linux-ide
On Wed, Mar 4, 2009 at 2:10 AM, Peter Rabbitson <rabbit+list@rabbit.us> wrote:
> No takers? Can I provide more info/measurements/whatever? I would
> really like to get to the bottom of this, pretty frustrating.
>
> Peter Rabbitson wrote:
>> Hello,
>>
>> I have a sil 3124 PCI-X SATA card with 4 drives attached to it.
>> When I read simultaneously from all 4 drives, I get the expected
>> ~220MB/s combined read speed, limited by the presence of a 32bit
>> card on the same bus (entire bus runs on 66mhz, mix of 64 and 32
>> bit cards). When I write to the drives however I only get half of
>> that ~106MB/s combined. Can someone shed some light?
>>
>> All measurements are made on an idle system in single-user mode
>>
>>
>> Combined read:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M & done
>> [1] 30243
>> [2] 30244
>> [3] 30245
>> [4] 30246
>> root@Arzamas:~/tr# 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.23146 s, 56.8 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.3649 s, 56.0 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.59152 s, 54.7 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 9.60045 s, 54.6 MB/s
>>
>>
>> Combined write:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M & done
>> [1] 30239
>> [2] 30240
>> [3] 30241
>> [4] 30242
>> root@Arzamas:~/tr# 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.4508 s, 27.0 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.6314 s, 26.7 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.7663 s, 26.5 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 19.7598 s, 26.5 MB/s
>>
>>
>> Individual read (making sure disks are good):
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd if="/dev/${d}2" of=/dev/null count=500 bs=1M ; done
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.00963 s, 105 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.15979 s, 102 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.19258 s, 101 MB/s
>> 500+0 records in
>> 500+0 records out
>> 524288000 bytes (524 MB) copied, 5.24153 s, 100 MB/s
>> root@Arzamas:~/tr#
>>
>>
>> Individual write:
>> root@Arzamas:~/tr# for d in sde sdb sdc sdd ; do dd of="/dev/${d}2" if=/dev/zero count=500 bs=1M ; done
<snip>
Did you verify /dev/zero is not the problem.
It has been known to have throughput bugs that limit its ability to
generate zeros. Strange I know.
I always do a quick dd if=/dev/zero of=/dev/null bs=1m count=10000
type test to make sure I have good functionality in /dev/zero and
/dev/null. (Never heard of an issue with /dev/null, but I have to
send those zeros somewhere.)
Greg
--
Greg Freemyer
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer
First 99 Days Litigation White Paper -
http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf
The Norcross Group
The Intersection of Evidence & Technology
http://www.norcrossgroup.com
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2009-04-01 5:42 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-03-01 22:09 Mysteriously slow writes SiI 3124 Peter Rabbitson
2009-03-04 7:10 ` Peter Rabbitson
2009-03-04 17:10 ` Grant Grundler
2009-03-04 17:39 ` Peter Rabbitson
2009-04-01 5:34 ` James Andrewartha
2009-03-04 19:06 ` Greg Freemyer
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