From: Peter Rabbitson <rabbit+list@rabbit.us>
To: linux-ide@vger.kernel.org
Subject: Mysteriously slow writes SiI 3124
Date: Sun, 01 Mar 2009 23:09:30 +0100 [thread overview]
Message-ID: <49AB079A.9090407@rabbit.us> (raw)
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
next reply other threads:[~2009-03-01 22:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-01 22:09 Peter Rabbitson [this message]
2009-03-04 7:10 ` Mysteriously slow writes SiI 3124 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49AB079A.9090407@rabbit.us \
--to=rabbit+list@rabbit.us \
--cc=linux-ide@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.