Re: 2.6.18 - AHCI detection pauses excessively

["Berck E. Nash" <flyboy@gmail.com>]

Tejun Heo wrote:
> Berck E. Nash wrote:
>> [   68.242305] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>> [   98.221334] ata2.00: qc timeout (cmd 0xec)
>> [   98.225467] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
>> [  108.063137] ata2: port is slow to respond, please be patient (Status 0x80)
>> [  131.003980] ata2: port failed to respond (30 secs, Status 0x80)
>> [  131.009930] ata2: COMRESET failed (device not ready)
>> [  131.014926] ata2: hardreset failed, retrying in 5 secs
>> [  138.308717] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>> [  138.319554] ata2.00: ATA-6, max UDMA/133, 640 sectors: LBA 
>> [  138.325157] ata2.00: ata2: dev 0 multi count 1
>> [  138.334245] ata2.00: configured for UDMA/133
> [--snip--]
>> [  143.191590] scsi 2:0:0:0: Direct-Access     ATA      Config  Disk     RGL1 PQ: 0 ANSI: 5
>> [  143.199761] SCSI device sdd: 640 512-byte hdwr sectors (0 MB)
>> [  143.205550] sdd: Write Protect is off
>> [  143.209257] SCSI device sdd: write cache: disabled, read cache: enabled, doesn't support DPO or FUA
>> [  143.218356] SCSI device sdd: 640 512-byte hdwr sectors (0 MB)
>> [  143.224143] sdd: Write Protect is off
>> [  143.227847] SCSI device sdd: write cache: disabled, read cache: enabled, doesn't support DPO or FUA
>> [  143.236927]  sdd: unknown partition table
>> [  143.241194] sd 2:0:0:0: Attached scsi disk sdd
>> [  143.245707] sd 2:0:0:0: Attached scsi generic sg3 type 0
> 
> Ahh.. I can't believe I missed this again.  A Port Multiplier is
> attached to your ata2 which is probably a sil3726 or 4726.  Why this
> device fails initial reset is unknown yet.  Anyways, with proper PMP
> support, this problem will go away.  So, this isn't really a ahci issue
> and there's nothing wrong with your disks either.  I'll ask SIMG why
> this happens with the PMP.

Hrm.  It's not a Silicon Image chip, or at least doesn't claim to be:


00:1f.2 SATA controller: Intel Corporation 82801GR/GH (ICH7 Family)
Serial ATA Storage Controller AHCI (rev 01) (prog-if 01 [AHCI 1.0])
        Subsystem: ASUSTeK Computer Inc. Unknown device 2606
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin B routed to IRQ 316
        Region 0: I/O ports at e400 [size=8]
        Region 1: I/O ports at e080 [size=4]
        Region 2: I/O ports at e000 [size=8]
        Region 3: I/O ports at dc00 [size=4]
        Region 4: I/O ports at d880 [size=16]
        Region 5: Memory at febfb800 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [80] Message Signalled Interrupts: Mask- 64bit-
Queue=0/0 Enable+
                Address: fee0300c  Data: 4179
        Capabilities: [70] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-

And, remember, this behavior started in 2.6.18 and didn't exist in
2.6.17.  Would it help if I narrowed down which patch caused it?

Berck