linux-kernel - Re: 2.6.24-rc3-mm1

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Date:	Fri, 23 Nov 2007 06:55:41 +0100
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: 2.6.24-rc3-mm1

Andrew Morton wrote:
> On Fri, 23 Nov 2007 02:39:08 +0100 Gabriel C <nix.or.die@...glemail.com> wrote:
> 
>> I have some warnings on each SCSI disc:
>>
>>
>> ...
>>
>> [   30.724410] scsi 0:0:0:0: Direct-Access     SEAGATE  ST318406LW       0109 PQ: 0 ANSI: 3
>> [   30.724419] scsi0:A:0:0: Tagged Queuing enabled.  Depth 32
>> [   30.724435]  target0:0:0: Beginning Domain Validation
>> [   30.724446]  target0:0:0: Domain Validation Initial Inquiry Failed <--
>> [   30.724572]  target0:0:0: Ending Domain Validation
>> [   30.729747] scsi 0:0:1:0: Direct-Access     FUJITSU  MAH3182MP        0114 PQ: 0 ANSI: 4
>> [   30.729754] scsi0:A:1:0: Tagged Queuing enabled.  Depth 32
>> [   30.729771]  target0:0:1: Beginning Domain Validation
>> [   30.729780]  target0:0:1: Domain Validation Initial Inquiry Failed <--
>> [   30.729908]  target0:0:1: Ending Domain Validation
>>
> 
> Don't know what would have caused that.  But yes, something is wrong in
> scsi land.

Actually I'm lucky the author didn't fix that FIXME in scsi_transport_spi.c and I still can boot ;)

> 
>> no idea whatever this is related but buffered disk reads are 2.XX MB/sec and the box is somewhat laggy.
>>
>> hdparm -t on sda and sdb reports :
>>
>> /dev/sda:
>>  Timing buffered disk reads:    8 MB in  3.26 seconds =   2.46 MB/sec
>>
>> /dev/sdb:
>>  Timing buffered disk reads:    8 MB in  3.56 seconds =   2.25 MB/sec
>>
>> My IDE discs are fine.
>>
>> Please let me know if you need my config or any other informations.
>>
> 
> And you're the second to report very slow scsi throughput in 2.6.24-rc3-mm1.
> 

I found the commit which cause these problems , it is in git-scsi-misc patch and reverting it fixes both problems for me.

http://git.kernel.org/?p=linux/kernel/git/jejb/scsi-misc-2.6.git;a=commitdiff_plain;h=8655a546c83fc43f0a73416bbd126d02de7ad6c0;hp=5bc717b6bdaaf52edf365eb7d9d8c89fec79df5d


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