From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750926AbWDYIp3 (ORCPT ); Tue, 25 Apr 2006 04:45:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751464AbWDYIp3 (ORCPT ); Tue, 25 Apr 2006 04:45:29 -0400 Received: from 220-130-178-142.HINET-IP.hinet.net ([220.130.178.142]:57645 "EHLO areca.com.tw") by vger.kernel.org with ESMTP id S1750926AbWDYIp3 (ORCPT ); Tue, 25 Apr 2006 04:45:29 -0400 Message-ID: <01fe01c66844$96c16780$b100a8c0@erich2003> From: "erich" To: "Randy.Dunlap" Cc: , , , , , , , References: <007701c653d7$8b8ee670$b100a8c0@erich2003><004a01c65470$412daaa0$b100a8c0@erich2003><20060330192057.4bd8c568.akpm@osdl.org><20060331074237.GH14022@suse.de><002901c65e33$ceac9e00$b100a8c0@erich2003><20060419104009.GB614@suse.de><003301c663b3$6bfcc020$b100a8c0@erich2003><20060419131916.GH614@suse.de><001401c6641d$586bd950$b100a8c0@erich2003><20060420064249.GO614@suse.de><001e01c66451$f9a470f0$b100a8c0@erich2003> <20060420083812.d47a74bb.rdunlap@xenotime.net> Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken Date: Tue, 25 Apr 2006 16:45:18 +0800 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.3790.2663 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2663 X-OriginalArrivalTime: 25 Apr 2006 08:40:11.0343 (UTC) FILETIME=[DD69BDF0:01C66843] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Dear Randy.Dunlap, If it is true, I will add sg count check in arcmsr. Driver report : host->sg_tablesize=ARCMSR_MAX_SG_ENTRIES to linux scsi host layer. But got an incorrect request of sg list count from .queuecommand. Could you tell me which value of ARCMSR_MAX_XFER_SECTORS (4096/512)? Best Regards Erich chen ----- Original Message ----- From: "Randy.Dunlap" To: "erich" Cc: ; ; ; ; ; ; ; ; Sent: Thursday, April 20, 2006 11:38 PM Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken > On Thu, 20 Apr 2006 16:11:04 +0800 erich wrote: > >> Dear Dear Jens Axboe, >> >> Thanks for your notification and advice. >> Areca's firmware has max sg entries of 38 limit. >> In my debug driver I had add this condition check. >> But no one request more than 38 sg. > > Yesterday I saw a request with 70 sg pieces. It was while > running mkfs.ext3 . > >> Both transfer length all have a lot of requests equal with 38 sg. >> But why it ocur only at 4096 sectors? >> If the /sys/block/sda/queue/max_sectors_kb equal 256 all operation >> running >> well. >> But if I modify it more than 256, the bug appeared. >> I will do more research about why there were a lot of requests equal >> with >> 38 sg in all file system. >> And only it ocur at the volume that format with mkfs.ext2. >> Thanks again. >> >> Best Regards >> Erich Chen >> >> ----- Original Message ----- >> From: "Jens Axboe" >> To: "erich" >> Cc: ; ; "Al Viro" >> ; "Andrew Morton" ; "Randy.Dunlap" >> ; "Matti Aarnio" ; >> ; "James Bottomley" >> ; "Chris Caputo" >> Sent: Thursday, April 20, 2006 2:42 PM >> Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken >> >> >> > On Thu, Apr 20 2006, erich wrote: >> >> Dear Jens Axboe, >> >> >> >> I do "fsck -fy /dev/sda1" on driver MAX_XFER_SECTORS 512. >> >> The file system was not clean. >> >> I attach mesg.txt for you refer to. >> >> >> >> ===================================== >> >> == boot with driver MAX_XFER_SECTORS 4096 >> >> ===================================== >> >> #mkfs.ext2 /dev/sda1 >> >> #reboot >> >> ===================================== >> >> == boot with driver MAX_XFER_SECTORS 512 >> >> ===================================== >> >> #fsck -fy /dev/sda1 >> >> /dev/sda1:clean,............. >> >> #reboot >> >> ===================================== >> >> == boot with driver MAX_XFER_SECTORS 4096 >> >> ===================================== >> >> #mount /dev/sda1 /mnt/sda1 >> >> #cp /root/aa /mnt/sda1 >> >> #reboot >> >> ===================================== >> >> == boot with driver MAX_XFER_SECTORS 512 >> >> ===================================== >> >> #fsck -fy /dev/sda1 >> >> /dev/sda1: no clean,........and dump message such as the attach file >> >> mesg.txt. >> > >> > So the conclusion is that your driver and/or hardware corrupts data >> > when >> > you set MAX_XFER_SECTORS too high. I can't help you anymore with this, >> > you should be in the best position to debug the driver and/or hardware >> > :-) >> > >> > It could be that the higher setting just exposes another transfer >> > setting bug, like maximum number of segments or segment size, etc. >> > >> > -- >> > Jens Axboe >> > >> >> > > > --- > ~Randy