From mboxrd@z Thu Jan 1 00:00:00 1970 From: Proskurin Kirill Subject: Re: [btrfs-transacti] & btrfs-endio-wri] - WAS: Re: [btrfs-delalloc-] Date: Thu, 30 Jun 2011 21:19:33 +0400 Message-ID: <4E0CB025.2020904@corp.mail.ru> References: <4E084786.2070200@corp.mail.ru> <201106271521.54497.hka@qbs.com.pl> <4E0B46CA.2030205@corp.mail.ru> <4E0B4F67.30702@redhat.com> <4E0C8443.7070109@corp.mail.ru> <4E0CAE9E.7000406@redhat.com> Reply-To: Btrfs mailing list Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed To: Btrfs mailing list Return-path: In-Reply-To: <4E0CAE9E.7000406@redhat.com> List-ID: On 06/30/2011 09:13 PM, Josef Bacik wrote: > On 06/30/2011 10:12 AM, Proskurin Kirill wrote: >> On 06/29/2011 08:14 PM, Josef Bacik wrote: >>>> Ok - I upgrade to 2.6.39-2 but it is seems to all things get worse. >>>> Now I see [btrfs-transacti]& btrfs-endio-wri] 80-100% all the time and >>>> io performance looks like lower then before. >>>> >>>> Our scribe daemon in state D most of the time with half of a normal >>>> load. Only kernel was changed. >>>> >>>> Any performance tune recommendation? >>>> >>> >>> Can you get sysrq+w while this problem is happening so we can see whats >>> going on? Thanks, >> >> I attached sysrq+w. Hope it helps. >> > > Heh so it just looks like you are writing a bunch of stuff, that's not > particularly helpful. What does this program do generically? How full > is your fs? Do you have snapshots/subvolumes? If so how many? Thanks, Scribe is taling logs by network. ~300 hosts send it to it and scribe write them to fs. I use zlib compression on btrfs partition. Mount options is noatime,noacl,compress-force=zlib iostat -x 1 tells me what util of btrfs partition is from 50% to ~90% all the time. Btrfs partition is near full: Size Used Avail Use% 28T 26T 2.1T 93% I don`t use snapshots/subvolumes at this time so none. -- Best regards, Proskurin Kirill