From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Sanders Subject: Re: Btrfs switches to using mostly one thread Date: Thu, 08 Dec 2011 17:39:16 +0000 Message-ID: <4EE0F644.6000204@jeremysanders.net> References: <20111208153201.GJ8971@shiny> <4EE0EC68.6040505@jeremysanders.net> <20111208172316.GP8971@shiny> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed To: Chris Mason , linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <20111208172316.GP8971@shiny> List-ID: On 08/12/11 17:23, Chris Mason wrote: > On Thu, Dec 08, 2011 at 04:57:12PM +0000, Jeremy Sanders wrote: >> On 08/12/11 15:32, Chris Mason wrote: >>> On Thu, Dec 08, 2011 at 03:19:38PM +0000, Jeremy Sanders wrote: >>>> Hi - I'm trying out btrfs again, and I see the same old bug in kernel 3.1.4 >>>> (Fedora 16, x86_64, dual-core), where after a few hours of writing, it >>>> switches from writing with several threads to writing with one: >>> >>> Ok, I'll try to reproduce this here. Could you please do a sysrq-t, I'd >>> like to see what the other delalloc-writers are doing. >> >> I've attached sysrq-t. It looks like it might be truncated at the >> beginning, however. > > /var/log/messages may have the whole thing, please do check. That was from /var/log/messages. I think it needs a longer log_buf_len. Unfortunately the system hasn't come back from its reboot, so it will have to wait until tomorrow when I can get to it physically. Jeremy