From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Clayton Subject: Re: RAID 5 performance issue. Date: Fri, 5 Oct 2007 20:33:31 +0100 Message-ID: <20071005203331.68580b8e@alpha.digital-domain.net> References: <20071003105321.06943824@zeus.pccl.info> <20071003211910.439ded54@alpha.digital-domain.net> <72dbd3150710031336s331782c3yd0ac7ceda4e81774@mail.gmail.com> <20071004150831.6edbf926@zeus.pccl.info> <20071004154441.31addcfe@zeus.pccl.info> <20071004192653.25eb333b@alpha.digital-domain.net> <20071005115719.4a71ab89@zeus.pccl.info> <20071005135312.04856211@zeus.pccl.info> <20071005143023.2bce96e9@zeus.pccl.info> <20071005171008.3e8a664d@zeus.pccl.info> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: Andrew Clayton , David Rees , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, 5 Oct 2007 12:16:07 -0400 (EDT), Justin Piszcz wrote: > > Hm, unfortunately at this point I think I am out of ideas you may > need to ask the XFS/linux-raid developers how to run blktrace during > those operations to figure out what is going on. No problem, cheers. > BTW: Last thing I can think of, did you make any changes to > PREEMPTION in the kernel, or do you disable it (SERVER)? I normally have it disabled, but did try with voluntary preemption, but with no effect. > Justin. Andrew