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Date: Tue, 09 Dec 2008 20:06:45 -0500 From: Trond Myklebust <trond.myklebust@....uio.no> To: Ray Lee <ray-lk@...rabbit.org> Cc: LKML <linux-kernel@...r.kernel.org>, linux-nfs@...r.kernel.org, Netdev <netdev@...r.kernel.org> Subject: Re: Fwd: 2.6.26.3 kernel - progressive slowdown over NFS On Tue, 2008-12-09 at 16:38 -0800, Ray Lee wrote: > [ adding netdev, linux-nfs to cc: -- rbl ] > > Hi, > > > We have a simple python program which keeps running a C loop to lstat > NFS mounted directories. We are seeing some weird behavior w.r.t. the > run-time of this program on 2.6.26.3 kernel vs 2.6.24 kernel. > > The run-time of the following code increases over time on the 2.6.26.3 > kernel, whereas remains flat (as expected) on the 2.6.24 kernel. > [See attached graphs - B1.jpg and B2.jpg] Once the 2.6.26.3 machine > gets into this state, we need to restart the box to get back to > reasonable run-times. Is this a known issue ? Could you try applying the following patch? http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git&a=commitdiff&h=23918b03060f6e572168fdde1798a905679d2e06 Trond PS: note that your 2.6.26 config file has _very_ different memory models and kernel debugging options enabled compared to your 2.6.24 kernel. That may also affect performance. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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