[ sigh, adding back original reporter. Oops. -- rbl ] Priyank Patel, please see Trond's response below and try out the suggested patch linked below. On Tue, Dec 9, 2008 at 5:06 PM, Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote: > 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 linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
