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Message-Id: <200711061428.11453.a1426z@gawab.com> Date: Tue, 6 Nov 2007 14:28:11 +0300 From: Al Boldi <a1426z@...ab.com> To: linux-fsdevel@...r.kernel.org Cc: linux-kernel@...r.kernel.org Subject: Re: Massive slowdown when re-querying large nfs dir Al Boldi wrote: > There is a massive (3-18x) slowdown when re-querying a large nfs dir (2k+ > entries) using a simple ls -l. > > On 2.6.23 client and server running userland rpc.nfs.V2: > first try: time -p ls -l <2k+ entry dir> in ~2.5sec > more tries: time -p ls -l <2k+ entry dir> in ~8sec > > first try: time -p ls -l <5k+ entry dir> in ~9sec > more tries: time -p ls -l <5k+ entry dir> in ~180sec > > On 2.6.23 client and 2.4.31 server running userland rpc.nfs.V2: > first try: time -p ls -l <2k+ entry dir> in ~2.5sec > more tries: time -p ls -l <2k+ entry dir> in ~7sec > > first try: time -p ls -l <5k+ entry dir> in ~8sec > more tries: time -p ls -l <5k+ entry dir> in ~43sec > > Remounting the nfs-dir on the client resets the problem. > > Any ideas? Ok, I played some more with this, and it turns out that nfsV3 is a lot faster. But, this does not explain why the 2.4.31 kernel is still over 4-times faster than 2.6.23. Can anybody explain what's going on? Thanks! -- Al - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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