lkml.org 
[lkml]   [2007]   [Nov]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Massive slowdown when re-querying large nfs dir
> On Tue, 6 Nov 2007 14:28:11 +0300 Al Boldi <a1426z@gawab.com> wrote:
> 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?
>

Sure, Neil can! ;)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-11-07 07:23    [W:0.098 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site