Re: nfs-server slowdown in 2.4.20-pre10 with client 2.2.19

From: Stephan von Krawczynski (
Date: Sun Oct 13 2002 - 21:54:10 EST

On Mon, 14 Oct 2002 09:03:43 +1000
Neil Brown <> wrote:

> On Sunday October 13, wrote:
> > Hello Trond,
> > hello all,
> >
> > just to drop a note: I am experiencing a rather dramatic slowdown of the
> > nfs-server in kernel 2.4.20-pre10 in conjunction with nfs-clients kernel
> > 2.2.19. To be more specific, the server is a SMP machine and runs always the
> > latest 2.4.x kernels. Upto 2.4.20-pre9 everything was quite ok, but pre10
> > brought an incredible loss. The setup did not change, only the kernel on the
> > server side. Merely all nfs action is writing to the server, reading from it is
> > next to zero in this setup.
> Very odd... There were no changes between pre9 and pre10 that
> directly relate to the nfs server, and none that immediately jump out
> at me that could cause a slowdown in NFS writes.
> What architecture? PPC saw a lot of updates.

i386, namely dual PIII 1GHz with 1 GB RAM
Are you sure it has nothing to do with the latest patch and SMP:

Trond Myklebust <>:
  o Workaround NFS hangs introduced in 2.4.20-pre

> What filesystem? jfs saw one change

reiserfs 3.6

> What storage device? IDE or SCSI?

IDE, PDC20268

> Can you try going back to -pre9 and confirm that performance comes
> back?

I will have a second try on the issue this night and be back with info tommorrow.


> NeilBrown

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