Re: RH 7.3 kernels and NFS performance

[Tom McNeal <trmcneal@attbi.com>]

Rex Dieter wrote:
> 
> On Wed, 7 Aug 2002, Trond Myklebust wrote:
> 
> >
> > If you are getting that performance with v3, then it does indeed sound
> > like a bug somewhere. Try with a stock 2.4.19 kernel instead...
> 
> I just tested things with a test kernel (2.4.18-7) from redhat, and it
> sync write speeds were again way up there.  Problem fixed, as far as I'm
> concerned... hopefully, they'll release an errata soon.
> 
> --
> Rex A. Dieter                   rdieter@unl.edu
> Computer System Administrator   http://www.math.unl.edu/~rdieter/
> Mathematics and Statistics
> University of Nebraska Lincoln

and

"Lever, Charles" wrote:
> 
> hi jeff-
> 
> >    I remember reading on the list about the terrible NFS
> > performance of the latest RH kernels. Would someone
> > care to summarize this for me (UDP or TCP, etc.)? Also,
> > does anyone have any rough estimates of the performance
> > hit?
> 
> if you are referring to bad NFS client performance, this
> is due to a bug in the Linux IP fragmentation logic which
> causes it to send part of a fragmented packet, and drop
> the rest, if it runs out of socket buffer space during
> the fragmentation process.
> 
> thus it only affects NFS over UDP.
> 
> there is an easy workaround:  enlarge the size of the
> RPC transport socket's buffers.  see the NFS FAQ for
> instructions.
> 
> a bug was reported in the eepro100 driver too, and that
> may have some effect on client performance.
> 

So if this is one and the same bug, then enlarging the transport
socket size is actually discussed in the performance section
of the howto documents (section 5.7) at 
http://nfs.sourceforge.net/nfs-howto/performance.html#MEMLIMITS

Tom
--
------------------------------------------------------------
Tom McNeal       trmcneal@attbi.com     (650)906-0761 (cell) 
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