kern/131360: [nfs] poor scaling behavior of the NFS server under load

Martin Birgmeier martin at
Sat Feb 28 00:20:04 PST 2009

The following reply was made to PR kern/131360; it has been noted by GNATS.

From: Martin Birgmeier <martin at>
To: bug-followup at
Subject: Re: kern/131360: [nfs] poor scaling behavior of the NFS server under load
Date: Sat, 28 Feb 2009 09:16:44 +0100 (CET)

 To add to what Peter Keel is writing: My kernels *did* still use
 the 4BSD scheduler, so I am quite sure that Peter will not see an
 improvement when switching to it from the ULE scheduler.
 Next observation: My server, aside from serving NFS, is also serving
 samba clients. Yesterday, from a single Windows 98 host, a directory
 on the server containing approx. 100 files was deleted. During this
 time, the server was completely unresponsive (except that I could
 still ping it). It was not even possible to contact the DNS server
 running on it.
 After a few minutes (and presumably when the Windows 98 host was
 finished deleting the directory, I did not watch this directly),
 things returned to normal. However, the "xload" display from the
 server then refreshed again and indicated a truly gigantic load
 peak - it must have been greater than 50 as the background of the
 xload window was completely filled with y axis lines (the horizontal
 lines dividing load levels).
 Something has been messed up horribly with multiprocessing on 7.1.

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