kern/131360: [nfs] poor scaling behavior of the NFS server
under load
Martin Birgmeier
martin at email.aon.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 email.aon.at>
To: bug-followup at FreeBSD.org
Cc:
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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