Date: Sun, 8 Feb 2009 08:20:03 GMT From: Martin Birgmeier <martin@email.aon.at> To: freebsd-fs@FreeBSD.org Subject: Re: kern/131360: [nfs] poor scaling behavior of the NFS server under load Message-ID: <200902080820.n188K3st052428@freefall.freebsd.org>
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The following reply was made to PR kern/131360; it has been noted by GNATS.
From: Martin Birgmeier <martin@email.aon.at>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: kern/131360: [nfs] poor scaling behavior of the NFS server under load
Date: Sun, 8 Feb 2009 09:12:46 +0100 (CET)
Another top snapshot on the server, scenario is the following:
- make -j4 buildworld running on the client, currently in
"===> kerberos5/lib/libkadm5srv (all)"
- on the server, in addition to serving NFS, also running
a 'svn log' command, where the repository is also served
by the server via http (httpd, subversion repo, and svn log
all running on the server, displaying in an XTerm running
on the client).
If I do the 'svn log' without NFS load from the client (buildworld
stopped), there is nearly instantaneous output. If I do it with a
running buildworld on the client, I get the a top output similar
to the one below (actually, it is very hard to capture the "worst"
moments, as the server is so unresponsive - in fact the load was
something like 25, and each of the 8 nfsds consumed about 10% of
CPU).
last pid: 2527; load averages: 14.71, 10.36, 6.13 up 0+01:04:43 08:21:08
111 processes: 9 running, 102 sleeping
CPU: 1.4% user, 0.0% nice, 90.5% system, 8.1% interrupt, 0.0% idle
Mem: 135M Active, 745M Inact, 119M Wired, 1012K Cache, 112M Buf, 248M Free
Swap: 2048M Total, 2048M Free
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
971 root 1 4 0 3128K 944K - 13:45 40.28% nfsd
972 root 1 4 0 3128K 944K - 2:19 15.09% nfsd
973 root 1 4 0 3128K 944K - 1:31 10.16% nfsd
974 root 1 4 0 3128K 944K - 1:03 6.05% nfsd
975 root 1 4 0 3128K 944K - 0:49 4.59% nfsd
977 root 1 4 0 3128K 944K - 0:41 3.56% nfsd
978 root 1 4 0 3128K 944K - 0:35 2.64% nfsd
976 root 1 4 0 3128K 944K - 0:31 1.81% nfsd
2527 root 1 96 0 3164K 992K RUN 0:00 1.54% rsh
1471 root 1 81 -15 5032K 2716K select 0:05 0.05% ppp
919 root 1 96 0 3128K 3148K select 2:16 0.00% amd
1539 root 1 96 0 6508K 4964K RUN 0:10 0.00% xterm
1140 squid 1 4 0 12000K 10152K sbwait 0:05 0.00% perl5.8.9
1130 squid 1 96 0 15660K 10820K RUN 0:05 0.00% squid
1141 squid 1 4 0 12000K 10148K sbwait 0:04 0.00% perl5.8.9
1142 squid 1 4 0 12000K 10148K sbwait 0:04 0.00% perl5.8.9
1143 squid 1 4 0 12000K 10104K sbwait 0:03 0.00% perl5.8.9
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