From owner-freebsd-bugs  Tue Mar 26 10:20:16 2002
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From: Alexander Haderer <alexander.haderer@charite.de>
Subject: Re: misc/35151: High NFSD load in FreeBSD 4.5R
Reply-To: Alexander Haderer <alexander.haderer@charite.de>
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The following reply was made to PR misc/35151; it has been noted by GNATS.

From: Alexander Haderer <alexander.haderer@charite.de>
To: freebsd-gnats-submit@FreeBSD.org, anderson@centtech.com
Cc: dirk.emmel@charite.de
Subject: Re: misc/35151: High NFSD load in FreeBSD 4.5R
Date: Tue, 26 Mar 2002 19:14:05 +0100

 hello,
 
 we had the same problem with 4.5R. The NFS server exports a 450 GB vinum=20
 RAID to other clients which usually do write access via NFS (read access is=
 =20
 local). When the filesystem has become more and more full (70% ...) one or=
 =20
 more nfsd's eat up the CPU when writing to the NFS server: After NFS=20
 writing of some megabytes (dirs, hundreds of files) via NFS, top shows nfsd=
 =20
 with >100% WCPU, system above 70% and a load average > 10 with very slow=20
 reactions of the machine (obviously). The usual load is somewhere between=20
 0.1 .. 2.0 resulting from some httpds.
 
 The high load went back to acceptable values when we disabled the=20
 softupdates for the exported filesystem: tunefs -n disable /dev/vinum/raid.
 
 If this is a bug or a feature: I don't know.
 
 Alexander
 --=20
 Alexander Haderer             Charit=E9 Berlin - Germany
 

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