[OpenAFS] namei/inode fileserver performance tests

[Rainer Toebbicke]

Neulinger, Nathan wrote:
> Ick. Makes me wonder if it might be worthwhile to try and make a
> fileserver/volserver that could hook into reiserfs/reiser4 directly for
> it's file store to get good linux performance. (Although namei probably
> suffers less of a performance hit on linux filesystems than solaris.
> 

A while ago I 'strace -T'-ed a linux fileserver during a performance test and 
was surprised to find out that it spent over 30% of its elapsed time in 
fsync(). That was RH 7 kernel unknown Openafs 1.2.3.

For the fileserver alone fsync() doesn't make much sense (at least not at high 
frequency, unless I misunderstand the odd Linux pthread implementation), so I 
wonder whether files accessed by the volserver (if that is the reason for the 
frequent fsyncing) couldn't be secured by other means.

-- 
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Rainer Toebbicke        http://cern.ch/~rtb         rtb@mail.cern.ch  O__
European Laboratory for Particle Physics(CERN) - Geneva, Switzerland   > |
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