[OpenAFS-devel] fileserver parameters

[Roland Kuhn]

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Dear experts!

We are fighting with the fileserver performance since a long time.  
Once I got the advice to use the single threaded fileserver, which  
helped, but didn't get me more than 10MB/s. Now we upgraded to Debian  
sarge (openafs 1.3.81), which comes again with the threaded server.  
With default settings we get 1MB/s (the underlying RAID can easily  
deliver >200MB/s, which shows that the VM settings are okay). Now I  
tried with -L -vc 10000 -cb 100000 -udpsize 12800, which brings it  
back to about 6MB/s (all numbers with >>1 simultanous clients  
reading). This is still a factor 30 below the capabilities of the  
RAID (okay, we only have 1GB/s ethernet ;-) ). I've seen excessive  
context switch rates (>>100000/s), which obviously don't happen with  
the single threaded fileserver.

So, can anybody comment on these numbers? Those are dual Opteron  
boxes with enough RAM, so please make some suggestions what options I  
should try to get more like the real performance of a fileserver...

Ciao,
                     Roland

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