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
--
TU Muenchen, Physik-Department E18, James-Franck-Str. 85747 Garching
Telefon 089/289-12592; Telefax 089/289-12570
--
A mouse is a device used to point at
the xterm you want to type in.
Kim Alm on a.s.r.
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GS/CS/M/MU d-(++) s:+ a-> C+++ UL++++ P-(+) L+++ E(+) W+ !N K- w--- M
+ !V Y+
PGP++ t+(++) 5 R+ tv-- b+ DI++ e+++>++++ h---- y+++ ------END GEEK CODE BLOCK------
PGP.sig
Description: This is a digitally signed message part
