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Problem identified: WAPL/RAIDframe performance problems
> I seem to be facing two problems:
> 1. A certain svn update command is ridicously slow on my to-be file server.
> 2. During the svn update, the machine partially locks up and fails to respond
> to NFS requests.
Thanks to very kind help by hannken@, I now at least know what the problem is.
Short form: WAPBL is currently completely unusable on RAIDframe (I always
suspected something like that), at least on non-Level 0 sets.
The problem turned out to be wapbl_flush() writing non-fsbsize chunks on non-
fsbsize boundaries. So RAIDframe is nearly sure to RMW.
That makes the log being written to disc at about 1MB/s with the write lock
on the log being held. So everything else on that fs tstiles on the log's
Anyone in a position to improve that? I could simply turn off logging, but then
any non-clean shutdown is sure to take ages.
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