tech-kern archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: Problem identified: WAPL/RAIDframe performance problems

        Hello.  If running 5.1 or 5.2 is acceptable for you, you could run
ffs+softdep since it has all the namei fixes in it.

On Nov 28,  5:15pm, Edgar =?iso-8859-1?B?RnXf?= wrote:
} Subject: 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 
} >    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 
} read lock.
} Anyone in a position to improve that? I could simply turn off logging, but 
} any non-clean shutdown is sure to take ages.
>-- End of excerpt from Edgar =?iso-8859-1?B?RnXf?=

Home | Main Index | Thread Index | Old Index