On Wed, 2004-03-31 at 16:46, Stephen C. Tweedie wrote: > > Now, the setup mostly works fine. But if you actively use the > > filesystem for some time (hour of copying a large tree over NFS), then > > then try 'sync' command, the latter runs very long (10 minutes or more), > > eating 99% CPU according to top, and the system becomes very sluggish > > (leading to stalled replication, heartbeat misbehavior) and in fact > > unusable. > > You'd need to try capturing a profile of the 99% cpu loop for us to be > able to investigate this any further. That'd be tricky: it is somewhere in the kernel (top shows 99% CPU used by "system", and strace attaced to sync does not show anything). Another thing, possibly related: when I try `quotaoff', machine hangs for 10+ minutes, and does not respond to *anything* but ping. Then it gets alive again. I'd be happy to provide more information but so far I cannot decide where to look... Should I learn to use "kernel profiling"? Eugene
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