Re: high latency NFS

[J. Bruce Fields]

On Fri, Aug 01, 2008 at 05:23:20PM +1000, Dave Chinner wrote:
> Having implemented the second option on a different NUMA aware
> OS and NFS server, I can say that it isn't that complex, nor that
> hard to screw up.
> 
> 	1. spawn a new thread only if all NFSDs are busy and there
> 	   are still requests queued to be serviced.
> 	2. rate limit the speed at which you spawn new NFSD threads.
> 	   About 5/s per node was about right.
> 	3. define an idle time for each thread before they
> 	   terminate. That is, is a thread has not been asked to
> 	   do any work for 30s, exit.
> 	4. use the NFSD thread pools to allow per-pool independence.

Actually, I lost you on #4.  You mean that you apply 1-3 independently
on each thread pool?  Or something else?

--b.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/