Re: NFS client latencies

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxx> wrote:

> > So the overhead you are currently seeing should just be that of 
> > iterating through the list, locking said requests and adding them to 
> > our private list.
> 
> ah - cool! This was a 100 MB writeout so having 3.7 msecs to process 
> 20K+ pages is not unreasonable. To break the latency, can i just do a 
> simple lock-break, via the patch below?

with this patch the worst-case latency during NFS writeout is down to 40 
usecs (!).

Lee: i've uploaded the -42-05 release with this patch included - could 
you test it on your (no doubt more complex than mine) NFS setup?

	Ingo
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