Re: NFS client latencies

Ingo Molnar
2005-03-31T07:58:28Z

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* Ingo Molnar <mingo@elte.hu> wrote:

> could you check the -41-23 -RT kernel at the usual place:
>
> http://redhat.com/~mingo/realtime-preempt/
>
> i've added Trond's radix lookup code, plus the lockbreaker patch.
>
> (one thing that is not covered yet is nfs_scan_list() - that still scans
> a list. Trond, is that fixable too?)

ok, find a new latency trace attached (1.6 msecs). I generated write
loads, and the nfs_scan_list_dirty() latency is gone and indeed
nfs_scan_list() generates the worst latency - while processing 8535
pages in one critical section.

Ingo

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