Messages in this thread | | | Date | Wed, 31 Mar 2010 10:21:07 -0400 | From | Chuck Lever <> | Subject | Re: [2.6.34-rc2 NFS4 oops] open error path failure... |
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On 03/31/2010 07:20 AM, Daniel J Blueman wrote: > Talking of expensive, I see latencytop show>16000ms latency for > writing pages when I have a workload that does large buffered I/O to > an otherwise uncongested server. The gigabit network is saturated, and > reads often stall for 1000-4000ms (!). Client has the default 16 TCP > request slots, and server has 8 nfsds - the server is far from disk or > processor-saturated. I'll see if there is any useful debugging I can > get about this.
That latency is pretty much guaranteed to be due to a long RPC backlog queue on the client. Bumping the size of the slot table to 128 and increasing the number of NFSD threads may help.
-- chuck[dot]lever[at]oracle[dot]com
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