Messages in this thread | | | Date | Thu, 7 Apr 2005 17:28:32 +0200 | From | Jakob Oestergaard <> | Subject | Re: bdflush/rpciod high CPU utilization, profile does not make sense |
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On Wed, Apr 06, 2005 at 05:28:56PM -0400, Trond Myklebust wrote: ... > A look at "nfsstat" might help, as might "netstat -s". > > In particular, I suggest looking at the "retrans" counter in nfsstat.
When doing a 'cp largefile1 largefile2' on the client, I see approx. 10 retransmissions per second in nfsstat.
I don't really know if this is a lot...
I also see packets dropped in ifconfig - approx. 10 per second... I wonder if these two are related.
Client has an intel e1000 card - I just set the RX ring buffer to the max. of 4096 (up from the default of 256), but this doesn't seem to help a lot (I see the 10 drops/sec with the large RX buffer).
I use NAPI - is there anything else I can do to make the card not drop packets? I'm just assuming that this might at least be a part of the problem, but with large RX ring and NAPI I don't know how much else I can do to not make the box drop incoming data...
> When you say that TCP did not help, please note that if retrans is high, > then using TCP with a large value for timeo (for instance -otimeo=600) > is a good idea. It is IMHO a bug for the "mount" program to be setting > default timeout values of less than 30 seconds when using TCP.
I can try that.
Thanks!
--
/ jakob
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