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From Brian Pane <>
Subject Re: 2.0.29 high load avg
Date Wed, 09 Jan 2002 18:46:16 GMT
Can someone describe what the difference is between the select/accept/mutex
behavior of .28 and .29/.30 on daedalus?

Also, do we have any data on syscalls per request during the spikes?
Based on Greg's vmstat data showing a spike in syscalls/second concurrent
with the spike in load, I'd
expect that either:
  * The number of requests/second increased, or
  * The number of syscalls/request increased

I'd originally assumed it was the latter (e.g., because some request type
started doing more syscalls in .29 than in .28), but I can't yet identify
evidence of this in the data.


Sander Temme wrote:

>>the point is I don't see the high load average.
>If we're actually looking at a problem with select()/accept() and the
>presence or absence of a mutex, I would not be surprised if Solaris and BSD
>react differently. See my December paper
>For a look at the differences between Solaris and Linux. Now, Linux ain't
>BSD, so it's possible that it does something else yet again.

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