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From Brian Pane <brian.p...@cnet.com>
Subject Re: FreeBSD load statistics.
Date Fri, 11 Jan 2002 18:31:13 GMT
Greg Ames wrote:

>>On Wed, Jan 09, 2002 at 11:55:21PM -0800, Brian Pane wrote:
>>
>>>My hypothesis upon seeing these numbers is that the high run queue length
>>>is due to us hitting some bottleneck in the kernel on daedalus--and because
>>>post-2.0.28 releases waste less time in usr-space code between syscalls,
>>>they hit that kernel bottleneck a lot harder than 2.0.28 did.
>>>
>
>An interesting theory.  But it doesn't explain the high numbers of CPU ticks
>I've recorded for trivial requests, nor does it explain the top Brian B sent us
>with two httpd's both using over 50% of the CPU for a while
>

It might explain the high number of CPU ticks for simple requests if
a lot of processes are hitting, say, a spin lock at the same time.  But
the two httpds using 50% of the CPU are definitely something different.

We really need some data on what's happening in those processes on daedalus.

--Brian



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