Greetings,
A machine that I hold very close under my wing has been very contently
chugging along for the last few months with practically no idle processor.
However, I noticed that the CPUs are spinning a lot of cycles in the
system area.
CPU states: 5.5% user, 0.0% nice, 88.9% system, 4.0% interrupt, 1.6% idle
First, some background.
The machine is a Dual P2-450 with 1GB of RAM. It runs apache, and currently
handles 90 hits a second, with each of those hits spawning various CGIs
(one per hit) that completes in under a second.
My first theory was that the kernel was uselessly spinning in various record
locks via fcntl(). However, as a test I removed all file locking from the
various CGIs and noticed no change in the system usage. My second theory
was the overhead with the SMP code. So, I removed it from the kernel and
ran a single CPU box for a few minutes. The system usage went down to
around 60%, but the system was noticeably slower.
Any ideas?
Regards,
Dan
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