performance of cache-intensive applications

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Hi,

I am using an open-source application on ix86 to perform a task which
is cache-intensive. When I run consecutive iterations of the task on
a fixed input, the variance in timing of each iteration is extemely
high. Needless to say, the test machine is always non-occupied.

On every other OS I tried, Solaris, HPUX, FreeBSD and Tru64, the
timing is very consistent between the iterations. My question is, are
there known issues with L2 cache reuse in Linux kernel?

I can provide any necessary information for anyone interested in
addressing this issue, but I purposely skipped most technical details
in this post to keep it simple.

Thanks in advance.

Igor

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