On Mon, 2007-06-18 at 22:12 -0700, Vernon Mauery wrote:
> In looking at the performance characteristics of my network I found that
> 2.6.21.5-rt15 suffers from degraded thoughput with multiple threads. The
> test that I did this with is simply invoking 1, 2, 4, and 8 instances of
> netperf at a time and measuring the total throughput. I have two 4-way
> machines connected with 10GbE cards. I tested several kernels (some older
> and some newer) and found that the only thing in common was that with -RT
> kernels the performance went down with concurrent streams.
>
> While the test was showing the numbers for receiving as well as sending, the
> receiving numbers are not reliable because that machine was running a -RT
> kernel for these tests.
>
> I was just wondering if anyone had seen this problem before or would have any
> idea on where to start hunting for the solution.
could you enable CONFIG_LOCK_STAT
echo 0 > /proc/lock_stat
<run your test>
and report the output of (preferably not 80 column wrapped):
grep : /proc/lock_stat | head
or otherwise if there are any highly contended network locks listed?
- Peter
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