Messages in this thread | | | Date | Thu, 06 Nov 2003 10:16:20 +1100 | From | Nick Piggin <> | Subject | Re: lmbench context switch regression |
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Nick Piggin wrote:
> Hi, > I'm seeing quite a large context switch speed regression as reported > by lmbench when I patched from test9 to test9-mm2. > > The obvious thing I can see from the patch is the PF_DEAD > finish_task_switch > change. I don't have time to investigate further tonight though. > > lmbench two 0 sized processes context switch times go from around > 1.80us to > 2.60us on my PIII 650 (UP).
The regression is smaller when going from test9 to test9-bk. About .2us (10%). It does not go away when reverting the PF_DEAD change. Maybe its just lucky alignment?
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