Re: 2.6.4-mm2
From: Nick Piggin (piggin_at_cyberone.com.au)
Date: 03/20/04
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Date: Sat, 20 Mar 2004 14:52:35 +1100 To: Mark Wong <markw@osdl.org>
Mark Wong wrote:
>On Fri, Mar 19, 2004 at 06:50:26PM -0800, Andrew Morton wrote:
>
>>Mark Wong <markw@osdl.org> wrote:
>>
>>>On Thu, Mar 18, 2004 at 07:41:50PM -0800, Andrew Morton wrote:
>>>
>>>>Andrew Morton <akpm@osdl.org> wrote:
>>>>
>>>>>Mark, if it's OK I'll run up some kernels for you to test.
>>>>>
>>>>At
>>>>
>>>> http://www.zip.com.au/~akpm/linux/patches/markw/
>>>>
>>>Ok, looks like I take the first hit with the 02 patch. Here's re-summary:
>>>
>>>kernel 16 kb 32 kb 64 kb 128 kb 256 kb 512 kb
>>>2.6.3 2308 2335 2348 2334
>>>2.6.4-mm2 2028 2048 2074 2096 2082 2078
>>>2.6.5-rc1-01 2394
>>>2.6.5-rc1-02 2117
>>>2.6.5-rc1-mm2 2036
>>>
>>Thanks, so it's the CPU scheduler changes. Is that machine hyperthreaded?
>>And do you have CONFIG_X86_HT enabled?
>>
>
>Yes and CONFIG_X86_HT is enabled but I have hyperthreading disabled with
>'acpi=off noht' (whichever one does it.)
>
The oprofile for the 01 kernel says
CPU: P4 / Xeon, speed 1497.76 MHz (estimated)
while the 02 kernel says
CPU: P4 / Xeon with 2 hyper-threads, speed 1497.57 MHz (estimated)
What's going on there?
Other than that, nothing in the kernel profile jumps out at me:
schedule, __copy_from_user_ll and __copy_to_user_ll are all
significantly lower *after* the CPU scheduler changes, which
is an indicator that cache behaviour is better.
Sar says average context switches/second were 9064 and 6567 before
and after.
The only thing I can see is the CPU utilisation averages show the
scheduler patches have more of a tendancy to load up one CPU more
before moving to another. This actually should be good behaviour,
generally but I wonder if it is hurting at all. I would be really
surprised if it was that significant.
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- Previous message: Linus Torvalds: "Linux 2.6.5-rc2"
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