Re: [PATCH] page coloring for 2.5.59 kernel, version 1

William Lee Irwin III
2003-01-28T07:13:13Z

At some point in the past, Jason P. wrote:
>> This is yet another holding action, a port of my page coloring patch
>> to the 2.5 kernel. This is a minimal port (x86 only) intended to get
>> some testing done; once again the algorithm used is the same as in
>> previous patches. There are several cleanups and removed 2.4-isms that
>> make the code somewhat more compact, though.
>> I'll be experimenting with other coloring schemes later this week.
>> www.boo.net/~jasonp/page_color-2.5.59-20030127.patch
>> Feedback of any sort welcome.

On Mon, Jan 27, 2003 at 10:58:53PM -0800, Martin J. Bligh wrote:
> I took a 16-way NUMA-Q (700MHz P3 Xeon's w/2MB L2 cache) and ran some
> cpu-intensive benchmarks (kernel compile on warm cache with -j32 and
> -j 256, SDET 1 - 128 users, and numaschedbench with 1 to 64 processes,
> which is a memory thrasher to test node affinity of memory operations),
> and compared to virgin 2.5.59 - no measurable difference on any test.

I think this one really needs to be done with the userspace cache
thrashing microbenchmarks. I also have rather serious reservations
about the interaction of the qlists with the per-cpu lists.

-- wli