Messages in this thread |  | | Date | Tue, 10 Sep 2002 02:06:04 +1000 (EST) | From | James Morris <> | Subject | Re: Performance issue in 2.5.32+ |
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On Sun, 8 Sep 2002, Linus Torvalds wrote:
> I don't really see anythign very suspicious in the 31->32 changelogs. > Somebody else already mentioned TLS etc, but that shouldn't really be > noticeable...
I've now tracked the problem to the introduction of the new mtrr code, and backing it out for 2.5.32 restores original performance. From what I can tell, the new code is not handling a bios/hardware bug that the old code was.
The old mtrr code says this during bootup: mtrr: your CPUs had inconsistent fixed MTRR settings mtrr: your CPUs had inconsistent variable MTRR settings mtrr: probably your BIOS does not setup all CPUs
While the new code just says: mtrr: SMP support incomplete for this vendor
The peformance hit is basically the same as when the old mtrr code is disabled. I'll have a poke around and see if I can find out why the new mtrr code isn't handling the problem.
- James -- James Morris <jmorris@intercode.com.au>
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