Messages in this thread | | | Date | Thu, 11 Sep 2003 18:48:39 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata |
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Andi Kleen wrote: > signal exception path is thousands of cycles, we're talking about tens > of cycles here.
<hand-waving>
Tens vs thousands == percentage points.
Isn't it about 20 cycles per mispredicted branch on a P4?
Five of those and we're talking several percent slowdown, ridiculous as it seems.
</hand-waving>
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