Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH] i386-pda UP optimization | Date | Wed, 15 Nov 2006 12:32:31 +0100 |
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On Wednesday 15 November 2006 12:27, Eric Dumazet wrote: > Seeing %gs prefixes used now by i386 port, I recalled seeing strange oprofile > results on Opteron machines. > > I really think %gs prefixes can be expensive in some (most ?) cases, even if > the Intel/AMD docs say they are free.
They aren't free, just very cheap.
> > With the attached patch, I got 12.212 s, and a kernel text size reduction of > 3400 bytes.
Are the benchmark numbers stable? i.e. if you repeat them multiple times with reboots do you still get the same difference?
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