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?
-Andi
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