* Nick Piggin ([EMAIL PROTECTED]) wrote:
> Mathieu Desnoyers wrote:
>
> >I tried it with and without the LOCK prefix on my Pentium 4.
> >
> >Locked cmpxchg8b : 90 cycles
> >Non locked cmpxchg8b: 30 cycles
> >sti: 166 cycles
> >cli: 159 cycles
> >
> >So, hrm, even if we use the locked version, it
Mathieu Desnoyers wrote:
I tried it with and without the LOCK prefix on my Pentium 4.
Locked cmpxchg8b : 90 cycles
Non locked cmpxchg8b: 30 cycles
sti: 166 cycles
cli: 159 cycles
So, hrm, even if we use the locked version, it is still much faster than
the sti/cli. I am thoughtful about the
* Mathieu Desnoyers ([EMAIL PROTECTED]) wrote:
> I just want to rectify a detail: local_t uses type "long", which is 32
> bits on x86_32 and 64 bits on x86_64.
>
> Using a cmpxchg8b on i386 seems to require the LOCK prefix to be taken,
> so it may degrate performances too much. Therefore, you
* Mathieu Desnoyers ([EMAIL PROTECTED]) wrote:
I just want to rectify a detail: local_t uses type long, which is 32
bits on x86_32 and 64 bits on x86_64.
Using a cmpxchg8b on i386 seems to require the LOCK prefix to be taken,
so it may degrate performances too much. Therefore, you may
Mathieu Desnoyers wrote:
I tried it with and without the LOCK prefix on my Pentium 4.
Locked cmpxchg8b : 90 cycles
Non locked cmpxchg8b: 30 cycles
sti: 166 cycles
cli: 159 cycles
So, hrm, even if we use the locked version, it is still much faster than
the sti/cli. I am thoughtful about the
* Nick Piggin ([EMAIL PROTECTED]) wrote:
Mathieu Desnoyers wrote:
I tried it with and without the LOCK prefix on my Pentium 4.
Locked cmpxchg8b : 90 cycles
Non locked cmpxchg8b: 30 cycles
sti: 166 cycles
cli: 159 cycles
So, hrm, even if we use the locked version, it is still much
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