Re: Intel P6 vs P7 system call performance

From: Dave Jones (
Date: Mon Dec 09 2002 - 14:36:49 EST

On Mon, Dec 09, 2002 at 05:48:45PM +0000, Linus Torvalds wrote:

> P4's really suck at system calls. A 2.8GHz P4 does a simple system call
> a lot _slower_ than a 500MHz PIII.
> The P4 has problems with some other things too, but the "int + iret"
> instruction combination is absolutely the worst I've seen. A 1.2GHz
> Athlon will be 5-10 times faster than the fastest P4 on system call
> overhead.

Time to look into an alternative like SYSCALL perhaps ?


| Dave Jones.
| SuSE Labs
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