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List:       linux-kernel
Subject:    Re: [patch] fastcall-2.3.32-B6, SYSENTER/SYSEXIT support
From:       Linus Torvalds <torvalds () transmeta ! com>
Date:       1999-12-14 18:45:33
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On Sun, 12 Dec 1999, Pavel Machek wrote:
> > 
> > Who cares how fast you can do "getpid()"? NOBODY. It's meaningless.
> 
> Well, read from cached file is _not_ meaningless, still Ingo seen
> improvements on that.

Not really.

You see improvements on the order of a percent or two IFF:
 - you do small reads
 - in a tight loop

Ergo, that benchmark was really not worth it either.

> I think you should concentrate on read(), write() and select()
> syscalls. Those are the ones done often.

I mostly agree, although gettimeofday() under X is actually _the_ most
common one. But gettimeofday() is special anyway, simply because it
doesn't actually need to do a kernel entry, so the three you mention are
certainly "basic".

		Linus


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