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To: Linus Torvalds <torvalds@transmeta.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] syscall latency improvement #1
In-Reply-To: <18993.1011984842@warthog.cambridge.redhat.com.suse.lists.linux.kernel> <Pine.LNX.4.33.0201251626490.2042-100000@penguin.transmeta.com.suse.lists.linux.kernel>
From: Andi Kleen <ak@suse.de>
Date: 26 Jan 2002 02:24:16 +0100
In-Reply-To: Linus Torvalds's message of "26 Jan 2002 01:56:44 +0100"
Message-ID: <p73y9il7vlr.fsf@oldwotan.suse.de>
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Linus Torvalds <torvalds@transmeta.com> writes:

> Looking at the code, I suspect that 99.9% of this "improvement" comes from
> one thing, and one thing only: you removed the "cli" in the system call
> return path.

It doesn't explain the Athlon speedups. On athlon cli is ~4 cycles. 

-Andi
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