From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <ak@muc.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
eich@suse.de
Subject: Re: [patch] context-switching overhead in X, ioport(), 2.6.8.1
Date: Sun, 22 Aug 2004 19:31:28 +0200 [thread overview]
Message-ID: <20040822173128.GA31054@elte.hu> (raw)
In-Reply-To: <20040822142344.GA81458@muc.de>
* Andi Kleen <ak@muc.de> wrote:
> > Xorg and XFree assume the kernel will have intelligent limits. When the
> > range went up the EnableIO code in turn switched to ioperm.
>
> Which was the wrong thing to do since it is slower.
it is not significantly slower with older kernels or with the patch
applied, and it's safer than an all-ports iopl(3).
Ingo
next prev parent reply other threads:[~2004-08-22 17:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2vEzI-Vw-17@gated-at.bofh.it>
2004-08-22 12:16 ` [patch] context-switching overhead in X, ioport(), 2.6.8.1 Andi Kleen
2004-08-22 12:00 ` Alan Cox
2004-08-22 14:23 ` Andi Kleen
2004-08-22 14:47 ` Alan Cox
2004-08-22 17:31 ` Ingo Molnar [this message]
2004-08-21 13:55 Ingo Molnar
2004-08-22 4:46 ` David S. Miller
2004-08-22 5:42 ` Ryan Cumming
2004-08-22 6:00 ` Lee Revell
2004-08-22 6:06 ` Ryan Cumming
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