From: ebiederm@xmission.com (Eric W. Biederman)
To: Andi Kleen <ak@suse.de>
Cc: Jamie Lokier <jamie@shareable.org>,
Dave Jones <davej@codemonkey.org.uk>,
"Martin J. Bligh" <mbligh@aracnet.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
Date: 12 Feb 2003 22:17:21 -0700 [thread overview]
Message-ID: <m1of5gwyhq.fsf@frodo.biederman.org> (raw)
In-Reply-To: <20030212104508.GA1273@wotan.suse.de>
Andi Kleen <ak@suse.de> writes:
> On Wed, Feb 12, 2003 at 10:27:41AM +0000, Jamie Lokier wrote:
> > Andi Kleen wrote:
> > > + /* FIXME should disable preemption here but how can we reenable it? */
> > > +
> > > + enable_sysenter();
> > > +
> >
> > Try this:
>
> [...] I have no real interest in vm86 mode, perhaps one of the people
> interested in dosemu etc. could take care of it. I'm very glad it doesn't
> exist on my main architecture - x86-64 - given how many hacks it needs to be
> supported.
There is certainly some old cruft in there, but...
I have been thinking evil thoughts lately about what it would take
to implement on x86-64.
Switching in and out of long mode is evil enough that I don't think it
is worth it. And encouraging people to write good JIT compiling
emulators sounds much better, especially in the long run. But it can
be written.
Eric
next prev parent reply other threads:[~2003-02-13 5:08 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-12 1:35 [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) Martin J. Bligh
2003-02-12 2:59 ` Dave Jones
2003-02-12 4:21 ` Jamie Lokier
2003-02-12 5:49 ` Linus Torvalds
2003-02-12 10:12 ` Jamie Lokier
2003-03-10 3:07 ` Linus Torvalds
2003-03-10 11:06 ` Andi Kleen
2003-03-10 18:33 ` Linus Torvalds
2003-03-10 22:44 ` Linus Torvalds
2003-02-12 12:54 ` Dave Jones
2003-02-12 7:50 ` Andi Kleen
2003-02-12 10:27 ` Jamie Lokier
2003-02-12 10:45 ` Andi Kleen
2003-02-12 17:52 ` Ingo Oeser
2003-02-12 18:13 ` Dave Jones
2003-02-12 18:18 ` Andi Kleen
2003-02-13 2:42 ` Alan Cox
2003-02-13 5:17 ` Eric W. Biederman [this message]
2003-02-13 18:07 ` Andi Kleen
2003-02-14 0:14 ` [discuss] " Peter Tattam
2003-02-14 1:29 ` Andi Kleen
2003-02-14 1:51 ` Eric Northup
2003-02-14 2:01 ` Peter Tattam
2003-02-14 4:07 ` Thomas J. Merritt
2003-02-14 9:38 ` Peter Finderup Lund
2003-02-14 8:27 ` Eric W. Biederman
2003-03-19 1:22 ` Rob Landley
2003-02-12 4:18 ` Jamie Lokier
2003-02-12 5:54 ` Linus Torvalds
2003-02-12 10:18 ` Jamie Lokier
2003-02-12 17:24 ` Linus Torvalds
2003-03-18 15:24 ` Kevin Pedretti
2003-03-18 16:41 ` Linus Torvalds
2003-03-18 18:30 ` Brian Gerst
2003-03-18 19:14 ` Thomas Molina
2003-03-18 19:21 ` Linus Torvalds
2003-03-18 20:03 ` Thomas Schlichter
2003-03-18 20:24 ` Steven Cole
2003-03-19 0:42 ` H. Peter Anvin
2003-03-19 2:22 ` george anzinger
[not found] <20030318165013$55f4@gated-at.bofh.it>
[not found] ` <20030318184010$6448@gated-at.bofh.it>
2003-03-18 20:19 ` Pascal Schmidt
-- strict thread matches above, loose matches on Subject: below --
2003-03-19 9:55 Ph. Marek
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