From: Pavel Machek <pavel@suse.cz>
To: Alok Kataria <akataria@vmware.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
LKML <linux-kernel@vger.kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Daniel Hecht <dhecht@vmware.com>
Subject: Re: [PATCH 0/3] Improve TSC as a clocksource under VMware
Date: Tue, 21 Oct 2008 20:36:34 +0200 [thread overview]
Message-ID: <20081021183634.GA1475@ucw.cz> (raw)
In-Reply-To: <1224607688.6161.25.camel@alok-dev1>
On Tue 2008-10-21 09:48:08, Alok Kataria wrote:
> On Tue, 2008-10-21 at 02:50 -0700, Pavel Machek wrote:
> > > Hi,
> > >
> > > This patch set makes some changes to the TSC code, so that it is always
> > > used as the default clocksource when running under VMware.
> > > The first 2 patches do the ground work of adding code to detect if we
> > > are running under VMware.
> > > The third patch adds a tsc_reliable flag which tells us that TSC is
> > > reliable on this system, so that we can skip some tests which can
> > > potentially mark TSC as unstable. Details under individual patch
> > > headers.
> >
> > How do you _know_ TSC is stable under VMWare?
>
> Since we implement it that way :)
> The hypervisor takes care of providing a constant rate TSC to the guest
> on such systems which have variable frequency.
Aha, so tsc accesses trap to VMWare? Ok, then...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2008-10-21 18:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 1:35 [PATCH 0/3] Improve TSC as a clocksource under VMware Alok Kataria
2008-10-21 5:55 ` Chris Snook
2008-10-21 19:11 ` Alok Kataria
2008-10-22 19:26 ` Alok Kataria
2008-10-22 19:29 ` Jeff Hansen
2008-10-21 9:43 ` Andi Kleen
2008-10-21 16:41 ` Alok Kataria
2008-10-21 17:40 ` Andi Kleen
2008-10-21 18:04 ` Alok Kataria
2008-10-21 18:15 ` Andi Kleen
2008-10-21 19:10 ` Alok Kataria
2008-10-21 19:27 ` Andi Kleen
2008-10-21 19:47 ` Alok Kataria
2008-10-21 21:41 ` Alok Kataria
2008-10-22 19:23 ` [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is set Alok Kataria
2008-10-22 19:26 ` Ingo Molnar
2008-10-22 19:30 ` Alok Kataria
2008-10-22 20:17 ` Andi Kleen
2008-10-22 22:04 ` Alok Kataria
2008-10-22 19:58 ` Andi Kleen
2008-10-22 22:00 ` Alok Kataria
2008-10-22 22:13 ` Andi Kleen
2008-10-22 22:11 ` Alok Kataria
2008-10-22 22:54 ` Andi Kleen
2008-10-23 2:21 ` Alok Kataria
2008-10-23 8:10 ` Andi Kleen
2008-10-23 23:39 ` Alok Kataria
2008-10-23 23:47 ` H. Peter Anvin
2008-10-24 0:25 ` Andi Kleen
2008-10-24 0:46 ` H. Peter Anvin
2008-10-24 7:23 ` Andi Kleen
2008-10-24 15:30 ` H. Peter Anvin
2008-10-24 19:25 ` Andi Kleen
2008-10-24 19:19 ` H. Peter Anvin
2008-10-24 19:34 ` Andi Kleen
2008-10-24 19:50 ` Alok Kataria
2008-10-24 20:18 ` Dan Hecht
2008-10-24 1:12 ` Alok Kataria
2008-10-24 1:18 ` H. Peter Anvin
2008-10-22 22:15 ` Alan Cox
2008-10-22 22:17 ` Alok Kataria
2008-10-21 9:50 ` [PATCH 0/3] Improve TSC as a clocksource under VMware Pavel Machek
2008-10-21 16:48 ` Alok Kataria
2008-10-21 18:36 ` Pavel Machek [this message]
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