From: Andi Kleen <andi@firstfloor.org>
To: akataria@vmware.com
Cc: "H. Peter Anvin" <hpa@zytor.com>,
LKML <linux-kernel@vger.kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Dan Hecht <dhecht@vmware.com>
Subject: Re: [PATCH 0/3] Improve TSC as a clocksource under VMware
Date: Tue, 21 Oct 2008 11:43:30 +0200 [thread overview]
Message-ID: <874p36fflp.fsf@basil.nowhere.org> (raw)
In-Reply-To: <1224552902.2640.88.camel@alok-dev1> (Alok Kataria's message of "Mon, 20 Oct 2008 18:35:02 -0700")
Alok Kataria <akataria@vmware.com> writes:
> This patch set makes some changes to the TSC code, so that it is always
> used as the default clocksource when running under VMware.
Does this imply that vmware always emulates TSC reads?
Or how do you guarantee reliable TSC on a system where the underlying
TSC isn't?
It would be far nicer if VMware just emulated the "constant_tsc" bit
in the AMD CPUID leaf, instead of adding all that gunk to Linux.
Right now it's only checked for AMD CPUs, but that could be changed.
Otherwise with more and more hypervisors we mind end up with more
and more unscalable detection code.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-10-21 9:43 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 [this message]
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
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