From: Ingo Molnar <mingo@elte.hu>
To: Arjan van de Ven <arjan@infradead.org>
Cc: dor.laor@qumranet.com, tglx@linutronix.de,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
kvm-devel <kvm-devel@lists.sourceforge.net>
Subject: Re: Performance overhead of get_cycles_sync
Date: Tue, 11 Dec 2007 18:03:34 +0100 [thread overview]
Message-ID: <20071211170334.GA30144@elte.hu> (raw)
In-Reply-To: <20071211083513.56c2a385@laptopd505.fenrus.org>
* Arjan van de Ven <arjan@infradead.org> wrote:
> > * Dor Laor <dor.laor@gmail.com> wrote:
> >
> > The patch below should resolve this - could you please test and Ack
> > it? But this CPUID was present in v2.6.23 too, so why did it only
> > show up in 2.6.24-rc for you?
>
> isn't this probably wrong since this code is also used in the vsyscall
> code..
the TSC clocksource (and hence the vsyscall code) is turned off on
systems that fail the TOD/CLOCK portion of this test:
http://people.redhat.com/mingo/time-warp-test/time-warp-test.c
i.e. on the majority of systems in place.
Ingo
next prev parent reply other threads:[~2007-12-11 17:04 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-11 13:11 Performance overhead of get_cycles_sync Dor Laor
2007-12-11 13:37 ` Ingo Molnar
2007-12-11 14:14 ` Dor Laor
[not found] ` <475E9A92.4030001@qumranet.com>
2007-12-11 14:27 ` Ingo Molnar
2007-12-11 15:03 ` Dor Laor
2007-12-11 16:35 ` Arjan van de Ven
2007-12-11 17:03 ` Ingo Molnar [this message]
2007-12-11 17:23 ` Andi Kleen
2007-12-11 20:19 ` Ingo Molnar
2007-12-11 20:29 ` Ingo Molnar
2007-12-11 21:26 ` [kvm-devel] " Joerg Roedel
2007-12-11 14:27 ` Andi Kleen
2007-12-11 14:57 ` Dor Laor
2007-12-11 15:02 ` Andi Kleen
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