From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: Arjan van de Ven <arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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-NIQFrBLA1CpScpXdPBN83iCwEArCW2h5@public.gmane.org>
* Arjan van de Ven <arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> wrote:
> > * Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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
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next prev parent reply other threads:[~2007-12-11 17:03 UTC|newest]
Thread overview: 11+ 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
[not found] ` <20071211133738.GA8150-X9Un+BFzKDI@public.gmane.org>
2007-12-11 14:11 ` Dor Laor
[not found] ` <475E9A92.4030001-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-12-11 14:27 ` Ingo Molnar
2007-12-11 16:35 ` Arjan van de Ven
[not found] ` <20071211083513.56c2a385-NIQFrBLA1CpScpXdPBN83iCwEArCW2h5@public.gmane.org>
2007-12-11 17:03 ` Ingo Molnar [this message]
[not found] ` <p73abohno0u.fsf@bingen.suse.de>
[not found] ` <20071211201930.GB22397@elte.hu>
[not found] ` <20071211201930.GB22397-X9Un+BFzKDI@public.gmane.org>
2007-12-11 20:29 ` Ingo Molnar
[not found] ` <20071211142717.GA15903-X9Un+BFzKDI@public.gmane.org>
2007-12-11 15:03 ` Dor Laor
2007-12-11 21:26 ` Joerg Roedel
[not found] ` <20071211212628.GB6537-5C7GfCeVMHo@public.gmane.org>
2007-12-12 0:19 ` Dor Laor
2007-12-11 14:14 ` Dor Laor
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