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From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Performance overhead of get_cycles_sync
Date: Tue, 11 Dec 2007 21:19:30 +0100	[thread overview]
Message-ID: <20071211201930.GB22397@elte.hu> (raw)
In-Reply-To: <p73abohno0u.fsf@bingen.suse.de>


* Andi Kleen <ak@suse.de> wrote:

> Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org> writes:
> 
> > the TSC clocksource (and hence the vsyscall code) is turned off on 
> > systems that fail the TOD/CLOCK portion of this test:
> 
> Which is not on core2 which was the question about. And if it was 
> turned off it wouldn't use get_cycles_sync() at all.

it is turned off on core2 too:

 # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
 acpi_pm

	Ingo

  reply	other threads:[~2007-12-11 20:19 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
2007-12-11 17:23           ` Andi Kleen
2007-12-11 20:19             ` Ingo Molnar [this message]
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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