linux-kernel - Re: Performance overhead of get_cycles

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Message-ID: <p73abohno0u.fsf@bingen.suse.de>
Date:	Tue, 11 Dec 2007 18:23:45 +0100
From:	Andi Kleen <ak@...e.de>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Performance overhead of get_cycles_sync

Ingo Molnar <mingo-X9Un+BFzKDI@...lic.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.

-Andi
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