linux-kernel - Re: gettimeofday() time warps on Nehalem

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Message-ID: <4A3C1279.6040506@athenacr.com>
Date:	Fri, 19 Jun 2009 18:34:33 -0400
From:	Brian Bloniarz <bmb@...enacr.com>
To:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: gettimeofday() time warps on Nehalem

Brian Bloniarz wrote:
> $ ./time-warp-test
> 16 CPUs, running 16 parallel test-tasks.
> checking for time-warps via:
> - gettimeofday (TOD) syscall (usec resolution)
> 
> new TOD-warp maximum:        -1 usecs,  00046cb465acb046 -> 00046cb465acb045
> new TOD-warp maximum:        -2 usecs,  00046cb465ad7515 -> 00046cb465ad7513
> TOD: 0.26us, fail:21534 \

Ignore this. I killed NTP before running these tests, but
it looks now like a script from my distro restarted it.

I can no longer reproduce the problem, sorry for the noise.

Thanks,
-Brian
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