From: Cyril Hrubis <chrubis@suse.cz>
To: ltp-list@lists.sourceforge.net
Subject: Re: [LTP] questions about getrusage04
Date: Mon, 8 Dec 2014 13:09:22 +0100 [thread overview]
Message-ID: <20141208120922.GD11071@rei.suse.de> (raw)
In-Reply-To: <20141206012422.GA3352@localhost.localdomain>
Hi!
> I cannot understand why udelta/sdelta > "1000+(BIAS_MAX*factor_nr)" is a
> problem. Could any expert give me a explain, please?
It tests timer precision for getrusage timers. If the timers are
incremting by larger values than expected, something is wrong in kernel.
The precision depends on CONFIG_HZ settings which is represented by the
BIAS_MAX.
> And looks like with this patch applied, it works well on powerpc:
Can you please share the output of the testcase on ppc and ppc64? What
is the expected timer granularity there?
--
Cyril Hrubis
chrubis@suse.cz
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next prev parent reply other threads:[~2014-12-08 12:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-06 1:24 [LTP] questions about getrusage04 Han Pingtian
2014-12-08 12:09 ` Cyril Hrubis [this message]
2014-12-08 13:03 ` Han Pingtian
2014-12-08 13:19 ` Cyril Hrubis
2014-12-08 13:52 ` Han Pingtian
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