From: Sergei Shtylyov <sshtylyov@ru•mvista.com>
To: Olof Johansson <olof@lixom•net>
Cc: paulus@samba•org, linuxppc-dev@ozlabs•org
Subject: Re: New time code miscalculates cpu usage
Date: Thu, 25 Oct 2007 00:17:57 +0400 [thread overview]
Message-ID: <471FA875.6080602@ru.mvista.com> (raw)
In-Reply-To: <20071016202525.GA11837@lixom.net>
Hello.
Olof Johansson wrote:
> Not sure when this started happening, but I wanted to report it. I'll
> start bisecting in a day or two if noone else has gotten around to
> looking at it:
> $ echo "int main(void) { while(1); }" > test.c ; gcc test.c
> $ time ./a.out & sleep 2 ; killall a.out
> real 0m2.008s
> user 0m4.014s
> sys 0m0.002s
>
> Seen on POWER5 and PA6T, haven't tried anything else yet.
I'm not surprised -- the kernel accounts twice for each tick.
WBR, Sergei
next prev parent reply other threads:[~2007-10-24 20:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-16 20:25 New time code miscalculates cpu usage Olof Johansson
2007-10-17 6:07 ` Tony Breeds
2007-10-24 20:19 ` Olof Johansson
2007-10-24 20:17 ` Sergei Shtylyov [this message]
2007-10-24 21:56 ` Benjamin Herrenschmidt
2007-10-25 0:19 ` Paul Mackerras
2007-10-25 0:53 ` Benjamin Herrenschmidt
2007-10-25 12:46 ` Sergei Shtylyov
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