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Fwd: Re: [uml-user] wondering about the output of time command (real/use


From: Toralf Förster
Subject: Fwd: Re: [uml-user] wondering about the output of time command (real/user)
Date: Mon, 4 Aug 2008 19:51:58 +0200
User-agent: KMail/1.9.9

Hello,

I'm wondering whether it is an issue (pls see below) with the built-in command
"time" of my bash (version is 3.2.33(1)-release) or of the liux kernel itself.


----------  Weitergeleitete Nachricht  ----------
Subject: Re: [uml-user] wondering about the output of time command (real/user)
Date: Monday 04 August 2008 19:00:35 :
From: Jeff Dike <address@hidden>
To: Toralf Förster <address@hidden>

On Thu, Jul 24, 2008 at 06:11:48PM +0200, Toralf Förster wrote:
> Hhm,
> 
> running the same command both at the host :
> 
> n22 ~ # time factor 819734028463158891
> 819734028463158891: 3 273244676154386297
> 
> real    0m6.002s
> user    0m5.911s
> sys     0m0.000s
> 
> and within UML image :
> 
> n22_uml ~ # time factor 819734028463158891
> 819734028463158891: 3 273244676154386297
> 
> real    0m6.084s
> user    0m3.010s
> sys     0m0.000s
> 
> I'm wondering why the same command at the same system needs within
> UML only half of the time as for the user part.

Looks like userspace ticks aren't being counted correctly...

That got trickier with the introduction of NOHZ.

                                  Jeff

-- 
Work email - jdike at linux dot intel dot com

-------------------------------------------------------

-- 
MfG/Sincerely

Toralf Förster
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