From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Marco Tizzoni <marco.tizzoni@gmail.com>
Cc: "Fajar A." <fajar@fajar.net>, Fasiha Ashraf <feehapk@yahoo.co.in>,
xen <xen-devel@lists.xensource.com>,
xen-users@lists.xensource.com
Subject: Re: Re: [Xen-users] About profiling xen
Date: Thu, 01 Oct 2009 15:01:59 -0700 [thread overview]
Message-ID: <4AC526D7.3070405@goop.org> (raw)
In-Reply-To: <f9611b0f0910011455q722f5755i5f319d3e6f27c14a@mail.gmail.com>
On 10/01/09 14:55, Marco Tizzoni wrote:
> Sorry, I was not clear. It works as I expect, i.e going not over 1000
> hz (my dom0 kernel has been compiled with 1000hz).
>
OK, that's definitely *not* expected. If you're running with
CONFIG_NO_HZ and HIGH_RES_TIMERS then timer resolution should have
nothing to do with your HZ configuration.
> Following a couple of run of your testtimer:
>
> hal9k-dom0 ~ # ./testtimer .000001 |head -n10
>
I think expecting a timer to work at 1MHz is unreasonable.
> 1000 iterations at 0.000001 sec
> 0.000662
> 0.000946
> 0.000956
> 0.000960
> 0.000962
> 0.000956
> 0.000964
> 0.000963
> 0.000964
> 0.000964
>
> hal9k-dom0 ~ # ./testtimer .00001 |head -n10
>
100kHz is also very demanding.
How does it work with 2kHz? 10kHz?
J
next prev parent reply other threads:[~2009-10-01 22:01 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-30 6:07 About profiling xen Fasiha Ashraf
2009-09-30 6:33 ` [Xen-users] " Marco Tizzoni
2009-09-30 6:37 ` Pasi Kärkkäinen
2009-09-30 6:40 ` Marco Tizzoni
2009-09-30 7:45 ` Marco Tizzoni
2009-09-30 9:06 ` [Xen-devel] " Marco Tizzoni
2009-09-30 14:21 ` Dan Magenheimer
2009-09-30 14:48 ` Re: [Xen-users] " Marco Tizzoni
2009-09-30 16:04 ` Dan Magenheimer
2009-09-30 16:38 ` Marco Tizzoni
2009-09-30 23:23 ` [Xen-devel] " Jeremy Fitzhardinge
2009-10-01 7:35 ` Marco Tizzoni
2009-10-01 20:54 ` Re: [Xen-users] " Jeremy Fitzhardinge
2009-10-01 21:05 ` [Xen-devel] " Marco Tizzoni
2009-10-01 21:16 ` Re: [Xen-users] " Jeremy Fitzhardinge
2009-10-01 21:26 ` Marco Tizzoni
2009-10-01 21:40 ` Jeremy Fitzhardinge
2009-10-01 21:55 ` [Xen-devel] " Marco Tizzoni
2009-10-01 22:01 ` Jeremy Fitzhardinge [this message]
2009-10-01 22:20 ` Re: [Xen-users] " Marco Tizzoni
2009-10-05 11:38 ` Fasiha Ashraf
2009-10-05 20:53 ` Jeremy Fitzhardinge
2009-10-06 5:01 ` [Xen-devel] " Fasiha Ashraf
2009-10-06 5:30 ` Re: [Xen-users] " Jeremy Fitzhardinge
2009-09-30 9:16 ` Fasiha Ashraf
2009-09-30 9:23 ` [Xen-devel] " Pasi Kärkkäinen
2009-10-01 3:41 ` Re: [Xen-users] " Fasiha Ashraf
2009-10-01 9:44 ` [Xen-devel] " Fasiha Ashraf
2009-09-30 23:19 ` Jeremy Fitzhardinge
2009-10-06 7:22 ` Fasiha Ashraf
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