From: "Jan Beulich" <JBeulich@novell.com>
To: John Weekes <lists.xen@nuclearfallout.net>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: Performance difference between Xen versions
Date: Tue, 03 May 2011 08:23:03 +0100 [thread overview]
Message-ID: <4DBFC977020000780003F537@vpn.id2.novell.com> (raw)
In-Reply-To: <4DBF13BB.3000309@nuclearfallout.net>
>>> On 02.05.11 at 22:27, John Weekes <lists.xen@nuclearfallout.net> wrote:
> On 5/2/2011 12:23 AM, Jan Beulich wrote:
>> Correct. I generally found the default threshold of the ondemand
>> governor nor very suitable for optimal performance of short lived
>> jobs, and boot all of my systems with "cpufreq=xen:ondemand,threshold=20".
>
> Just sending you a quick note here to let you know that "threshold=20"
> apparently isn't a valid option in 4.1. "up_threshold=20" is what's
> needed there, instead. It looks like this was changed in 2009:
> http://xenbits.xensource.com/hg/staging/xen-4.1-testing.hg/rev/ce391986ce35
>
> The threshold can also be changed with "xenpm set-up-threshold" at runtime.
Indeed, thanks for pointing that out. I must not have updated my
boot loader settings in that respect for a very long time... And
Xen should probably warn about unrecognized options (preparing
a patch as I write this).
Jan
prev parent reply other threads:[~2011-05-03 7:23 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-29 12:32 Performance difference between Xen versions Juergen Gross
2011-04-29 13:28 ` Keir Fraser
2011-04-29 13:35 ` Juergen Gross
2011-04-29 14:58 ` Keir Fraser
2011-04-29 16:10 ` Jan Beulich
2011-05-02 5:31 ` Juergen Gross
2011-05-02 6:41 ` Keir Fraser
2011-05-02 7:23 ` Jan Beulich
2011-05-02 8:00 ` Juergen Gross
2011-05-02 8:15 ` Jan Beulich
2011-05-02 8:23 ` Juergen Gross
2011-05-02 8:49 ` Keir Fraser
2011-05-03 3:06 ` Tian, Kevin
2011-05-06 13:49 ` Juergen Gross
2011-05-06 14:27 ` Jan Beulich
2011-05-11 6:08 ` Tian, Kevin
2011-05-11 6:23 ` Juergen Gross
2011-05-02 17:52 ` John Weekes
2011-05-02 18:12 ` Konrad Rzeszutek Wilk
2011-05-02 18:43 ` John Weekes
2011-05-02 19:16 ` John Weekes
2011-05-02 19:36 ` Konrad Rzeszutek Wilk
2011-05-02 19:54 ` John Weekes
2011-05-03 2:16 ` Tian, Kevin
2011-05-03 3:04 ` Tian, Kevin
2011-05-03 3:39 ` John Weekes
2011-05-03 7:23 ` Tian, Kevin
[not found] ` <4DBF13BB.3000309@nuclearfallout.net>
2011-05-03 7:23 ` Jan Beulich [this message]
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