Re: [Xen-devel] Performance difference between Xen versions

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 02.05.11 at 22:27, John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx> 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


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