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Old 11-03-2009, 08:15 PM
Thomas Goirand
 
Default oldschool xen kernel on sid

Ian Campbell wrote:
> On Tue, 2009-11-03 at 19:41 +0800, Thomas Goirand wrote:
>> Bastian Blank wrote:
>>>> Yes. http://hermes.jura.uni-tuebingen.de/~blank/debian/xen-test.
>> I used to run the 2.6.26-2-xen-amd64 dom0, and it was quite fast. Since
>> I am using that new version, I really have the bad feeling that my
>> computer is A LOT slower than before. It used to be nearly as fast as
>> the non-xen kernel. Any idea what's happening here?
>
> Did you compare 2.6.31-native to 2.6.31-xen or just 2.6.26-{native,xen}
> to 2.6.31-xen. IOW have you really narrowed it down to the Xen bits
> rather than a more generic slow down?

I'm comparing 2.6.31-xen to 2.6.26-2-xen, and I have the feeling that
2.6.31 is a lot slower.

> If you can provide data or measurements to support your feeling then I'm
> sure upstream would be interested to hear about it.

What should I use? Unix bench for example?

Thomas


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Old 11-04-2009, 03:26 PM
Ian Campbell
 
Default oldschool xen kernel on sid

On Wed, 2009-11-04 at 05:15 +0800, Thomas Goirand wrote:
> Ian Campbell wrote:
> > On Tue, 2009-11-03 at 19:41 +0800, Thomas Goirand wrote:
> >> Bastian Blank wrote:
> >>>> Yes. http://hermes.jura.uni-tuebingen.de/~blank/debian/xen-test.
> >> I used to run the 2.6.26-2-xen-amd64 dom0, and it was quite fast. Since
> >> I am using that new version, I really have the bad feeling that my
> >> computer is A LOT slower than before. It used to be nearly as fast as
> >> the non-xen kernel. Any idea what's happening here?
> >
> > Did you compare 2.6.31-native to 2.6.31-xen or just 2.6.26-{native,xen}
> > to 2.6.31-xen. IOW have you really narrowed it down to the Xen bits
> > rather than a more generic slow down?
>
> I'm comparing 2.6.31-xen to 2.6.26-2-xen, and I have the feeling that
> 2.6.31 is a lot slower.

It would be worth comparing 2.6.31-native to 2.6.26-native as well.

> > If you can provide data or measurements to support your feeling then I'm
> > sure upstream would be interested to hear about it.
>
> What should I use? Unix bench for example?

kernbench might be a good first step, but really it depends on exactly
what you perceive to be slow.

Ian.


--
Ian Campbell

"I once witnessed a long-winded, month-long flamewar over the use of
mice vs. trackballs...It was very silly."
(By Matt Welsh)


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