Re: [Xen-devel] 4.1.2 very slow without upstream patches, but fast with them, also 4.2 very slow

[Peter Maloney <peter.maloney@xxxxxxxxxxxxxxxxxxxx>]

> That still won't tell us which patches you did apply.
I applied no patches and tested, and the result was slow. And then
applied all patches, and it was fast. I didn't try figuring out which
one it was.


So I guess I'll try:
- the latest unstable 4.2
- the 4.1.3-rc (Which includes the patch Malcolm suggested)
- and my rpm source with half patches, 3/4 of them, etc. binary search
style to see which patch(es) changed the performance. But this means I
won't be able to narrow it down to a single patch, but only the point in
the long list where the most dramatic change happens, possibly depending
on many previous patches.

Thanks so far, guys.


On 08/06/2012 12:31 PM, Jan Beulich wrote:
>>>> On 06.08.12 at 12:12, Peter Maloney <peter.maloney@xxxxxxxxxxxxxxxxxxxx> 
>>>> wrote:
>> my AMD FX-8150 system with vanilla source code is super slow, both the
>> dom0 and domUs. However, after I merge the upstream patches I found in
>> the openSUSE rpm, it runs normally.
> I'd be very surprised if you really just took the upstream patches,
> and the result was better than 4.2-rc1. After all, what upstream
> means is that they were taken from -unstable.
>
>> I tried 4.2-unstable and it was the same. There was no rc1 when I tested
>> it about 1.5 weeks ago. And 4.2 has the same horrible performance, and
>> obviously those patches won't work any more since the 4.2 code looks
>> completely reorganized, so I'm stuck with 4.1.2
> Obviously the upstream patches can't be applied to something
> that already has all those changes. Other patches, of which we
> unfortunately have quite a few, would be a different story.
>
>> Here is the rpm I was using at the time:
>> http://download.opensuse.org/update/12.1/src/xen-4.1.2_16-1.7.1.src.rpm 
>>
>> To see the list of the patches and what order to apply them, see the
>> spec file.
> That still won't tell us which patches you did apply.
>
>> Please make sure this performance issue is fixed for the 4.2 release.
>> And I would be happy to test whatever files you send me.
> The sort of report you're doing isn't that helpful. What would
> help is if you could narrow down which patch(es) it is that
> make things so much better. Giving 4.1.3-rc a try might also
> be worthwhile, albeit I would hope we don't have a regression
> in 4.2.0-rc compared to 4.1.3-rc...
>
> Jan
>
>
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-- 

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Peter Maloney
Brockmann Consult
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Germany
Tel: +49 4152 889 300
Fax: +49 4152 889 333
E-mail: peter.maloney@xxxxxxxxxxxxxxxxxxxx
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