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>]

So... did my 4.2-unstable test, using a fresh pull from yesterday; dom0
is normal fast (unlike previous tests), and domU is ultra slow, but
actually boots, and graphics card passthrough works without any patches,
and so does the USB keyboard, but USB mouse passthrough doesn't work.


On 08/07/2012 09:25 AM, Peter Maloney wrote:
>> 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
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-devel
>



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