Re: Fwd: Re: Xen 4.3 / 4.4 - concurrent APIs, VGA Passthru

[Gordan Bobic <gordan@bobich.net>]

On 08/03/2014 11:09 AM, Georg Bege wrote:
>
> Am 03.08.2014 11:49, schrieb Gordan Bobic:
>> On 08/02/2014 11:49 AM, Georg Bege wrote:
>>> Hello again
>>>
>>> Well so far I can now tell, I tested it on WinXP x64 quite a lot
>>> - most things are working.
>>> Including AAA games like Witcher 2, I didnt try a very memory consuming
>>> game yet.
>>> But I dont really think that I have the same bug you are refering to -
>>> in WinXP x64 the /PATCHTPR boot flag did help greatly, it really boosted
>>> the performance to near native.
>>
>> What does this flag do? Googling for it found no results.
> See:
> http://lists.xenproject.org/archives/html/xen-users/2013-09/msg00254.html
>
> But now I came to the conclusion that I dont have the same issue with
> Win7 at all (see last email).

This reminds me - I had issues with the latest GPLPV drivers on Windows 
7. The installer would just sit there and never complete, which also, 
IIRC, left the VM OS in a dodgy state. So I nstalled the same version 
(version number, not package, obviously) I've been running on XP64 for 
ages (11.0.372) and that worked fine.

>>> I dont think I encountered any memory usage, used like applications
>>> consuming the first 4GB of the DomU.
>>
>> I am inclined to agree, you aren't hitting the same problem.
>>
>>> Im trying to figure what to do for Windows 7, its working good too -
>>> even with VGA Passthrough,
>>> but its almost always consuming 33%-80% CPU usage for no reason...
>>
>> Can you check from within the domU which process is eating CPU? Or are
>> you saying that with Windows 7 inside your domU task manager is
>> showing 0% CPU usage but xentop is showing 33-80% CPU usage?
> I cant check, as states in the last email it must be about interrupts or
> power saving states - it only happens when I pass in the GFX.
> Without this the CPU is just idling on 0% inside the DomU.

Funnily enough, I'm seeing something similar in dom0 when I use a GT630 
card, but not when I'm using an 8800GT or Q2K. With the GT630, Xorg 
locks up immediately, eating 100% of CPU with ksoftirqd eating another 
100% of CPU. X process is unkillable so the only way to recover is to 
reboot the machine. The same GT630 runs fine in another machine so I'm 
reasonably sure that's not the problem. So it _could_ be a similar 
obscure bug in the Nvidia driver.

Have you tried 331.93? That's the driver I'm using.


Gordan