From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gordan Bobic Subject: Re: Fwd: Re: Xen 4.3 / 4.4 - concurrent APIs, VGA Passthru Date: Sun, 03 Aug 2014 10:49:06 +0100 Message-ID: <53DE0592.2040208@bobich.net> References: <53D5C00E.5040706@ninth-art.de> " <53D659C3.9010500@ninth-art.de>" <53D665C7.6010004@bobich.net> <53D6F500.1010806@ninth-art.de> <53D748DC.10209@bobich.net> <53D74F9E.6010508@ninth-art.de> <53D78B0D.802@ninth-art.de> <53DCC238.3030707@ninth-art.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <53DCC238.3030707@ninth-art.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: therion@ninth-art.de Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org 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. > 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 also stumpled upon the issue that if you reboot a VGA Passthru DomU > then that the GFX adapter looses performance (which was explained > somewhere in the docs already). That is _very_ wrong. That only happens on ATI GPUs, I have never seen that happen with an Nvidia GPU. > Atm. all this is done with Xen 4.4 - Im not sure why I would go back to > Xen 4.3, Xen is improving greatly over each version I think, that older > versions have more (unfixed) issues is quite logical. IMO that doesn't follow for any software. More feature doesn't mean fewer bugs, usually the opposite. > I just wonder what I can do for Win7 performance wise so that I can test > things like Borderlands 2 you referred to... or any other high memory > usage application. Borderlands 2 runs under XP64 just fine. I'm not sure what else to suggest, I rebuilt one of my two XP64 VMs to Win7 x64 the other day relatively painlessly. Same config, just different disk image. No problems so far. Gordan