Tobias Geiger
2012-Feb-24 10:12 UTC
Re: GPU Pass Through Comment - DomU GPU Performance Regression after Reboot - Workaround
Hi! after the first disappointment about the FirePro-Driver not solving my issue, i fiddled around with this problem and finally found a solution which solves the Performance-Regression i''m experiencing in my setup; The Problem is: GPU Performance degrades to about 10% after a DomU Reboot (GPU is ATI, but this also happend with a NVIDIA iirc , so no ATI-specific Problem). The Workaround: too easy :) Simply "Eject" the GPU after Windows has booted - the screen goes black, it re-initializes the Card and re-attaches after a few seconds. From then on Performance is back to normal. Ejecting is done via the little Device-Manager Icon in the Taskbar (this one: http://www.technipages.com/wp-content/uploads/2011/01/Windows-7-Remove- Hardware-option.pngwww.technipages.com/wp-content/uploads/2011/01/Windows-7- Remove-Hardware-option.png ) To Automate this, i used a little tool called "DevEject" from heise.de - it''s "OpenSource" Licensed and works even in Win7-64: ftp://ftp.heise.de/pub/ct/listings/0316-208.zip There may be other Tools/Scripting solutions via WSH/Powershell/VBS/CMD/... Greetings! Tobias Am Donnerstag, 23. Februar 2012, 01:39:08 schrieb ray@aarden.us:> After reading many posts on GPU pass through failing on reboot of the domU, >I questioned AMD and they responded with: > >This is the known and documented issue with hypervisor - Resolved issues >(release notes) with driver 8.83.5.4 and above - May see system hang on >restart with some hypervisors. Consider using a more recent firepro driver at >support.amd.com. > > >ray