On Saturday 10 January 2009, Clayton wrote:
The default pae kernel from 11.1 (2.6.27) is causing some very noticeable slowdowns, particularly in games like World of Warcraft in Wine/Cedega, and not just on my computer... several other people are grousing about the same issue in the Cedega community. It's not every 2.6.27 kernel though... seems tied to specific distributions like openSUSE,and maybe even specific hardware combinations... maybe. I'm not sure of all the details yet. It seems to be something to do with the scheduler... and as you roll back to previous kernels the performance increases... eg a 2.6.24 kernel is about 10 to 15% better for gaming than a 2.6.27 kernel. Not so important for those who don't game :-)
A little more on this.. it seems that more people are reporting similar issues.. specifically with openSUSE 11.1 and 11.1 on nVidia cards.
The opensuse 11.1 kernel isn't preemptible because of some errors. Try compiling the opensuse or vanilla one with CONFIG_PREEMPT set.
See: http://www.nvnews.net/vbulletin/showthread.php?t=125947 for example
So.. it appears it's not just me that is getting annoyed with this. I've been checking with other people running other distros, and the same kernel versions, and they are not seeing these issues with OpenGL applications.
I have not yet tried moving to a 64bit kernel - I'm DLing the ISO for that now though, and plan to switch from a 32it PAE kernel to the full 64bit kernel/install and see if that clears up the problems.
Is this worth reporting as a bug? Will anyone be interested in looking into it? Not really sure what to provide for information on a bug report since it seems to be a real subjective issue.
C.
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