Am 17.10.2012 23:33, schrieb Cole Robinson: > On 10/17/2012 05:23 PM, Stefan G. Weichinger wrote: >> Am 17.10.2012 02:53, schrieb Cole Robinson: >> >>> Your guest config up thread looked fine AFAICT. But then I've never tried to >>> run a kernel-2.2 VM. >>> >>> The OS type in virt-manager for linux 2.4 vs. generic isn't going to make much >>> difference either. >>> >>> Maybe try switch the CPU model to some older type CPUs pentium2 etc, whatever >>> was common around the time of that release. Perhaps also try switch domain >>> type="qemu", occasionally kvm can interfere with things. >>> >>> Barring any of those, I'd try and build a qemu command line by hand that >>> reproduces the issue, confirm with latest qemu, and mail qemu-devel about your >>> issue. >> >> Thanks for your suggestions, Cole. >> >> As you may have read already I was able to solve that issue by enabling >> DMA for that virtual IDE-drive. This helped to fix the performance >> problems! >> > > Hmm, I didn't see that. Just curious, where was that discussed? And how did > you turn on IDE DMA? I only posted that to the libvirt-users-ml, sorry. Basically I added some commands to the startup-scripts of the guest: /etc/rc.d/boot.local now contains: /sbin/hdparm -d1 -m16 /dev/hda /sbin/hdparm -d1 -m16 /dev/hdb I wasn't successful with adding kernel-options in lilo.conf, maybe that old 2.2-kernel doesn't really get it. So at boot-time it runs without DMA until that boot.local script gets started, from there it is quite fast and responsive. Stefan
