On 03/17/2010 09:22 AM, Thomas Løcke wrote:
Hey all, I'm working on moving from a mixture of physical servers and virtualized servers running on Virtualbox, to a pure KVM setup. But I'm having some problems with my Windows XP guests in my test-setup. This is the host I'm testing on: CPU: Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz RAM: 8GB 2x320GB WD SATA disks (one for host OS and one for KVM guest images) 2x1GBs Intel nics (bonded) Host OS is Slackware 13 with the following kernels: 2.6.29.6-huge, 2.6.29.6-generic, 2.6.33 and 2.6.33.1 qemu-kvm is 0.12.3
qemu's been changing a lot, might be best to build from the actual git repository, which is 0.12.50 now.
My Linux guests works like a charm. When they boot up I do a single "ntpdate -b europe.pool.ntp.org" and after that the time stays in near perfect sync with the host, with no ntpd running on the guests. My Windows XP guests on the other hand drifts backwards in time, especially when there's load on the guest, for example when I'm copying a large file from my samba server to the Windows XP guest. The guest can easily lose 10 minutes while copying a 600MB file. Or if I start a few browsers and point them at some horrible flash heavy sites and just let them sit there, then the VM also start losing a lot of time real fast.
What's your host CPU load get up to. You only have a single core?
This is the commandline I use to start the Windows XP guests: qemu-system-x86_64 -hda winxppro.raw -boot c -m 1024 -vnc :1 -k da -smp 1 -localtime -daemonize -name qemu_winxppro,process=qemu_winxppro -net nic,macaddr=de:ad:be:ef:00:01,model=rtl8139 -net tap -runas kvm I use the same commandline for my Linux guests, except the nic is virtio. I'm at my wits end. I've tried the -tdf option with no success. I've tried setting various -rtc options with no success.
Including -rtc-td-hack ?
Could it be I'm missing some key-component in the kernel? Or is there perhaps some dev version of qemu-kvm I could/should try? According to some of the #kvm residents, this should "just work" (tm), but I simply cannot make it happen. Any and all advice are more than welcome.
As always, make sure you are running the latest and greatest modules, those matter even more than the kernel, and check for any warning messages in dmesg and qemu output.
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