Re: KVM performance

["David S. Ahern" <daahern@cisco.com>]

See if boosting the priority of the VM (see man chrt), and locking it to
a core (see man taskset) helps. You'll want to do that for the vcpu
thread(s) (in the qmeu monitor, run 'info cpus' command).

david


Randy Broman wrote:
> I am using Intel Core2 Duo E6600, Kubuntu 8.04 with kernel
> 2.6.24-21-generic,
> kvm (as in "QEMU PC emulator version 0.9.1 (kvm-62)") and a WinXP SP3
> guest,
> with bridged networking. My start command is:
> 
> sudo kvm -m 1024 -cdrom /dev/cdrom -boot c -net
> nic,macaddr=00:d0:13:b0:2d:32,
> model=rtl8139 -net tap -soundhw all -localtime /home/rbroman/windows.img
> 
> All this is stable and generally works well, except that internet-based
> video and
> audio performance is poor (choppy, skips) in comparison with performance
> under
> WinXP running native on the same machine (it's a dual-boot). I would
> appreciate
> recommendations to improve video and audio performance, and have the
> following
> specific questions:
> 
> -I've tried both the default Cirrus adapter and the "-std-vga" option.
> Which is better?
> I saw reference to another VMware-based adapter, but I can't figure out
> how to implement
> it - would that be better?
> 
> -I notice we're up to kvm-79 vs my kvm-62. Should I move to the newer
> version? Do I
> have to custom-compile my kernel to do so, and if so what kernel version
> and what
> specific kernel options should I use?
> 
> -Are there other tuning steps I could take?
> 
> Please copy me directly as I'm not on this list. Thankyou
> 
> 
> 
> 
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