Re: Performance issue

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Nov 22, 2012 at 09:17:34PM +0200, George-Cristian Bîrzan wrote:
> I'm trying to understand a performance problem (50% degradation in the
> VM) that I'm experiencing some systems with qemu-kvm. Running Fedora
> with 3.5.3-1.fc17.x86_64 or 3.6.6-1.fc17.x86_64, qemu 1.0.1 or 1.2.1
> on AMD Opteron 6176 and 6174, and all of them behave identically.
> 
> A Windows guest is receiving a UDP MPEG stream that is being processed
> by TSReader. The stream comes in at about 73Mbps, but the VM cannot
> process more than 43Mbps. It's not a networking issue, the packets
> reach the guest and with iperf we can easily do 80Mbps. Also, with
> iperf, it can receive the packets from the streamer (even though it
> doesn't detect things properly, but it was just a way to see ).
> 
> However, on an identical host (a 6174 CPU, even), a Windows install
> has absolutely no problem processing the same stream.
> 
What Windows is this? Can you try changing "-cpu host" to "-cpu
host,+hv_relaxed"?

--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux