Marc Cousin
2006-Nov-21 10:56 UTC
[Xen-users] Network performance problem with Xen 3.0.3 HVM/VT
Hi, I know it''s a problem that has already been discussed, but as I didn''t see any solution, I''m asking... We''ve been trying to use Xen 3.0.3 HVM mode with windows or linux in the past few weeks, and have been suffering from bad network performance. First, I must say that we didn''t succed to setup Windows 2000/2003 directly using Xen, we had to install it using qemu and then boot it into Xen HVM. The performance problem seems to be coming from network latency : depending on the host OS, we have measured ping times ranging from 4ms (Windows 2000, Linux) to 10ms (Windows 2003). Of course, the network performance is suffering, with throughputs aroud 600kbytes/s for Windows 2003, and 3Mbytes for Windows 2000 and Linux. The CPUs are idle during our benchmarks. We suspected the network driver was using some kind of polling, because there is no load, and the latency is that big. We tried to compare with latest qemu, and qemu hasn''t displayed this latency problem. Does anybody know of this problem ? (a solution, workaroud, patch, would be even better of course :) ). This is a very big performance issue (for us), and we are reluctantly thinking about going back to vmware. Any help would be welcome Details about our setup : - This is using DELL PE2950 with woodcrest CPUs. - We use PAE build from Xen 3.0.3 sources - Configuration file : kernel = ''/usr/lib/xen/boot/hvmloader'' builder=''hvm'' memory = 512 name = "xxxxx" vcpus=1 acpi=0 apic=0 pae=0 vif = [ ''type=ioemu, mac=aa:00:00:e7:00:02, bridge=x-brxxxx''] disk = [ ''phy:/dev/drbd2,ioemu:hda,w'', ''file:/mnt/iso/windows2003p.iso,hdc:cdrom,r'' ] on_poweroff = ''destroy'' on_reboot = ''restart'' on_crash = ''restart'' device_model = ''/usr/lib/xen/bin/qemu-dm'' boot="c" sdl=0 vnc=1 vncviewer=0 nographic=0 ne2000=0 usb=1 usbdevice=''tablet'' audio=0 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
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