Hi I am developing Window pv network driver and hit a problem now. My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM with 1 VCPU on a same server, iperf performance is OK between those two VM, but there is performance degradation between those 2 VM when i increase VCPU from 1 to 2. This problem occurs in QEMU mode too. Does Xen 3.1.4 has such problem or anything wrong in my configure file? My configure file is as following: acpi = 1 apic = 1 boot = ''c'' builder = ''hvm'' bootloader = ''/usr/bin/pygrub'' device_model = ''/usr/lib/xen/bin/qemu-dm'' disk = [ ''file:/mnt/data/win2k3/Sys.img,hda,w!'', ] kernel = ''/usr/lib/xen/boot/hvmloader'' memory = ''600'' name = ''win2k3_s'' on_crash = '''' on_reboot = '''' serial = ''pty'' timer_mode = 1 usbdevice = ''tablet'' vcpus = 1 vif = [ ''type=ioemu, mac=00:16:3E:55:D1:80, bridge=xenbr0'', ] vnc = 1 vncconsole = 1 vnclisten = ''0.0.0.0'' vncpasswd = '''' vncunused = 1 Thanks Annie. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> Hi > > I am developing Window pv network driver and hit a problem now. > > My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM > with 1 VCPU on a same server, iperf performance is OK between thosetwo> VM, but there is performance degradation between those 2 VM when i > increase VCPU from 1 to 2. > This problem occurs in QEMU mode too. > > Does Xen 3.1.4 has such problem or anything wrong in my configurefile?>Annie, I think it would be worthwhile testing Xen-3.3.1 as I get comparable performance on SMP vs UP under 2003 (around 80% I think). Under XP, SMP and UP performance are much closer, due to the way interrupts are handled (according to the guys on the ntdev list). James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
James, Thanks a lot. I will have a test on xen3.3.1. Thanks Annie James Harper wrote:>> Hi >> >> I am developing Window pv network driver and hit a problem now. >> >> My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM >> with 1 VCPU on a same server, iperf performance is OK between those >> > two > >> VM, but there is performance degradation between those 2 VM when i >> increase VCPU from 1 to 2. >> This problem occurs in QEMU mode too. >> >> Does Xen 3.1.4 has such problem or anything wrong in my configure >> > file? > > > Annie, > > I think it would be worthwhile testing Xen-3.3.1 as I get comparable > performance on SMP vs UP under 2003 (around 80% I think). > > Under XP, SMP and UP performance are much closer, due to the way > interrupts are handled (according to the guys on the ntdev list). > > James >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel