On Mon, 2008-03-10 at 12:13 -0700, Jorge Lucángeli Obes wrote: > On Mon, Mar 10, 2008 at 11:58 AM, Dhirendra Pal Singh > <[EMAIL PROTECTED]> wrote: > > Hi Guys, > > > > I am trying to evaluate, kvm at my work for virtual support in our product.. > > > > I had setup up a windows guest, in my ubuntu host, on hardware with Intel VT > > support. > > > > Now when I try to download a 1 GB file present, inside windows virtual > > machine, using samba, from a another linux box, I get the following... > > > > > > a) time when coping from windows in kvm > > > > linux:~/tmp # time cp /media/hdisk/1GB_text.txt . > > > > real 6m36.478s > > > > user 0m0.060s > > > > sys 0m8.293s > > > > linux:~/tmp # > > > > > > b) time when coping from linux native.. > > > > linux:~/tmp/tmp # time cp /media/hdisk/1GB_text . > > > > real 0m49.501s > > > > user 0m0.040s > > > > sys 0m8.657s > > > > linux:~/tmp/tmp # > > > > > > So its like 50second (linux native) Vs 6+minutes(windows guest in KVM), > > which is huge. > > > > This is using user based networking, where I am just forwarding all the > > netbios ports from host to guest. > > > > Are there any links, pointers, faqs, ideas , suggestions I could try out to > > increase the performance of this kvm virtual machine? Will using public > > bridge (option 3), as described on page > > http://kvm.qumranet.com/kvmwiki/Networking help? > > Most probably. When I was trying VMGL > (http://www.cs.toronto.edu/~andreslc/xen-gl/) in KVM I got a 20-fold > increase in performance when I switched from usermode networking to > the tap/bridge approach. Definitely try it. I assume you are forced to > use a Windows guest, but if not you might also want to try virtio > (http://kvm.qumranet.com/kvmwiki/Virtio). >
We published virtio network drivers for Linux but not yet for Windows. Our virtio drivers for windows are almost done (for rev#1), we'll surely release the binaries for them. In the mean time you can use e1000 nic device & driver. It has the best results among the emulated devices and even close to virtio performance. Regards, Dor ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kvm-devel
