On Mon, Mar 10, 2008 at 3:37 PM, Dor Laor <[EMAIL PROTECTED]> wrote:
>
> 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/<http://www.cs.toronto.edu/%7Eandreslc/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
>
Thanks a lot for your help.. man
So, the performance numbers with public bridge, actually increases the
performance by many folds. Now I can copy the same 1 gb file in 1.30 mins..
which is awesome.
Now a dumb question (sorry :( ), but how do I use e1000 nic device and
driver. -net option can only support "ne2k_pci", "ne2k_isa", "rtl8139",
"smc91c111" and "lance". Which one of them is e1000. Also I am assuming,
that somewhere I can get e1000 device driver for window server 2003 too..
If there is already a wiki then can you please point me to it.
Also I had a suggestion. Would it make sense to update the wiki page to say,
that if you use NAT it will be slower, and for performance, the bridge model
should be used.
Just to make it explicit. I am ready to make the change, if everyone blesses
it..
Thanks a lot
Regards
Deep
--
Thanks
Dp
[The force is feminine in nature]
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