how increase performance of network io in kvm

how increase performance of network io in kvm

[Dhirendra Pal Singh]

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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?


-- 
Thanks
/dev/deep

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Re: how increase performance of network io in kvm

[Jorge Lucángeli Obes]

On Mon, Mar 10, 2008 at 11:58 AM, Dhirendra Pal Singh
<dpal.singh@gmail.com> 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).

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Re: how increase performance of network io in kvm

[Dhirendra Pal Singh]

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Thanks for the tip.. okay.. I am going to set up the public bridge in that
case.. and see what can I do..

Yes I am being forced to use windows guest... :(

I am a die hard linux fan and hasn't used windows for almost 3 -4 years
now..

Will update you guys again after I do the test..

Thanks for a quick reply..
Regards
/dev/deep


On Mon, Mar 10, 2008 at 12:13 PM, Jorge Lucángeli Obes <t4m5yn@gmail.com>
wrote:

> On Mon, Mar 10, 2008 at 11:58 AM, Dhirendra Pal Singh
> <dpal.singh@gmail.com> 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).
>



-- 
Thanks
Dp
[The force is feminine in nature]

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Re: how increase performance of network io in kvm

[Dhirendra Pal Singh]

[-- Attachment #1.1: Type: text/plain, Size: 1434 bytes --]

sure.. I am going to do bridged networking next thing and re-run my test and
see where I get..

Thanks for the info... I am using rtl8139 driver as windows 2003 server
wasn't recognizing the default one...

*********
the very best would be to have paravirtualized drivers on windows...
there's some work on GPL'ed drivers for windows on Xen; does anybody
knows if they use a similar interface? (virtio?)
*********
Now I don't know where to find that? :( Sorry I am a newbie

Thanks again
Regards
/dev/deep


On Mon, Mar 10, 2008 at 12:09 PM, Javier Guerra <javier@guerrag.com> wrote:

> On Mon, Mar 10, 2008 at 1:58 PM, Dhirendra Pal Singh
> <dpal.singh@gmail.com> wrote:
> > This is using user based networking, where I am just forwarding all the
> > netbios ports from host to guest.
>
> user based networking is a nice option to have, but a HUGE performance
> hog.  get bridged networking.
>
> also, the choice of emulated NIC makes a noticeable difference.  i
> think e1000 is the fastest these days.
>
> the very best would be to have paravirtualized drivers on windows...
> there's some work on GPL'ed drivers for windows on Xen; does anybody
> knows if they use a similar interface? (virtio?)  so far their
> performance isn't so great, much lower than KVM's e1000, it seems.
> but once they optimize it, it could be similar to linux's virtio
> drivers.
>
>
>
> --
> Javier
>



-- 
Thanks
Dp
[The force is feminine in nature]

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Re: how increase performance of network io in kvm

[Dor Laor]

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
> <dpal.singh@gmail.com> 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


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Re: how increase performance of network io in kvm

[Javier Guerra]

On Mon, Mar 10, 2008 at 5:37 PM, Dor Laor <dor.laor@gmail.com> wrote:
>  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.

great!!  no need to fool around with xen/vmware then :-)

any word about availability/license/price on the windows drivers?

>  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.

and for storage? i'm guessing one of the SCSI emulations would be the best...


-- 
Javier

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Re: how increase performance of network io in kvm

[Dhirendra Pal Singh]

[-- Attachment #1.1: Type: text/plain, Size: 3264 bytes --]

On Mon, Mar 10, 2008 at 3:37 PM, Dor Laor <dor.laor@gmail.com> 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
> > <dpal.singh@gmail.com> 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


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Re: how increase performance of network io in kvm

[Jorge Lucángeli Obes]

> 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.

Cool!

> 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..

I don't know if the driver is included in Windows 2K3 but it should be
easy to find if not. I would try using 'e1000' as the device, that's
probably how it was named and it's not yet included in the help text.

> 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..

The VMGL/KVM mini-HOWTO mentions the massive drop in performance using
usermode networking, but I think it would be useful to have it in the
main networking page also. I would say go ahead, that's what wikis are
for =).

Jorge

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Re: how increase performance of network io in kvm

[Dhirendra Pal Singh]

[-- Attachment #1.1: Type: text/plain, Size: 2122 bytes --]

On Tue, Mar 11, 2008 at 2:03 PM, Jorge Lucángeli Obes <t4m5yn@gmail.com>
wrote:

> > 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 1.30mins..
> > which is awesome.
>
> Cool!
>
> > 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..
>
> I don't know if the driver is included in Windows 2K3 but it should be
> easy to find if not. I would try using 'e1000' as the device, that's
> probably how it was named and it's not yet included in the help text.


I tried e1000 and it says  "qemu: Unsupported NIC: e1000".... :( Did I miss
something.. ?

I downloaded the latest code base for qemu, and I see the following lines in
qemu-doc.texi

*********************
@code{i82551}, @code{i82557b}, @code{i82559er},
@code{ne2k_pci}, @code{ne2k_isa}, @code{pcnet}, @code{rtl8139},
@code{smc91c111}, @code{lance} and @code{mcf_fec}.
*********************

I don't see any e1000 entry there? Meanwhile I am trying to build latest
version of qemu and see if it gets me anywhere.


>
> > 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..
>
> The VMGL/KVM mini-HOWTO mentions the massive drop in performance using
> usermode networking, but I think it would be useful to have it in the
> main networking page also. I would say go ahead, that's what wikis are
> for =).


Done... :)
Also when I get this e1000 thingi working, I am going to add this to the
wiki too :)

Thanks and Regards
Deep



>
> Jorge
>



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Re: how increase performance of network io in kvm

[Dor Laor]

On Tue, 2008-03-11 at 15:30 -0700, Dhirendra Pal Singh wrote:
> I tried e1000 and it says  "qemu: Unsupported NIC: e1000".... :( Did I
> miss something.. ?
> 
> I downloaded the latest code base for qemu, and I see the following
> lines in qemu-doc.texi
> 
> *********************
> @code{i82551}, @code{i82557b}, @code{i82559er},
> @code{ne2k_pci}, @code{ne2k_isa}, @code{pcnet}, @code{rtl8139},
> @code{smc91c111}, @code{lance} and @code{mcf_fec}.

The new source contains e1000 line too
> *********************
> 
> I don't see any e1000 entry there? Meanwhile I am trying to build
> latest version of qemu and see if it gets me anywhere.
> 
> 

You probably use the qemu that comes with your distribution and not the
new source.

You should find a qemu/hw/e1000.c file if you have an updated
repository.


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Re: how increase performance of network io in kvm

[Dhirendra Pal Singh]

[-- Attachment #1.1: Type: text/plain, Size: 1558 bytes --]

On Wed, Mar 12, 2008 at 2:46 AM, Dor Laor <dor.laor@gmail.com> wrote:

>
> On Tue, 2008-03-11 at 15:30 -0700, Dhirendra Pal Singh wrote:
> > I tried e1000 and it says  "qemu: Unsupported NIC: e1000".... :( Did I
> > miss something.. ?
> >
> > I downloaded the latest code base for qemu, and I see the following
> > lines in qemu-doc.texi
> >
> > *********************
> > @code{i82551}, @code{i82557b}, @code{i82559er},
> > @code{ne2k_pci}, @code{ne2k_isa}, @code{pcnet}, @code{rtl8139},
> > @code{smc91c111}, @code{lance} and @code{mcf_fec}.
>
> The new source contains e1000 line too
> > *********************
> >
> > I don't see any e1000 entry there? Meanwhile I am trying to build
> > latest version of qemu and see if it gets me anywhere.
> >
> >
>
> You probably use the qemu that comes with your distribution and not the
> new source.
>
> You should find a qemu/hw/e1000.c file if you have an updated
> repository.
>
> I got the latest snapshot of qemu and sure enough there was e1000 driver
support in it.. Though I didn't see much difference between RealTek Driver
Vs e1000...
Following was the test result...

Copying 1GB file
real    3m48.284s
user    0m0.072s
sys     0m8.609s

Though a bit lesser then RealTek,  it isn't much.. It seems i will have to
wait for VirtIO drivers...

If you or anyone else has any ideas on how to improve network performance
then please do share..

BTW where can I check when windows binary will be ready as I would like to
give it a shot?

Thanks and Regards
Deep


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Re: how increase performance of network io in kvm

[Anthony Liguori]

Dhirendra Pal Singh wrote:
> I got the latest snapshot of qemu and sure enough there was e1000 
> driver support in it.. Though I didn't see much difference between 
> RealTek Driver Vs e1000...
> Following was the test result...
>
> Copying 1GB file
> real    3m48.284s
> user    0m0.072s
> sys     0m8.609s

You won't see much of a performance improvement unless you're using tap 
instead of usernet.

Regards,

Anthony Liguori


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