Re: [Xen-users] Network performance with HVM DomU

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Add back xen-users@

On Wed, May 18, 2016 at 08:15:38PM +0200, Christoph wrote:
> >
> >The first step would be to identify which component is slow.
> >
> >I suggest you measure the bandwidth from Windows DomU to Dom0 and Linux
> >DomU to Dom0 and see which half is slow.
> >
> >Wei.
> >
> 
> I get these results:
> 
> win domU -> dom0
> [  5] local 192.168.50.40 port 5001 connected with 192.168.50.110 port 50612
> [  5]  0.0- 1.4 sec  1.00 GBytes  6.31 Gbits/sec
> 
> linux domU -> dom0
> [  4] local 192.168.50.40 port 5001 connected with 192.168.50.50 port 56827
> [  4]  0.0- 1.3 sec  1.00 GBytes  6.43 Gbits/sec
> 
> dom0 -> win domU
> [  3] local 192.168.50.40 port 59474 connected with 192.168.50.110 port 5001
> [  3]  0.0- 1.0 sec  1.00 GBytes  8.21 Gbits/sec
> 
> dom0 -> linux domU
> [  3] local 192.168.50.40 port 58747 connected with 192.168.50.50 port 5001
> [  3]  0.0- 0.6 sec  1.00 GBytes  14.7 Gbits/sec
> 
> linux domU -> win domU
> [  4] local 192.168.50.50 port 5001 connected with 192.168.50.110 port 50615
> [  4]  0.0- 1.3 sec  1.00 GBytes  6.58 Gbits/sec
> 
> win domU -> linux domU
> [  3] local 192.168.50.50 port 37527 connected with 192.168.50.110 port 5001
> [  3]  0.0- 1.5 sec  1.00 GBytes  5.64 Gbits/sec

Yes, these results all look very sensible.

So basically you can rule out problems with network drivers.

> 
> it seems to be fast enough!? WTF?
> but copying with smb/cifs from win domU has max 16mb/s
> 

Do you happen to copy lots of small files? Is there application level
throttling going on?

(I'm afraid I'm not familiar with SMB to make sensible suggestions here.)

Wei.

> -- 
> ---------
> Greetz

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