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Re: [Xen-users] Slow networking problem in dom0

  • To: erwan.renier@xxxxxxxxxxx
  • From: Joel Witherspoon <joel.witherspoon@xxxxxxxxx>
  • Date: Sat, 14 May 2011 09:50:39 -0700
  • Cc: Emil Christopher Melar <typeof@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sat, 14 May 2011 09:53:12 -0700
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Erwan has the right idea. Check with tcpdump and Wireshark first. Check Large Send Offload as well. Turn it off if it's enabled.

Joel C. Witherspoon

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On Sat, May 14, 2011 at 9:14 AM, Erwan RENIER <erwan.renier@xxxxxxxxxxx> wrote:
Did you try tcpdump  allready to examine it with wireshark, to see i there are problems with the flows ( like retransmitted paquets ) , i had this problem on virtualbox that maid the network very slow.
Another option is to not bridge but route the network, at least to see if it works.
Also did you check your stats on the interfaces and on the bridge for errors ?
can you post the result of : ifconfig -a on the host.
Is there any relevant logs ( dmesg ).

Le 14/05/2011 18:03, Emil Christopher Melar a écrit :

On Sat, May 14, 2011 at 5:48 PM, Erwan RENIER<erwan.renier@xxxxxxxxxxx>  wrote:
And from domU to internet ?
Thanks for the response! :-)

domU to internet also has the same speed as LAN (600k/sec tops). It
climbs up to that speed slower and slower on a big download. Whereas
on dom0<-->  internet it gets to 2 MB/sec.

Le 14/05/2011 16:34, Emil Christopher Melar a écrit :
I still have the same problem with slow LAN speed, and I may have to
see myself forced to drop Xen altogether, which is kind of sad.
Any hint would be greatly appreciated!

On Fri, Apr 29, 2011 at 6:33 PM, Emil Christopher Melar
<typeof@xxxxxxxxx>    wrote:
On Fri, Apr 29, 2011 at 5:12 PM, Mike Wright<mike.wright@xxxxxxxxxxxxxx>

This may be the problem.  Try "ethtool -K eth0 tx off"

Thanks for the suggestion, but it made no difference. I tested domU
<--->    dom0 and that was lightning fast actually. But I would expect
that from a virtual bridge.
dom0<-->    internet seems to also go faster. I get 500-600 kb/s  on
LAN, but 1.5MB/s on internet from dom0, which is my max.
Isn't my bridge setup pretty standard? Seems like LAN speed is the
Emil Christopher Solli Melar

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