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RE: [Xen-users] Problems with GPLPV network latency

  • To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
  • Date: Tue, 8 Jun 2010 14:07:29 +0100
  • Cc:
  • Delivery-date: Tue, 08 Jun 2010 06:08:46 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcsG5QSmJGm6f+IDQcGckp7ibAKG6wAJSgmgAABMHFA=
  • Thread-topic: [Xen-users] Problems with GPLPV network latency

Yes it really does, also you cannot connect to RDP etc.

I have tried this from Dom0 already and the response time is pretty much
the same.  Ive changed it to single CPU and the problem remains.

Note when running normal driver it is fine so im not sure what could be
upsetting it


-----Original Message-----
From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx] 
Sent: 08 June 2010 14:00
To: Ian Tobin; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Problems with GPLPV network latency

> When i install the GPLPV drivers the network latency goes from 15ms to
> numbers up to 1200ms and eventually dies.  If you run a ping from the
DomU to
> another host the network stays alive but the high latency is still

Are you really seeing high latency or just reported high latency? Eg
when it says 1200ms, does it really take an extra second?

What if you ping from Dom0 to DomU?

I have seen problems before when you have multiple CPU's and the Xen
timer stuff doesn't work properly so windows reports strange packet
timestamps even though the actual latency is okay.

If you have more than 1 CPU assigned to your DomU, try with just 1 and
see if the problem goes away.

> Also if I uninstall everything using the installer the DomU blue
screens on
> reboot, im not sure how to get round that without a rebuild?

There is an uninstall.bat file where you downloaded GPLPV from. Try the
0.10 version (it works with 0.11 too) which will properly clean the
registry etc.


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