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RE: [Xen-users] Windows 2008 - slow upload

  • To: "Tomek" <timor@xxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Tue, 4 Aug 2009 23:25:37 +1000
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 04 Aug 2009 06:27:27 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcoVBc2K2jAw1vCQRv6F1kBcOCKlyAAANVXw
  • Thread-topic: [Xen-users] Windows 2008 - slow upload

> -------- Original Message  --------
> Subject: Re: [Xen-users] Windows 2008 - slow upload
> From: James Harper <james.harper@xxxxxxxxxxxxxxxx>
> To: Tomek <timor@xxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
> Date: 04.08.2009 01:50
> > Okay. I could imagine some vlan problems if large send or checksum
> > offloading was involved but with those off it's unlikely. You aren't
> > using jumbo frames are you?
> And that's the point. After GPLPV installation large send data offload
> was enabled by default. I didn't check it earlier or ignored it.
> Ehhh dump thing.
> Disabling it solves the problem.
> Thanks for your time and tips which was most useful for me.

So you aren't using Jumbo frames though? (I've never tested with Jumbo

But Large Send was enabled in the DomU which was affecting
DomU->external traffic, but not DomU->DomX traffic right?

I'd still like to find what the root cause is (netback bug? GPLPV bug?
Physical Ethernet device driver bug?) but I'm glad it's working for you


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