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Re: [Xen-devel] [PATCH] Network Checksum Removal

  • To: Jon Mason <jdmason@xxxxxxxxxx>
  • From: Bin Ren <bin.ren@xxxxxxxxx>
  • Date: Mon, 23 May 2005 23:05:51 +0100
  • Cc: Andrew Theurer <habanero@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 23 May 2005 22:05:15 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On 5/23/05, Jon Mason <jdmason@xxxxxxxxxx> wrote:
> I get the following domU->dom0 throughput on my system (using netperf3
> TCP_STREAM testcase):
> tx on   ~1580Mbps
> tx off  ~1230Mbps
> with my previous patch (on Friday's build), I was seeing the following:
> with patch      ~1610Mbps
> no patch                ~1100Mbps

I suppose you are running dom0 and dom1 on different CPUs. Is it
possible for you to pin them to the same CPU and get the numbers
again? It'll show how much overhead context switches and CPU share
halved could incur.

Thanks a lot,

> The slight difference between the two might be caused by the changes that were
> incorporated in xen between those dates.  If you think it is worth the time,
> I can back port the latest patch to Friday's build to see if that makes a
> difference.
> Thanks,
> Jon
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