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[Xen-devel] checksum errors with large send

  • To: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
  • From: James Harper <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Thu, 14 Nov 2013 07:26:07 +0000
  • Accept-language: en-AU, en-US
  • Delivery-date: Thu, 14 Nov 2013 07:26:52 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Thread-index: Ac7hBveU6BjP9FW3Sj6ngdWBiBLQGA==
  • Thread-topic: checksum errors with large send

A user has reported a problem with GPLPV with large packets, having looked at a 
tcpdump I can see that a large packet (10k) is being sent, but the resulting 
packets received at the other end have incorrect TCP checksums. The checksums 
of the received packets are all different to each other, so something is making 
an attempt to calculate a checksum, which I assume is the hardware. In theory, 
the windows 

It all works fine on my systems - I get line speed on gigabit hardware with no 
bad checksums, so I can't think what is going on, unless the way windows 
calculates the pseudoheader  checksum isn't compatible with what Linux wants...

Any suggestions?



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