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[Xen-devel] PCI-E networking

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Apparao, Padmashree K" <padmashree.k.apparao@xxxxxxxxx>
  • Date: Tue, 10 Oct 2006 23:26:03 -0700
  • Delivery-date: Tue, 10 Oct 2006 23:27:42 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acbs/iB0xSvRNeDnTreWDHRbAMXFCg==
  • Thread-topic: PCI-E networking



I see a weird problem with networking under Xen. I am using 2 dual ports PCI-e nics in my platform and a single PCI-X nic. Each PCI-E nic shares an irq. Each port is on a different subnet.


In native linux I can get line rate in each port.

In Xen (custome xen-unstable)  however, a ping on each subnet is very slooow. A ping takes about 3000ms or even more.


In fact I downloaded the Xen 3.0.2-3 testing build of xen and I see the problem there too. Has anyone seen this kind of behavior? Is this related to the interrupt sharing of the ports?





-          Padma






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