[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] SR-IOV problems - HVM cannot access network
On Wed, 2 Mar 2011, David white wrote: > > On Wed, 2 Mar 2011, Stefano Stabellini wrote: > > > On Wed, 2 Mar 2011, David White wrote: > > > Thanks for your help so far. > > > > > > Ubuntu Maverick is only running in the guest HVM domains. > > > > > > I have two boards I am testing with, both with Intel 5520 chipset. I'm > > > using > > > two 82576 nics from two different vendors, one attached to either board. > > > Both > > > systems have AMI bios. One system (call it systemA) has bios options for > > > both > > > VT-d and SR-IOV, and both are enabled, as is I/OAT. The other system > > > (systemB) > > > has bios options for VT-d and "Coherency support" (which seemed to help me > > > enumerate the VFs), and both are enabled (no mention of I/OAT). > > > > > > SystemA runs Debian Squeeze and the xen kernel, vmm and tools from that > > > distro. > > > SystemB runs Fedora14 with the well-known "jeremy" kernel > > > (http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=xen/stable-2.6.32.x), > > > and xen-4.0.1 hypervisor built from source (unaltered). > > > > > > Both systems are experiencing the same behavior. > > > > > > attached are dom0 and hvm ethregs output for the VF using '-o -m' > > > flags. This one was taken from the Debian host ("systemA") > > > > could you please try adding > > > > acpi=0 > > > > in your VM config file? > > > > Hm, ok that seemed to do the trick, as far as getting the VFs up on the > network. > Thank you very much for testing this, it proves that the recent problems with VF passthrough and HVM Linux guests are the same issue reported here: http://marc.info/?l=xen-devel&m=129847075105008&w=2 and here: http://marc.info/?l=xen-devel&m=129891005422870&w=2 > Is this by design or is it a workaround? Must I sacrifice acpi in my guest to > enable sr-iov? Does this come with a cost to I/O performance, since the guest > isn't using MSI? It is just a workaround. It shouldn't cost you any performance at all, but you won't be able to hot-plug or hot-unplug PCI devices to your guests. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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