>-----Original Message----- >From: laurence.schuler [mailto:[email protected]] >Sent: Tuesday, September 03, 2013 1:36 PM >To: [email protected] >Subject: [E1000-devel] Fwd: libvirt-qemu/kvm passthru >w/Intel 82598EB > >Hello, > > I am trying to configure two identical systems with the >following setup. > >dom0: Centos 6 OS on Apple Xserve i7 server with PCI cards >for 4GB FC (LSI FC949ES) and 10GB Ethernet (Intel 82598EB) > >dom1: Centos 5 OS with passthru mode of PCI 4GB FC and 10GB >Ethernet (ixgbe and mptfc blacklisted in dom0) > >Everything starts ok, but networking in dom1 using the 10GB >interface has extremely high rtt w/ping tests (20-30ms avg).
>From the description above it seems you are using 82598 interfaces in both >dom0 and dom1, but you only see the issue on dom1? If that is the case, are >you only seeing the issue when dom1 runs Centos 5? What if you run dom1 with >Centos 6? I am not aware of any known issues with respect to passthru mode with qemu. The driver should see and use the network adapter as usual and there should be no special adjustments needed. We can try to reproduce this locally if you could provide some additional information such as the distros and kernel version of the host OS and the kernel versions in the VMs. Another thing to look at are any errors or warnings in dmesg when you bring the VMs up. Also for the failing interface it is worth taking a look at the stats while passing traffic via ethtool -S as this may give us an idea about what is causing the performance drop. Thanks, Emil ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58040911&iu=/4140/ostg.clktrk _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
