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[Qemu-discuss] libvirt-qemu/kvm passthru w/Intel 82598EB

From: laurence.schuler
Subject: [Qemu-discuss] libvirt-qemu/kvm passthru w/Intel 82598EB
Date: Tue, 3 Sep 2013 16:30:06 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8

 I was advised to post this RFI here (from Libvirtd list). Does anyone
have any thoughts on where to proceed with debugging this? I'm not a
kernel/driver dev, but it seems like it's something in either qemu/kvm,
libvirt or the ixgbe driver

 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).

I've tried a few tweaks I've discovered via googling, but nothing seems
to help. (run libvirt as root, set privilege mode, etc)

For validation, I have the same card in Dell hosts running Centos 6
natively and they get an avg rtt of .06ms or better. Furthemore the Dell
will contact the dom1 but the connection has rtt avg times of about 6ms.

With the ethernet interface on the motherboard of the Apple Xserve, I
will see rtt times of .06ms within the dom1's, so I think this points to
a problem with the Intel card passthru usage, perhaps interrupt handling?.

Does anyone know if I need to set any special options for the ixgbe
driver under libvirt?


Laurence Schuler (Larry)                       address@hidden
Systems Support                                       ADNET Systems, Inc
Scientific Visualization Studio                 http://svs.gsfc.nasa.gov
NASA/Goddard Space Flight Center, Code 606.4       phone: 1-301-286-1799
Greenbelt, MD 20771                                  fax: 1-301-286-1634
Note: I am not a government employee and have no authority to obligate
any federal, state or local government to perform any action or payment.FC949ES

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