[ovs-discuss] Intel PCI-X NIC does not work

Jesse Gross jesse at nicira.com
Wed Sep 5 01:15:54 UTC 2012

On Tue, Sep 4, 2012 at 11:17 AM, Timm Essigke
<Timm.Essigke at uni-bayreuth.de> wrote:
> Dear OpenVSwitch users and developers,
> I use openvswitch on some of my servers since a few months and I am very
> happy with it. Thank you for this great software!
> Now, I encountered a strange problem:
> I have a server with a Intel Pro/1000 MT Dual Port NIC (PWLA8492MT, 82546GB
> chip) which works fine when I configure it directly or with vlan/bridging as
> it is in the kernel for some time. If I configure openvswitch, I can see
> traffic with tcpdump, but not send any packages. ARP requests are answered
> by the card/server, but never leave it. Other NICs in the server (Intel
> 80003ES2 dual port 1GBit on-board, Intel 82599EB dual port 10GBit PCI-e
> Adapter X520-2) work fine. I replaced the PCI-X card by a similar one (also
> 82546GB chip) which also does not work. Instead a PCI-e Intel Pro/1000 PT
> Dual Port NIC (EXPI9402PT, probably 82571GB chip) works.
> I removed all other PCI-X cards and tried different slots without success.
> I assume it is a bug in the NIC firmware of 82546GB chips. Has anyone a
> working PCI-X card (with this chip or another one)?
> Has a developer an idea what openvswitch does different than the old kernel
> code which could cause such an effect? I would like to test a patch!

My guess is that it is related to the driver more than the firmware.
However, I've never heard of this problem before.  If you think it is
related to the driver/firmware then you might want to contact the
Intel developers on the e1000 mailing list.

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