netdev - Re: [E1000-devel] Questions about crashes and GRO

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Message-ID: <a200c09a-ec13-9463-82a3-e0fb7e5140ba@computer.org>
Date:   Mon, 20 Nov 2017 15:35:14 -0800
From:   Sarah Newman <sarah.newman@...puter.org>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     e1000-devel@...ts.sf.net, Netdev <netdev@...r.kernel.org>
Subject: Re: [E1000-devel] Questions about crashes and GRO

On 11/20/2017 02:56 PM, Alexander Duyck wrote:
> On Mon, Nov 20, 2017 at 2:38 PM, Sarah Newman <sarah.newman@...puter.org> wrote:
>> On 11/20/2017 08:36 AM, Alexander Duyck wrote:
>>> Hi Sarah,
>>>
>>> I am adding the netdev mailing list as I am not certain this is an
>>> i350 specific issue. The traces themselves aren't anything I recognize
>>> as an existing issue. From what I can tell it looks like you are
>>> running Xen, so would I be correct in assuming you are bridging
>>> between VMs? If so are you using any sort of tunnels on your network,
>>> if so what type? This information would be useful as we may be looking
>>> at a bug in a tunnel offload for GRO.
>>
>> Yes, there's bridging. The traffic on the physical device is tagged with vlans and the bridges use untagged traffic. There are no tunnels. I do not
>> own the VMs traffic.
>>
>> Because I have only seen this on a single server with unique hardware, I think it's most likely related to the hardware or to a particular VM on that
>> server.
> 
> So I would suspect traffic coming from the VM if anything. The i350 is
> a pretty common device. If we were seeing issues specific to it > would expect we would have more reports than just the one so far.

My confusion was primarily related to the release notes for an older version of a different intel driver.

But regarding traffic coming from a VM, the backtraces both include igb_poll. Doesn't that mean the problem is related to inbound traffic on the igb
device and not traffic direct from a local VM?

--Sarah