netdev - Re: "virtio-net: enable multiqueue by default" in linux-next breaks networking on GCE

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Date:   Wed, 14 Dec 2016 12:24:43 +0800
From:   Wei Xu <wexu@...hat.com>
To:     "Theodore Ts'o" <tytso@....edu>
Cc:     jasowang@...hat.com, netdev@...r.kernel.org, mst@...hat.com,
        nhorman@...driver.com, davem@...emloft.net
Subject: Re: "virtio-net: enable multiqueue by default" in linux-next breaks
 networking on GCE

On 2016年12月14日 03:44, Theodore Ts'o wrote:
> Jason's patch fixed the issue, so I think we have the proper fix, but
> to answer your questions:
>
> On Wed, Dec 14, 2016 at 01:46:44AM +0800, Wei Xu wrote:
>>
>> Q1:
>> Which distribution are you using for the GCE instance?
>
> The test appliance is based on Debian Jessie.
>
>> Q2:
>> Are you running xfs test as an embedded VM case, which means XFS test
>> appliance is also a VM inside the GCE instance? Or the kernel is built
>> for the instance itself?
>
> No, GCE currently doesn't support running nested VM's (e.g., running
> VM's inside GCE).  So the kernel is built for the instance itself.
> The way the test appliance works is that it initially boots using the
> Debian Jessie default kernel and then we kexec into the kernel under
> test.
>
>> Q3:
>> Can this bug be reproduced for kvm-xfstests case? I'm trying to set up
>> a local test bed if it makes sense.
>
> You definitely can't do it out of the box -- you need to build the
> image using "gen-image --networking", and then run "kvm-xfstests -N
> shell" as root.  But the bug doesn't reproduce on kvm-xfstests, using
> a 4.9 host kernel and linux-next guest kernel.
>

OK, thanks a lot.

BTW, although this is a guest issue, is there anyway to view the GCE
host kernel or qemu(if it is) version?

>
> Cheers,
>
> 					- Ted
>