netdev - Re: TCP stalls with 802.3ad + bridge + kvm guest

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Message-ID: <CAEuXFExg2X9r0zE8wUs9Npd7jPUN2WHbyJcnH6eT_23f2DoPjw@mail.gmail.com>
Date:	Fri, 3 Aug 2012 22:04:02 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Peter Samuelson <psamuelson@...lder.net>
Cc:	Jay Vosburgh <fubar@...ibm.com>, netdev@...r.kernel.org,
	jgoerzen@...lder.net
Subject: Re: TCP stalls with 802.3ad + bridge + kvm guest

On Wed, Aug 1, 2012 at 7:41 AM, Peter Samuelson <psamuelson@...lder.net> wrote:
>
>   [Peter Samuelson]
>> >    ixgbe [10 Gbit port] -- bonding [802.3ad] -- bridge -- KVM guest
>> >
>> >It all works, except that with some flows in the KVM guest - I
>> >can reproduce using smbclient - transfers keep stalling, such that I'm
>> >averaging well under 1 MB/s.  Should be more like 100 MB/s.
>> >
>> >Oddly, this only occurs when both the 802.3ad and KVM are used:

is it because offloads are enabled?  I had to disable several of them
to get my virtual machines to work on both igb and ixgbe interfaces, I
haven't gone any further to isolate why.

try
# ethtool -K ethx tso off gso off lro off
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