netdev - Re: Regression: too many packets with incorrect checksum

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Message-ID: <518A41CA.3030804@linux.intel.com>
Date:	Wed, 08 May 2013 05:15:06 -0700
From:	PJ Waskiewicz <peter.p.waskiewicz.jr@...ux.intel.com>
To:	Cong Wang <amwang@...hat.com>
CC:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: Regression: too many packets with incorrect checksum

On 5/8/2013 4:51 AM, Cong Wang wrote:
> Hi, all
>
> The latest -net tree has some regression, I saw too many packets with
> incorrect checksum from tcpdump inside a KVM guest, see the bottom.
> (firewall is turned off on both sides.)
>
> It seems this is not related with drivers, I tried virtio and e1000,
> both have the same problem. And UDP has the problem too. But turning off
> tx-checksum by `ethtool -K eth0 tx off` makes the problem disappear
> (just turning off TSO or GSO doesn't make any difference).
>
> I can provide other information if you need.

Reproduce on bare metal, non-KVM?

-PJ
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