netdev - Re: [PATCH net-next 2/2] openvswitch: Use zerocopy if applicable when performing the upcall

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Message-ID: <CAEP_g=_SCmqik=vOQeNF_z7VskG15rovBOLMFx6wPKru0CBDQQ@mail.gmail.com>
Date:	Fri, 24 May 2013 17:08:13 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Thomas Graf <tgraf@...g.ch>, netdev <netdev@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCH net-next 2/2] openvswitch: Use zerocopy if applicable when
 performing the upcall

On Fri, May 24, 2013 at 3:34 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2013-05-24 at 15:18 -0700, Jesse Gross wrote:
>
>> Offloads are supported. What I want to know is how they affect
>> performance with this change.
>
> Hmm, I do not understand why you are checksumming then.

Checksum offloading is an internal kernel optimization, so the goal is
to shield userspace from needing to know about it.

> skb_copy_and_csum_dev() is a killer.

What's the alternative?
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