linux-kernel - Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel

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Message-ID: <1284480025.13351.49.camel@localhost.localdomain>
Date:	Tue, 14 Sep 2010 09:00:25 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Avi Kivity <avi@...hat.com>,
	David Miller <davem@...emloft.net>, xiaohui.xin@...el.com,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host
 kernel

On Tue, 2010-09-14 at 17:22 +0200, Michael S. Tsirkin wrote:
> I would expect this to hurt performance significantly.
> We could do this for asynchronous requests only to avoid the
> slowdown. 

Is kiocb in sendmsg helpful here? It is not used now.

Shirley

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