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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Shirley Ma <mashirle@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Avi Kivity <avi@redhat.com>,
	"Xin, Xiaohui" <xiaohui.xin@intel.com>,
	David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel
Date: Tue, 14 Sep 2010 18:29:52 +0200	[thread overview]
Message-ID: <20100914162952.GB13560@redhat.com> (raw)
In-Reply-To: <1284480025.13351.49.camel@localhost.localdomain>

On Tue, Sep 14, 2010 at 09:00:25AM -0700, Shirley Ma wrote:
> 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

Precisely. This is what the patch from Xin Xiaohui does.  That code
already seems to do most of what you are trying to do, right?

The main thing missing seems to be macvtap integration, so that we can fall back
on data copy if zero copy is unavailable?
How hard would it be to basically link the mp and macvtap modules
together to get us this functionality? Anyone?


-- 
MST

  reply	other threads:[~2010-09-14 16:36 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-13 20:43 [RFC PATCH 0/1] macvtap TX zero copy between guest and host kernel Shirley Ma
2010-09-13 20:47 ` RFC PATCH 1/2] macvtap: A new sock zero copy flag Shirley Ma
2010-09-13 20:48 ` [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel Shirley Ma
2010-09-14  3:17   ` David Miller
2010-09-14  9:12     ` Avi Kivity
2010-09-14 15:05       ` Shirley Ma
2010-09-14 15:21         ` Arnd Bergmann
2010-09-14 15:22           ` Michael S. Tsirkin
2010-09-14 16:00             ` Shirley Ma
2010-09-14 16:29               ` Michael S. Tsirkin [this message]
2010-09-14 17:02                 ` Shirley Ma
2010-09-14 18:27                   ` Michael S. Tsirkin
2010-09-14 18:49                     ` Shirley Ma
2010-09-14 19:01                       ` Michael S. Tsirkin
2010-09-14 19:20                         ` Shirley Ma
2010-09-15  5:31                           ` Michael S. Tsirkin
2010-09-14 19:36                         ` Shirley Ma
2010-09-15  5:12                           ` Michael S. Tsirkin
2010-09-15  6:21                             ` Shirley Ma
2010-09-15 10:10                               ` Michael S. Tsirkin
2010-09-15 14:52                                 ` Shirley Ma
2010-09-15 15:04                                   ` Michael S. Tsirkin
2010-09-15 15:39                                     ` Michael S. Tsirkin
2010-09-15 17:00                                       ` Shirley Ma
2010-09-15 17:30                                         ` Michael S. Tsirkin
2010-09-15 18:48                                           ` Shirley Ma
2010-09-29  3:24                                   ` Shirley Ma
2010-09-29  8:16                                     ` Michael S. Tsirkin
2010-09-29  8:28                                       ` Michael S. Tsirkin
2010-09-29 14:33                                         ` Shirley Ma
2010-09-29 14:56                                         ` Shirley Ma
2010-09-29 14:31                                       ` Shirley Ma
2010-09-29 14:37                                       ` Shirley Ma
2010-09-29 15:14                                     ` Michael S. Tsirkin
2010-09-29 15:23                                       ` Shirley Ma
2010-09-15  2:46                 ` Xin, Xiaohui
2010-09-15  9:58                   ` Michael S. Tsirkin
2010-09-16  8:18                     ` Xin, Xiaohui
2010-09-16 10:02                       ` Michael S. Tsirkin
2010-09-15  1:56           ` Xin, Xiaohui
2010-09-15  1:50         ` Xin, Xiaohui
2010-09-15  2:40           ` Shirley Ma
2010-09-15  2:55             ` Xin, Xiaohui
2010-09-15  5:27             ` Michael S. Tsirkin
2010-09-15  6:17               ` Shirley Ma
2010-09-14 12:05 ` [RFC PATCH 0/1] macvtap " Michael S. Tsirkin
2010-09-14 15:15   ` Shirley Ma

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