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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: Wed, 15 Sep 2010 07:12:41 +0200	[thread overview]
Message-ID: <20100915051241.GA25340@redhat.com> (raw)
In-Reply-To: <1284492983.13351.95.camel@localhost.localdomain>

On Tue, Sep 14, 2010 at 12:36:23PM -0700, Shirley Ma wrote:
> On Tue, 2010-09-14 at 21:01 +0200, Michael S. Tsirkin wrote:
> > > > I think that you should be able to simply combine
> > > > the two drivers together, add an ioctl to
> > > > enable/disable zero copy mode of operation. 
> > > 
> > > That could work. But what's the purpose to have two drivers if one
> > > driver can handle it?
> > > 
> > > Thanks
> > > Shirley
> > 
> > This was just an idea: I thought it's a good way for people interested
> > in this zero copy thing to combine forces and avoid making
> > the same mistakes, but it's not a must of course. 
> 
> Ok, I will make a simple patch by reusing Xiaohui's some vhost code on
> handling vhost_add_used_and_signal() to see any performance changes.
> 
> The interesting thing here when I run 32 instances netperf/netserver I
> didn't see any issue w/i this patch.
> 
> Thanks
> Shirley

Yes, I agree this patch is useful for demo purposes:
simple, and shows what kind of performance gains
we can expect for TX.

-- 
MST

  reply	other threads:[~2010-09-15  5:18 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
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 [this message]
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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