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From: Shirley Ma <mashirle@us.ibm.com>
To: "Dong, Eddie" <eddie.dong@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	"Xin, Xiaohui" <xiaohui.xin@intel.com>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"mst@redhat.com" <mst@redhat.com>,
	"mingo@elte.hu" <mingo@elte.hu>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
	"jdike@linux.intel.com" <jdike@linux.intel.com>
Subject: RE: [RFC PATCH v8 00/16] Provide a zero-copy method on KVM virtio-net.
Date: Wed, 04 Aug 2010 10:09:05 -0700	[thread overview]
Message-ID: <1280941745.3391.15.camel@localhost.localdomain> (raw)
In-Reply-To: <1A42CE6F5F474C41B63392A5F80372B228FCE7B1@shsmsx501.ccr.corp.intel.com>

Hello Eddie,

On Wed, 2010-08-04 at 10:06 +0800, Dong, Eddie wrote:
> But zero-copy is a Linux generic feature that can be used by other
> VMMs as well if the BE service drivers want to incorporate.  If we can
> make mp device VMM-agnostic (it may be not yet in current patch), that
> will help Linux more.

First other VMMs support tun/tap which provides most funcs but not zero
copy.

Second mp patch only supports zero copy for vhost now, macvtap zero copy
will not be used by vhost only.

Third, the current mp device doesn't fallback to copy when failure.

So you can extend mp device to support all funcs, but the usage/funcs
will be similar with macvtap, then either mp device will replace macvtap
in the future with similar funcs or we can use enhance macvtap to
support zero copy. It is not necessary to have both in Linux.

I think it's better to implement zero copy in macvtap, tun/tap instead
of creating a new mp device.

Thanks
Shirley


  parent reply	other threads:[~2010-08-04 17:09 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-29 11:14 [RFC PATCH v8 00/16] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-07-29 11:14 ` [RFC PATCH v8 01/16] Add a new structure for skb buffer from external xiaohui.xin
2010-07-29 11:14   ` [RFC PATCH v8 02/16] Add a new struct for device to manipulate external buffer xiaohui.xin
2010-07-29 11:14     ` [RFC PATCH v8 03/16] Add a ndo_mp_port_prep func to net_device_ops xiaohui.xin
2010-07-29 11:14       ` [RFC PATCH v8 04/16] Add a function make external buffer owner to query capability xiaohui.xin
2010-07-29 11:14         ` [RFC PATCH v8 05/16] Add a function to indicate if device use external buffer xiaohui.xin
2010-07-29 11:14           ` [RFC PATCH v8 06/16] Use callback to deal with skb_release_data() specially xiaohui.xin
2010-07-29 11:14             ` [RFC PATCH v8 07/16] Modify netdev_alloc_page() to get external buffer xiaohui.xin
2010-07-29 11:14               ` [RFC PATCH v8 08/16] Modify netdev_free_page() to release " xiaohui.xin
2010-07-29 11:14                 ` [RFC PATCH v8 09/16] Don't do skb recycle, if device use " xiaohui.xin
2010-07-29 11:14                   ` [RFC PATCH v8 10/16] Add a hook to intercept external buffers from NIC driver xiaohui.xin
2010-07-29 11:14                     ` [RFC PATCH v8 11/16] Add header file for mp device xiaohui.xin
2010-07-29 11:14                       ` [RFC PATCH v8 13/16] Add a kconfig entry and make entry " xiaohui.xin
2010-07-29 11:14                         ` [RFC PATCH v8 12/16] Add mp(mediate passthru) device xiaohui.xin
2010-07-29 11:14                           ` [RFC PATCH v8 14/16] Provides multiple submits and asynchronous notifications xiaohui.xin
2010-07-29 11:14                             ` [RFC PATCH v8 15/16] An example how to modifiy NIC driver to use napi_gro_frags() interface xiaohui.xin
2010-07-29 11:14                               ` [RFC PATCH v8 16/16] An example how to alloc user buffer based on " xiaohui.xin
2010-07-29 22:31 ` [RFC PATCH v8 00/16] Provide a zero-copy method on KVM virtio-net Shirley Ma
2010-07-30  5:02   ` Avi Kivity
2010-07-30 15:46     ` Shirley Ma
2010-08-01  8:18       ` Avi Kivity
2010-08-02 16:01         ` Shirley Ma
2010-08-02 16:11           ` Avi Kivity
2010-08-02 16:25             ` Shirley Ma
2010-08-02 16:32               ` Avi Kivity
2010-08-11  3:28                 ` Shirley Ma
2010-07-30  8:53   ` Xin, Xiaohui
2010-07-30 15:51     ` Shirley Ma
2010-07-31  9:30       ` Arnd Bergmann
2010-08-04  2:06         ` Dong, Eddie
2010-08-04  8:56           ` Arnd Bergmann
2010-08-04 17:09           ` Shirley Ma [this message]
2010-08-01  8:31   ` Michael S. Tsirkin
2010-08-02 16:04     ` Shirley Ma
2010-08-02 16:10     ` Shirley Ma
2010-08-03  8:48   ` Xin, Xiaohui
2010-08-03 15:50     ` Shirley Ma
2010-08-05  8:52 ` Xin, Xiaohui

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