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From: Qin Chuanyu <qinchuanyu@huawei•com>
To: "Michael S. Tsirkin" <mst@redhat•com>, <jasowang@redhat•com>
Cc: <kvm@vger•kernel.org>, <netdev@vger•kernel.org>, <qianhuibin@huawei•com>
Subject: Is fallback vhost_net to qemu for live migrate available？
Date: Tue, 27 Aug 2013 11:32:31 +0800	[thread overview]
Message-ID: <521C1DCF.5090202@huawei.com> (raw)

Hi all

I am participating in a project which try to port vhost_net on Xen。

By change the memory copy and notify mechanism ，currently virtio-net 
with vhost_net could run on Xen with good performance。TCP receive 
throughput of single vnic from 2.77Gbps up to 6Gps。In VM receive 
side，I instead grant_copy with grant_map + memcopy，it efficiently 
reduce the cost of grant_table spin_lock of dom0，So the hole server TCP 
performance from 5.33Gps up to 9.5Gps。

Now I am consider the live migrate of vhost_net on Xen，vhost_net use 
vhost_log for live migrate on Kvm，but qemu on Xen havn't manage the 
hole memory of VM，So I am trying to fallback datapath from vhost_net to 
qemu when doing live migrate ，and fallback datapath from qemu to
vhost_net again after vm migrate to new server。

My question is：
	why didn't vhost_net do the same fallback operation for live migrate on 
KVM，but use vhost_log to mark the dirty page？
	Is there any mechanism fault for the idea of fallback datapath from 
vhost_net to qemu for live migrate？

any question about the detail of vhost_net on Xen is welcome。

Thanks

next             reply	other threads:[~2013-08-27  3:33 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-27  3:32 Qin Chuanyu [this message]
2013-08-27  4:19 ` Is fallback vhost_net to qemu for live migrate available？ Michael S. Tsirkin
2013-08-27  7:04   ` Qin Chuanyu
2013-08-27  7:16     ` Michael S. Tsirkin
2013-08-27  7:22       ` Qin Chuanyu
2013-08-27  9:41     ` Wei Liu
2013-08-29 16:08 ` Anthony Liguori
2013-08-31  4:45   ` Qin Chuanyu
2013-09-02  3:19     ` Jason Wang
2013-09-02  7:57     ` Wei Liu
2013-09-02  8:11       ` Michael S. Tsirkin
2013-09-03  1:28       ` Qin Chuanyu
2013-09-03  8:40         ` Wei Liu
2013-09-03  8:55           ` Michael S. Tsirkin
2013-09-03  9:15             ` Wei Liu
2013-09-05 13:33             ` [Xen-devel] " Stefano Stabellini
2013-10-14  8:19   ` Qin Chuanyu

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