From: Tetsuya Mukawa <mukawa@igel.co.jp>
To: "Xie, Huawei" <huawei.xie@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] vhost-user technical isssues
Date: Fri, 14 Nov 2014 11:52:55 +0900 [thread overview]
Message-ID: <54656E87.8090801@igel.co.jp> (raw)
In-Reply-To: <C37D651A908B024F974696C65296B57B0F30265D@SHSMSX101.ccr.corp.intel.com>
Hi Xie,
(2014/11/14 9:22), Xie, Huawei wrote:
>> I think so. I guess we need to consider 2 types of restarting. One is
>> virtio-net driver restarting, the other is vhost-user backend
>> restarting. But, so far, it's nice to start to think about virtio-net
>> driver restarting first. Probably we need to implement a way to let
>> vhost-user backend know virtio-net driver is restarted. I am not sure
>> what is good way to let vhost-user backend know it. But how about
>> followings RFC?
> I checked your code today, and didn't find the logic to deal with virtio reconfiguration.
Yes.
I guess the first implementation of librte_vhost may just replace
vhost-example function.
Probably vhost-example doesn't think about restarting.
Because of this, I haven't implemented.
> My thought without new message support: When vhost-user receives
> another configuration message since last time it is ready for
> processing, then we could release it from data core, and process the
> next reconfiguration message, and then re-add it to data core when it
> is ready again(check new kick message as before). The candidate
> message is set_mem_table. It is ok we keep the device on data core
> until we receive the new reconfiguration message. Just waste vhost
> some cycles checking the avail idx.
For example, let's assume DPDK app1 is started on guest with virtio-net
device port.
If DPDK app1 on guest is stopped, and other DPDK app2 on guest is
started without virtio-net device port.
Hugepages DPDK app1 used will be used by DPDK app2.
It means the memory accessed by vhost-user backend might be changed by
DPDK app2.
And vhost-user backend will be crashed.
So I guess we need some kinds of reset message.
Thanks,
Tetsuya
next prev parent reply other threads:[~2014-11-14 2:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-11 21:37 Xie, Huawei
2014-11-12 4:12 ` Tetsuya Mukawa
2014-11-13 6:30 ` Linhaifeng
2014-11-14 2:30 ` Tetsuya Mukawa
2014-11-14 3:13 ` Linhaifeng
2014-11-14 3:40 ` Tetsuya Mukawa
2014-11-14 4:05 ` Tetsuya Mukawa
2014-11-14 4:42 ` Linhaifeng
2014-11-14 5:12 ` Tetsuya Mukawa
2014-11-14 5:30 ` Linhaifeng
2014-11-14 6:57 ` Tetsuya Mukawa
2014-11-14 10:59 ` Xie, Huawei
2014-11-17 6:14 ` Tetsuya Mukawa
2014-11-14 0:22 ` Xie, Huawei
2014-11-14 2:52 ` Tetsuya Mukawa [this message]
2014-11-15 1:42 ` Xie, Huawei
2014-11-13 6:12 ` Linhaifeng
2014-11-13 6:27 ` Linhaifeng
2014-11-14 1:28 ` Xie, Huawei
2014-11-14 2:24 ` Linhaifeng
2014-11-14 2:35 ` Tetsuya Mukawa
2014-11-14 6:24 ` Xie, Huawei
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