Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API

["Zhijian Li (Fujitsu)" <lizhijian@fujitsu.com>]

On 06/06/2024 19:31, Leon Romanovsky wrote:
> On Wed, Jun 05, 2024 at 10:00:24AM +0000, Gonglei (Arei) wrote:
>>
>>
>>> -----Original Message-----
>>> From: Michael S. Tsirkin [mailto:mst@redhat.com]
>>> Sent: Wednesday, June 5, 2024 3:57 PM
>>> To: Gonglei (Arei) <arei.gonglei@huawei.com>
>>> Cc: qemu-devel@nongnu.org; peterx@redhat.com; yu.zhang@ionos.com;
>>> mgalaxy@akamai.com; elmar.gerdes@ionos.com; zhengchuan
>>> <zhengchuan@huawei.com>; berrange@redhat.com; armbru@redhat.com;
>>> lizhijian@fujitsu.com; pbonzini@redhat.com; Xiexiangyou
>>> <xiexiangyou@huawei.com>; linux-rdma@vger.kernel.org; lixiao (H)
>>> <lixiao91@huawei.com>; jinpu.wang@ionos.com; Wangjialin
>>> <wangjialin23@huawei.com>
>>> Subject: Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API
>>>
>>> On Tue, Jun 04, 2024 at 08:14:06PM +0800, Gonglei wrote:
>>>> From: Jialin Wang <wangjialin23@huawei.com>
>>>>
>>>> Hi,
>>>>
>>>> This patch series attempts to refactor RDMA live migration by
>>>> introducing a new QIOChannelRDMA class based on the rsocket API.
>>>>
>>>> The /usr/include/rdma/rsocket.h provides a higher level rsocket API
>>>> that is a 1-1 match of the normal kernel 'sockets' API, which hides
>>>> the detail of rdma protocol into rsocket and allows us to add support
>>>> for some modern features like multifd more easily.
>>>>
>>>> Here is the previous discussion on refactoring RDMA live migration
>>>> using the rsocket API:
>>>>
>>>> https://lore.kernel.org/qemu-devel/20240328130255.52257-1-philmd@linar
>>>> o.org/
>>>>
>>>> We have encountered some bugs when using rsocket and plan to submit
>>>> them to the rdma-core community.
>>>>
>>>> In addition, the use of rsocket makes our programming more convenient,
>>>> but it must be noted that this method introduces multiple memory
>>>> copies, which can be imagined that there will be a certain performance
>>>> degradation, hoping that friends with RDMA network cards can help verify,
>>> thank you!
>>>
>>> So you didn't test it with an RDMA card?
>>
>> Yep, we tested it by Soft-ROCE.
> 
> Does Soft-RoCE (RXE) support live migration?


Yes, it does


Thanks
Zhijian

> 
> Thanks
>