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Tsirkin" To: Michael Galaxy Cc: Sean Hefty , Peter Xu , "Gonglei (Arei)" , "qemu-devel@nongnu.org" , "yu.zhang@ionos.com" , "elmar.gerdes@ionos.com" , zhengchuan , "berrange@redhat.com" , "armbru@redhat.com" , "lizhijian@fujitsu.com" , "pbonzini@redhat.com" , Xiexiangyou , "linux-rdma@vger.kernel.org" , "lixiao (H)" , "jinpu.wang@ionos.com" , Wangjialin Subject: Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API Message-ID: <20240929182538-mutt-send-email-mst@kernel.org> References: <1717503252-51884-1-git-send-email-arei.gonglei@huawei.com> <20240827165643-mutt-send-email-mst@kernel.org> <027c4f24-f515-4fdb-8770-6bf2433e0f43@akamai.com> <84c74f1a95a648b18c9d41b8c5ef2f60@huawei.com> <0730fa9b-49cd-46e4-9264-afabe2486154@akamai.com> <20240929141323-mutt-send-email-mst@kernel.org> <46f8e54e-64a4-4d90-9b02-4fd699b54e41@akamai.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46f8e54e-64a4-4d90-9b02-4fd699b54e41@akamai.com> On Sun, Sep 29, 2024 at 03:26:58PM -0500, Michael Galaxy wrote: > > On 9/29/24 13:14, Michael S. Tsirkin wrote: > > !-------------------------------------------------------------------| > > This Message Is From an External Sender > > This message came from outside your organization. > > |-------------------------------------------------------------------! > > > > On Sat, Sep 28, 2024 at 12:52:08PM -0500, Michael Galaxy wrote: > > > A bounce buffer defeats the entire purpose of using RDMA in these cases. > > > When using RDMA for very large transfers like this, the goal here is to map > > > the entire memory region at once and avoid all CPU interactions (except for > > > message management within libibverbs) so that the NIC is doing all of the > > > work. > > > > > > I'm sure rsocket has its place with much smaller transfer sizes, but this is > > > very different. > > To clarify, are you actively using rdma based migration in production? Stepping up > > to help maintain it? > > > Yes, both Huawei and IONOS have both been contributing here in this email > thread. > > They are both using it in production. > > - Michael Well, any plans to work on it? for example, postcopy does not really do zero copy last time I checked, there's also a long TODO list. -- MST