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Tue, 16 Jul 2024 10:36:47 +0000 Message-ID: Date: Tue, 16 Jul 2024 12:36:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] nvmet: support polling task for RDMA and TCP To: Ping Gan , sagi@grimberg.me, hch@lst.de, kch@nvidia.com, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org Cc: ping.gan@dell.com References: <12556163-9efa-461f-826d-264350f4ca58@grimberg.me> <20240704081015.63584-1-jacky_gam_2001@163.com> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20240704081015.63584-1-jacky_gam_2001@163.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.50 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; MX_GOOD(-0.01)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_SEVEN(0.00)[7]; FREEMAIL_TO(0.00)[163.com,grimberg.me,lst.de,nvidia.com,lists.infradead.org,vger.kernel.org]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[163.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:dkim,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Rspamd-Queue-Id: 2EFD21F8AC X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240716_033650_198157_5FFF47F9 X-CRM114-Status: GOOD ( 12.50 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 7/4/24 10:10, Ping Gan wrote: >> On 02/07/2024 13:02, Ping Gan wrote: [ .. ] >>> And the bandwidth of a node is only 3100MB. While we used the patch >>> and enable 6 polling task, the bandwidth can be 4000MB. It's a good >>> improvement. >> >> I think you will see similar performance with unbound workqueue and >> rps. > > Yes, I remodified the nvmet-tcp/nvmet-rdma code for supporting unbound > workqueue, and in same prerequisites of above to run test, and compared > the result of unbound workqueue and polling mode task. And I got a good > performance for unbound workqueue. For unbound workqueue TCP we got > 3850M/node, it's almost equal to polling task. And also tested > nvmet-rdma we get 5100M/node for unbound workqueue RDMA versus 5600M for > polling task, seems the diff is very small. Anyway, your advice is good. > Do you think we should submit the unbound workqueue patches for nvmet-tcp > and nvmet-rdma to upstream nvmet? Please do. I have been using pretty much the same patch during development of my nvme-tcp scalability patchset, and using WQ_UNBOUND definitely improves the situation here. Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich