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[204.195.123.141]) by smtp.gmail.com with ESMTPSA id i4-20020aa787c4000000b006e6ab7cb10esm325263pfo.186.2024.03.13.20.05.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Mar 2024 20:05:47 -0700 (PDT) Date: Wed, 13 Mar 2024 20:05:45 -0700 From: Stephen Hemminger To: Shradha Gupta Cc: Jakub Kicinski , Haiyang Zhang , Shradha Gupta , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "netdev@vger.kernel.org" , Eric Dumazet , Paolo Abeni , Ajay Sharma , Leon Romanovsky , Thomas Gleixner , Sebastian Andrzej Siewior , KY Srinivasan , Wei Liu , Dexuan Cui , Long Li , Michael Kelley Subject: Re: [PATCH] net :mana : Add per-cpu stats for MANA device Message-ID: <20240313200545.656f6dd6@hermes.local> In-Reply-To: <20240314025720.GA13853@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> References: <1709823132-22411-1-git-send-email-shradhagupta@linux.microsoft.com> <20240307072923.6cc8a2ba@kernel.org> <20240307090145.2fc7aa2e@kernel.org> <20240308112244.391b3779@kernel.org> <20240311041950.GA19647@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> <20240314025720.GA13853@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 13 Mar 2024 19:57:20 -0700 Shradha Gupta wrote: > Following is the data we can share: > > Default interrupts affinity for each queue: > > 25: 1 103 0 2989138 Hyper-V PCIe MSI 4138200989697-edge mana_q0@pci:7870:00:00.0 > 26: 0 1 4005360 0 Hyper-V PCIe MSI 4138200989698-edge mana_q1@pci:7870:00:00.0 > 27: 0 0 1 2997584 Hyper-V PCIe MSI 4138200989699-edge mana_q2@pci:7870:00:00.0 > 28: 3565461 0 0 1 Hyper-V PCIe MSI 4138200989700-edge mana_q3 > @pci:7870:00:00.0 > > As seen the CPU-queue mapping is not 1:1, Queue 0 and Queue 2 are both mapped > to cpu3. From this knowledge we can figure out the total RX stats processed by > each CPU by adding the values of mana_q0 and mana_q2 stats for cpu3. But if > this data changes dynamically using irqbalance or smp_affinity file edits, the > above assumption fails. irqbalance is often a bad idea. In the past, doing one shot balancing at startup was a better plan.