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a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=GoEa3M9JfhUA:10 a=k6aI6Z0B8vvFVdieJA0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: jPsCdHIfmmbVxM-Ys8aFMbpqfcb3OAGB X-Proofpoint-GUID: jPsCdHIfmmbVxM-Ys8aFMbpqfcb3OAGB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjIwMDA3OCBTYWx0ZWRfX98aCPc0Pa78z 4KQTh1ya7yk5znE+HM2GRPY+0OyZzcI0Ljj9+uRiA9N2h6eKDMJKCTdZZVaWcF+ijoynxrsf4hp M4otBOtx6fPc72ANPIQDXZXwL6TfY/aP2QckNmmXvaqFGTn1MTw2XOz+GK52If5vFm1Oq4OrjFc xo75RQUTXIXeEZktraH+jXO4106FDyiS7inzXJHSFrH50OtSkJGAH0muu4VydnZtwy0HznxB63H Pwsnz3YQzjjHDqoBDmfmSIxdVLM8qq0N2jbUmkqc6YWqA/s1OH8NFNC8DfjvXpIMyLOKPQPwJdl WMPkV83fhbbO6ybmTS4eeExlmQ1SnVxnBb4L1HKHu7sabMnteXSIiORrrgpY4blqsf4iarni51D 6UA5EHoVefC7mBW1CfkeozqeaiWNLMOdqn9lsF9jL0qe6Mpok5wPKoiCiUfKLvf4v6Du98uN On 19/06/2025 20:35, Aaron Tomlin wrote: > On Wed, Jun 18, 2025 at 07:49:16AM +0100, John Garry wrote: >> BTW, if you use taskset to set the affinity of a process and ensure that >> /sys/block/xxx/queue/rq_affinity is set so that we complete on same CPU as >> submitted, then I thought that this would ensure that interrupts are not >> bothering other CPUs. > Hi John, > > I'm trying to understand this better. If I'm not mistaken, modifying > /sys/block/[device]/queue/rq_affinity impacts where requests are processed. > Could you clarify how this would prevent an IRQ from being delivered to an > isolated CPU? If you echo 2 > /sys/block/[device]/queue/rq_affinity, then completions will occur on the same CPU which their originated. And through taskset, if you keep the processes generating traffic on a certain group of CPUs, then other CPUs should not see any loading from those same processes. I am assuming that there is a one-to-one CPU <-> HW queue relationship. That's my unverified idea...