Hi all, Looking through the blk-mq code I tried to figure out if and how the driver is supposed to set any interrupt affinity when block-mq is enabled. Thing is, for your typical driver you would set the interrupt affinity during init time (eg for SCSI drivers during host_alloc). But to set the interrupt affinity you'd need the cpumask, which is only populated way later during queue setup. So now I got two bad choices: either I have to delay setting the interrupt affinity until after the queue is created, making things awkward with several queues, or I have to out-guess the blk-mq mapping algorithm and set the interrupt affinity prior to queue setup. Tests with the lpfc driver found that one absolutely _does_ want to do irq affinity; not doing so limits the performance to single-queue results. So what is the expected strategy here? Or am I just too stupid to find it? Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
