From mboxrd@z Thu Jan 1 00:00:00 1970 From: keith.busch@intel.com (Keith Busch) Date: Tue, 2 Feb 2016 23:58:19 +0000 Subject: NVMe and IRQ Affinity In-Reply-To: References: <20160202234540.GA21046@localhost.localdomain> Message-ID: <20160202235818.GB21046@localhost.localdomain> On Wed, Feb 03, 2016@12:50:06AM +0100, Mark Jacobson wrote: > Output is below. I'm aware the distro hints are fairly invalid. They're all invalid. This kernel must have forked before the affinity hints were fixed for a blk-mq nvme driver. A more optimal affinity hint would match the mq's cpu_list, which is how it looks upstream. I guess your platform strongly prefers CPU 0 when allowed. You can either manually override the smp_affinity, use an out-of-tree driver with a fix and let irqbalance handle it.