From: keith.busch@intel.com (Keith Busch)
Subject: NVMe and IRQ Affinity
Date: Tue, 2 Feb 2016 23:45:40 +0000 [thread overview]
Message-ID: <20160202234540.GA21046@localhost.localdomain> (raw)
In-Reply-To: <CACo6K_bSDJwt61mnKDpYvcXjCVA9UKGO17pythzcJ8Rnjh19sA@mail.gmail.com>
On Wed, Feb 03, 2016@12:31:22AM +0100, Mark Jacobson wrote:
> and noticed that the drives I'm working with (Samsung PM953) will by
> default only route interrupts to CPU0 despite having affinity for all
> cores and I figured I'd ask here since that seemed like a driver
> issue.
Sounds like the affinity hints are either messed up in this distro, or
just not being used by irqbalance. Could you run the following script
and send the output?
---
cat /sys/block/nvme0n1/mq/*/cpu_list
for i in $(grep nvme0q /proc/interrupts | cut -d":" -f1 | sed "s/ //g"); do
echo "IRQ: $i";
echo -n "HINT: " && cat /proc/irq/$i/affinity_hint
echo -n "SMP: " && cat /proc/irq/$i/smp_affinity
done
next prev parent reply other threads:[~2016-02-02 23:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 23:31 NVMe and IRQ Affinity Mark Jacobson
2016-02-02 23:45 ` Keith Busch [this message]
2016-02-02 23:50 ` Mark Jacobson
2016-02-02 23:58 ` Keith Busch
2016-02-03 0:13 ` Mark Jacobson
2016-02-03 14:30 ` Keith Busch
2016-02-03 18:31 ` Azher Mughal
2016-02-03 18:58 ` Keith Busch
2016-02-03 16:14 ` Kim Kyungsan
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