From: keith.busch@intel.com (Keith Busch)
Subject: IRQ and CPU Affinity on new Kernels
Date: Thu, 3 Dec 2015 23:50:41 +0000 [thread overview]
Message-ID: <20151203235041.GA3565@localhost.localdomain> (raw)
In-Reply-To: <CAMjVwgQRoPi8Chta3sXdxAZX3KCsQOu9fqRvL_i9qRqg1BkFmQ@mail.gmail.com>
On Thu, Dec 03, 2015@06:35:55PM -0500, Angelo Brito wrote:
> Hello Gentlemen,
>
> We had some problems with a controller and some commands were missing
> (timeouts and cancelling I/O).
>
> I noticed that some interruptions were handled by different CPUs, like
> in this example:
I doubt the interrupt affinity you're seeing could have anything
to do with timeouts or missing commands.
There is a small window of time when a disk is initially brought online,
but before the affinity hints are provided. Because of that, even if
you properly affinitize all irqs to use the driver's hint, you'll likely
see a few irqs on non-optimal CPU.
next prev parent reply other threads:[~2015-12-03 23:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-03 23:35 IRQ and CPU Affinity on new Kernels Angelo Brito
2015-12-03 23:50 ` Keith Busch [this message]
2015-12-04 15:19 ` Angelo Brito
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