From: Tejun Heo <tj@kernel.org>
To: Alexander Gordeev <agordeev@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: [PATCH RESEND v3 5/6] AHCI: Optimize single IRQ interrupt processing
Date: Sat, 4 Oct 2014 22:23:11 -0400 [thread overview]
Message-ID: <20141005022311.GD8549@htj.dyndns.org> (raw)
In-Reply-To: <20141001153114.GE8971@agordeev.usersys.redhat.com>
Hey, Alexander.
On Wed, Oct 01, 2014 at 04:31:15PM +0100, Alexander Gordeev wrote:
> As of your concern wrt threaded handler invocation overhead - I am
> not quite sure here, but if SCHED_FIFO policy (the handler runs with)
> makes the difference? Anyway, as said above the overall IO does not
> suffer.
Hmmm.... so, AFAICS, there's no real pros or cons of going either way,
right? The only thing which could be different is possibly slightly
lower latency in servicing other IRQs or RT tasks on the same CPU but
given that the ahci IRQ handler already doesn't do anything which
takes time, I'm doubtful whether that'd be anything measureable.
I just don't get why ahci bothers with threaded irq, MMSI or not.
Thanks.
--
tejun
next prev parent reply other threads:[~2014-10-05 2:23 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-21 13:19 [PATCH RESEND v3 0/6] AHCI: Optimize interrupt processing Alexander Gordeev
2014-09-21 13:19 ` [PATCH RESEND v3 1/6] AHCI: Cleanup checking of multiple MSIs/SLM modes Alexander Gordeev
2014-09-23 20:18 ` Tejun Heo
2014-09-21 13:19 ` [PATCH RESEND v3 2/6] AHCI: Move host activation code into ahci_host_activate() Alexander Gordeev
2014-09-23 20:22 ` Tejun Heo
2014-09-23 20:55 ` Tejun Heo
2014-09-21 13:19 ` [PATCH RESEND v3 3/6] AHCI: Make few function names more descriptive Alexander Gordeev
2014-09-23 20:22 ` Tejun Heo
2014-09-21 13:19 ` [PATCH RESEND v3 4/6] AHCI: Get rid of redundant arg to ahci_handle_port_interrupt() Alexander Gordeev
2014-09-21 13:19 ` [PATCH RESEND v3 5/6] AHCI: Optimize single IRQ interrupt processing Alexander Gordeev
2014-09-23 20:57 ` Tejun Heo
2014-09-24 10:42 ` Alexander Gordeev
2014-09-24 13:04 ` Tejun Heo
2014-09-24 13:27 ` Chuck Ebbert
2014-09-24 13:36 ` Tejun Heo
2014-09-24 14:08 ` Alexander Gordeev
2014-09-24 14:39 ` Tejun Heo
2014-09-24 14:59 ` Alexander Gordeev
2014-09-25 3:27 ` Tejun Heo
2014-10-01 15:31 ` Alexander Gordeev
2014-10-01 15:39 ` Alexander Gordeev
2014-10-05 2:23 ` Tejun Heo [this message]
2014-10-05 16:16 ` Tejun Heo
2014-10-06 7:27 ` Alexander Gordeev
2014-10-06 12:58 ` Tejun Heo
2014-10-06 13:24 ` Alexander Gordeev
2014-10-06 14:54 ` Tejun Heo
2014-09-25 3:00 ` Elliott, Robert (Server Storage)
2014-09-21 13:19 ` [PATCH RESEND v3 6/6] AHCI: Do not read HOST_IRQ_STAT reg in multi-MSI mode Alexander Gordeev
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