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From: "Lee Revell" <rlrevell@joe-job.com>
To: "Matthew Fredrickson" <creslin@digium.com>
Cc: "Robert Hancock" <hancockr@shaw.ca>,
	"Tejun Heo" <htejun@gmail.com>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: High CPU usage with sata_nv
Date: Wed, 21 Feb 2007 13:04:12 -0500	[thread overview]
Message-ID: <75b66ecd0702211004x49c4613cqe26d4871ec1453e8@mail.gmail.com> (raw)
In-Reply-To: <0c69abe94bbc69f652831a64ad77d0cb@digium.com>

On 2/21/07, Matthew Fredrickson <creslin@digium.com> wrote:
> It's a 2.6.18 kernel.  What we're seeing (by means of the interrupt pin
> on another card) is extremely large interrupt latency (measured from
> the time the interrupt pin goes low to the first couple lines of code
> in the IRQ handler to clear it) occasionally, in the order of 500-700
> microseconds.  I figured it was some other driver on the system
> disabling irqs for a long period of time, but it's difficult to trace
> what might be doing that.

Apply the -rt kernel patch and enable the latency tracer, it will tell
you what code path is responsible.

Lee

  reply	other threads:[~2007-02-21 18:04 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.1OWRIIUBXsZOXflsGLA+7d4YCc0@ifi.uio.no>
     [not found] ` <fa.A0XBTh7eCfsh11d3AhMO71/4xQU@ifi.uio.no>
     [not found]   ` <fa.fCm35VohC2wt9vlkg94Ru7me4ic@ifi.uio.no>
     [not found]     ` <fa.qDqCne4pXntL0PolSS2j8t4py3g@ifi.uio.no>
     [not found]       ` <fa.8TboLRab6f7zzIWFr/JPM6q04Zo@ifi.uio.no>
     [not found]         ` <fa.PMqnzxUBiShkWV4h9SiztNIwYc0@ifi.uio.no>
2007-02-21  3:43           ` High CPU usage with sata_nv Robert Hancock
2007-02-21 15:28             ` Matthew Fredrickson
2007-02-21 18:04               ` Lee Revell [this message]
2007-02-22  2:34               ` Robert Hancock
     [not found] <20070115164541.M22367@elsat.net.pl>
2007-01-15 16:54 ` ris
2007-01-15 18:26   ` Frederik Deweerdt
2007-01-15 22:28     ` ris
2007-01-22  3:40       ` Tejun Heo
2007-02-11 22:31         ` ris
2007-02-12  6:49           ` Tejun Heo
2007-02-12 14:11             ` ris
2007-02-12 16:18               ` Tejun Heo
2007-02-12 20:02             ` Matthew Fredrickson
2007-02-12 20:09               ` Tejun Heo

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