From: Andrew Morton <akpm@linux-foundation.org>
To: Mike Travis <travis@sgi.com>
Cc: mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
msalter@redhat.com, dyoung@redhat.com, riel@redhat.com,
peterz@infradead.org, mgorman@suse.de,
linux-kernel@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/2] x86: Speed up ioremap operations
Date: Wed, 27 Aug 2014 16:06:10 -0700 [thread overview]
Message-ID: <20140827160610.4ef142d28fd7f276efd38a51@linux-foundation.org> (raw)
In-Reply-To: <20140827225927.364537333@asylum.americas.sgi.com>
On Wed, 27 Aug 2014 17:59:27 -0500 Mike Travis <travis@sgi.com> wrote:
>
> We have a large university system in the UK that is experiencing
> very long delays modprobing the driver for a specific I/O device.
> The delay is from 8-10 minutes per device and there are 31 devices
> in the system. This 4 to 5 hour delay in starting up those I/O
> devices is very much a burden on the customer.
That's nuts.
> There are two causes for requiring a restart/reload of the drivers.
> First is periodic preventive maintenance (PM) and the second is if
> any of the devices experience a fatal error. Both of these trigger
> this excessively long delay in bringing the system back up to full
> capability.
>
> The problem was tracked down to a very slow IOREMAP operation and
> the excessively long ioresource lookup to insure that the user is
> not attempting to ioremap RAM. These patches provide a speed up
> to that function.
With what result?
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next prev parent reply other threads:[~2014-08-27 23:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-27 22:59 [PATCH 0/2] x86: Speed up ioremap operations Mike Travis
2014-08-27 22:59 ` [PATCH 1/2] x86: Optimize resource lookups for ioremap Mike Travis
2014-08-27 23:05 ` Andrew Morton
2014-08-27 23:09 ` Mike Travis
2014-08-27 23:18 ` Andrew Morton
2014-08-27 23:25 ` Mike Travis
2014-08-27 23:37 ` Andrew Morton
2014-08-27 23:54 ` Mike Travis
2014-08-28 0:21 ` Andrew Morton
2014-08-27 22:59 ` [PATCH 2/2] x86: Use optimized ioresource lookup in ioremap function Mike Travis
2014-08-27 23:06 ` Andrew Morton [this message]
2014-08-27 23:15 ` [PATCH 0/2] x86: Speed up ioremap operations Mike Travis
2014-08-27 23:20 ` Andrew Morton
2014-08-27 23:30 ` Mike Travis
2014-08-28 6:48 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2014-08-29 19:16 Mike Travis
2014-08-29 19:53 Mike Travis
2014-08-29 20:16 ` Andrew Morton
2014-08-29 20:44 ` Mike Travis
2014-08-29 20:52 ` Andrew Morton
2014-08-29 22:31 ` Greg KH
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