From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Jamie Lokier <jamie@shareable.org>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"David Brownell" <dbrownell@users.sourceforge.net>,
"Eric Miao" <eric.y.miao@gmail.com>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"John Stultz" <johnstul@us.ibm.com>,
"Rusty Russell" <rusty@rustcorp.com.au>,
LKML <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@elte.hu>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Nicolas Pitre" <nico@marvell.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] warn about shared irqs requesting IRQF_DISABLED registered with setup_irq
Date: Sun, 29 Nov 2009 15:27:57 +0000 [thread overview]
Message-ID: <20091129152757.GF11445@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20091129151840.GA30813@shareable.org>
On Sun, Nov 29, 2009 at 03:18:40PM +0000, Jamie Lokier wrote:
> Or we could do away with this silliness and just switch everything to
> threaded interrupts with RT-priorities ;-)
... thereby needlessly increasing the latency of all interrupt handling
and probably breaking some devices.
Some devices (eg, SMC91x, serial ports, PIO audio - AACI, MMCI) are
_extremely_ sensitive to interrupt latency due to lack of FIFO depth.
MMCI already sees overruns on ARM platforms if you try and clock the
cards at anything over about 500kHz. Adding any more latency means
reducing the maximum clock rate there, and therefore crippling
throughput even more than it is already.
next prev parent reply other threads:[~2009-11-29 15:29 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20091127195857.GB28193@n2100.arm.linux.org.uk>
2009-11-27 21:10 ` [PATCH] warn about shared irqs requesting IRQF_DISABLED registered with setup_irq Uwe Kleine-König
2009-11-27 22:18 ` Thomas Gleixner
2009-11-28 20:03 ` Uwe Kleine-König
2009-11-28 21:50 ` Thomas Gleixner
2009-11-28 22:13 ` David Brownell
2009-11-29 2:31 ` Jamie Lokier
2009-11-29 10:26 ` Uwe Kleine-König
2009-11-29 15:18 ` Jamie Lokier
2009-11-29 15:27 ` Russell King - ARM Linux [this message]
2009-11-30 20:39 ` Jamie Lokier
2009-11-30 9:28 ` Uwe Kleine-König
2009-11-30 9:54 ` Thomas Gleixner
2009-11-28 22:09 ` David Brownell
2009-11-30 10:47 ` [PATCH] genirq: warn about IRQF_SHARED|IRQF_DISABLED at the right place Uwe Kleine-König
2009-11-30 13:54 ` Get rid of IRQF_DISABLED - (was [PATCH] genirq: warn about IRQF_SHARED|IRQF_DISABLED) Thomas Gleixner
2009-11-30 14:03 ` Peter Zijlstra
2009-11-30 14:24 ` Thomas Gleixner
2009-11-30 14:47 ` Alan Cox
2009-11-30 15:01 ` Russell King - ARM Linux
2009-11-30 15:32 ` Alan Cox
2009-11-30 15:43 ` Russell King - ARM Linux
2009-11-30 20:15 ` Andrew Victor
2009-11-30 20:53 ` David Brownell
2009-11-30 20:38 ` David Brownell
2009-12-01 1:42 ` Andy Walls
2009-11-30 19:59 ` Benjamin Herrenschmidt
2009-11-30 21:31 ` Thomas Gleixner
2009-11-30 21:42 ` Benjamin Herrenschmidt
2009-11-30 21:54 ` Thomas Gleixner
2009-11-30 14:37 ` Russell King - ARM Linux
2009-11-30 14:39 ` Russell King - ARM Linux
2009-11-30 17:48 ` Thomas Gleixner
2009-11-30 14:51 ` Alan Cox
2009-11-30 21:59 ` Thomas Gleixner
2009-11-30 23:30 ` Alan Cox
2009-11-30 15:38 ` Nicolas Pitre
2009-11-30 17:46 ` Thomas Gleixner
2009-11-30 19:51 ` Uwe Kleine-König
2009-11-30 21:23 ` Thomas Gleixner
2009-11-30 20:21 ` [PATCH] genirq: warn about IRQF_SHARED|IRQF_DISABLED at the right place David Brownell
2009-11-30 20:27 ` Uwe Kleine-König
2010-01-12 15:42 ` [RESEND PATCH] " Uwe Kleine-König
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