From: Tejun Heo <tj@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Arjan van de Ven <arjan@infradead.org>,
mingo@elte.hu, bphilips@suse.de, yinghai@kernel.org,
akpm@linux-foundation.org, torvalds@linux-foundation.org,
linux-kernel@vger.kernel.org, jeff@garzik.org,
linux-ide@vger.kernel.org, stern@rowland.harvard.edu,
gregkh@suse.de, khali@linux-fr.org
Subject: Re: [PATCH 09/12] irq: implement IRQ expecting
Date: Thu, 17 Jun 2010 13:23:27 +0200 [thread overview]
Message-ID: <4C1A05AF.5010405@kernel.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1006171310560.4290@localhost.localdomain>
On 06/17/2010 01:12 PM, Thomas Gleixner wrote:
>> Hmmm.... oh, I see. Wouldn't it be much better to use moving avg of
>> IRQ durations instead of letting the driver specify it? Drivers are
>> most likely to just hard code it and It's never gonna be accurate.
>
> Right, but that's probably more accurate than the core code heuristics
> ever will be.
Eh, not really. For ATA at least, there will be three different
classes of devices. SSDs, hard drives and optical devices and if we
get running avg w/ fairly large stability part, the numbers wouldn't
be too far off and there's no reliable way for the driver to tell
which type of device is on the other side of the cable. So, I think
running avg would work much better.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-06-17 11:24 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-13 15:31 [PATCHSET] irq: better lost/spurious irq handling Tejun Heo
2010-06-13 15:31 ` [PATCH 01/12] irq: cleanup irqfixup Tejun Heo
2010-06-13 15:31 ` [PATCH 02/12] irq: make spurious poll timer per desc Tejun Heo
2010-06-15 5:10 ` Konrad Rzeszutek Wilk
2010-06-15 16:34 ` Tejun Heo
2010-06-13 15:31 ` [PATCH 03/12] irq: use desc->poll_timer for irqpoll Tejun Heo
2010-06-13 15:31 ` [PATCH 04/12] irq: kill IRQF_IRQPOLL Tejun Heo
2010-06-13 15:31 ` [PATCH 05/12] irq: misc preparations for further changes Tejun Heo
2010-06-13 15:31 ` [PATCH 06/12] irq: implement irq_schedule_poll() Tejun Heo
2010-06-13 15:31 ` [PATCH 07/12] irq: improve spurious IRQ handling Tejun Heo
2010-06-13 15:31 ` [PATCH 08/12] irq: implement IRQ watching Tejun Heo
2010-06-13 15:31 ` [PATCH 09/12] irq: implement IRQ expecting Tejun Heo
2010-06-14 9:21 ` Jiri Slaby
2010-06-14 9:43 ` Tejun Heo
2010-06-14 9:46 ` Tejun Heo
2010-06-17 3:48 ` Arjan van de Ven
2010-06-17 8:18 ` Tejun Heo
2010-06-17 11:12 ` Thomas Gleixner
2010-06-17 11:23 ` Tejun Heo [this message]
2010-06-17 11:43 ` Alan Cox
2010-06-17 15:54 ` Tejun Heo
2010-06-17 16:02 ` Arjan van de Ven
2010-06-17 16:47 ` Tejun Heo
2010-06-18 6:26 ` Arjan van de Ven
2010-06-18 9:23 ` Tejun Heo
2010-06-18 9:45 ` Thomas Gleixner
2010-06-19 8:35 ` Andi Kleen
2010-06-19 8:42 ` Tejun Heo
2010-06-19 9:00 ` Andi Kleen
2010-06-19 9:03 ` Tejun Heo
2010-06-19 14:54 ` Arjan van de Ven
2010-06-19 19:49 ` Andi Kleen
2010-06-19 20:07 ` Arjan van de Ven
2010-06-13 15:31 ` [PATCH 10/12] irq: add comment about overall design of lost/spurious IRQ handling Tejun Heo
2010-06-13 15:31 ` [PATCH 11/12] libata: use IRQ expecting Tejun Heo
2010-06-13 15:31 ` [PATCH 12/12] usb: use IRQ watching Tejun Heo
2010-06-14 21:41 ` Greg KH
2010-06-14 21:52 ` Tejun Heo
2010-06-14 22:11 ` Greg KH
2010-06-14 22:19 ` Tejun Heo
2010-06-15 10:30 ` Kay Sievers
2010-06-15 11:05 ` Jean Delvare
2010-06-15 13:30 ` Kay Sievers
2010-06-15 11:20 ` Tejun Heo
2010-06-15 13:36 ` Kay Sievers
2010-06-15 17:36 ` Tejun Heo
2010-06-15 17:47 ` Greg KH
2010-06-15 17:52 ` Tejun Heo
2010-06-21 13:51 ` Tejun Heo
2010-06-21 20:27 ` Greg KH
2010-06-22 7:32 ` Tejun Heo
[not found] ` <1276443098-20653-12-git-send-email-tj@kernel.org>
2010-06-21 13:52 ` [PATCH 11/12] libata: use IRQ expecting Tejun Heo
2010-06-25 0:22 ` Jeff Garzik
2010-06-25 7:44 ` Tejun Heo
2010-06-25 9:48 ` Jeff Garzik
2010-06-25 9:51 ` Tejun Heo
2010-06-25 13:02 ` [PATCH 1/2 #upstream] sata_fsl,mv,nv: prepare for NCQ command completion update Tejun Heo
2010-06-25 13:03 ` [PATCH 2/2 #upstream] libata: always use ata_qc_complete_multiple() for NCQ command completions Tejun Heo
2010-08-17 22:03 ` Jeff Garzik
2010-08-01 23:47 ` [PATCH 1/2 #upstream] sata_fsl,mv,nv: prepare for NCQ command completion update Jeff Garzik
2010-08-02 7:18 ` Tejun Heo
2010-08-04 4:22 ` Jeff Garzik
2010-06-26 3:45 ` [PATCH 11/12] libata: use IRQ expecting Jeff Garzik
2010-06-26 3:52 ` Jeff Garzik
2010-06-26 8:31 ` Tejun Heo
2010-06-26 9:16 ` Jeff Garzik
2010-06-26 9:44 ` Tejun Heo
2010-07-02 14:41 ` Tejun Heo
2010-07-02 14:53 ` Tejun Heo
2010-07-10 10:06 ` Tejun Heo
2010-07-14 7:58 ` Jeff Garzik
2010-07-14 9:26 ` Tejun Heo
2010-07-27 17:37 ` Jeff Garzik
2010-07-02 14:59 ` [GIT PULL] irq: better lost/spurious irq handling Tejun Heo
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