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From: Linus Torvalds <torvalds@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: mingo@elte.hu, jens.axboe@oracle.com,
	linux-kernel@vger.kernel.org, Alan.Brunelle@hp.com,
	arjan@linux.intel.com, dgc@sgi.com, npiggin@suse.de,
	akpm@linux-foundation.org, vegard.nossum@gmail.com,
	penberg@gmail.com
Subject: Re: [patch] block layer: kmemcheck fixes
Date: Thu, 7 Feb 2008 17:28:30 -0800 (PST)	[thread overview]
Message-ID: <alpine.LFD.1.00.0802071726120.2896@woody.linux-foundation.org> (raw)
In-Reply-To: <20080207.172246.31415231.davem@davemloft.net>



On Thu, 7 Feb 2008, David Miller wrote:
> 
> Maybe cpus these days have so much store bandwith that doing
> things like the above is OK, but I doubt it :-)

I seriously doubt the same is true for the IO requests (which are 
different anyway, and tend to happen at a much lower frequency than 
high-speed networking).

I also suspect that your timings were very hardware-dependent in the first 
place (and yes, the long-term effect is likely working against that 
"optimization"), and depend a lot on just how sparse the initialization 
can to be.

		Linus

  reply	other threads:[~2008-02-08  1:29 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-07  9:18 [PATCH 0/8] IO queuing and complete affinity Jens Axboe
2008-02-07  9:18 ` [PATCH 1/8] block: split softirq handling into blk-softirq.c Jens Axboe
2008-02-07  9:18 ` [PATCH 2/8] Add interface for queuing work on a specific CPU Jens Axboe
2008-02-07  9:45   ` Andrew Morton
2008-02-07  9:49     ` Jens Axboe
2008-02-07 17:44       ` Harvey Harrison
2008-02-11 10:51     ` Oleg Nesterov
2008-02-07  9:19 ` [PATCH 3/8] block: make kblockd_schedule_work() take the queue as parameter Jens Axboe
2008-02-07  9:19 ` [PATCH 4/8] x86: add support for remotely triggering the block softirq Jens Axboe
2008-02-07 10:07   ` Ingo Molnar
2008-02-07 10:17     ` Jens Axboe
2008-02-07 10:25       ` Ingo Molnar
2008-02-07 10:31         ` Jens Axboe
2008-02-07 10:38           ` Ingo Molnar
2008-02-07 14:18             ` Jens Axboe
2008-02-07 10:49           ` [patch] block layer: kmemcheck fixes Ingo Molnar
2008-02-07 17:42             ` Linus Torvalds
2008-02-07 17:55               ` Jens Axboe
2008-02-07 19:31               ` Ingo Molnar
2008-02-07 20:06                 ` Jens Axboe
2008-02-08  1:22               ` David Miller
2008-02-08  1:28                 ` Linus Torvalds [this message]
2008-02-08 15:09                 ` Arjan van de Ven
2008-02-08 22:44                   ` Nick Piggin
2008-02-08 22:56                     ` Arjan van de Ven
2008-02-08 23:58                       ` Nick Piggin
2008-02-08 11:38               ` Jens Axboe
2008-02-07  9:19 ` [PATCH 5/8] x86-64: add support for remotely triggering the block softirq Jens Axboe
2008-02-07  9:19 ` [PATCH 6/8] ia64: " Jens Axboe
2008-02-07  9:19 ` [PATCH 7/8] kernel: add generic softirq interface for triggering a remote softirq Jens Axboe
2008-02-07  9:19 ` [PATCH 8/8] block: add test code for testing CPU affinity Jens Axboe
2008-02-07 15:16 ` [PATCH 0/8] IO queuing and complete affinity Alan D. Brunelle
2008-02-07 18:25 ` IO queuing and complete affinity with threads (was Re: [PATCH 0/8] IO queuing and complete affinity) Jens Axboe
2008-02-07 20:40   ` Alan D. Brunelle
2008-02-08  7:38   ` Nick Piggin
2008-02-08  7:47     ` Jens Axboe
2008-02-08  7:53       ` Nick Piggin
2008-02-08  7:59         ` Jens Axboe
2008-02-08  8:12           ` Nick Piggin
2008-02-08  8:24             ` Jens Axboe
2008-02-08  8:33               ` Nick Piggin
2008-02-11  5:22           ` David Chinner
2008-02-12  8:28             ` Jeremy Higdon

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