From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Nick Piggin <npiggin@suse.de>, Jens Axboe <jens.axboe@oracle.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org,
Ravikiran G Thirumalai <kiran@scalex86.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [rfc][patch] store-free path walking
Date: Wed, 7 Oct 2009 13:51:07 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.01.0910071349190.3432@localhost.localdomain> (raw)
In-Reply-To: <87eipfymcv.fsf@basil.nowhere.org>
On Wed, 7 Oct 2009, Andi Kleen wrote:
>
> With some strategic prefetches it might be cheap enough to use
> two cache lines. Just fetch it with the other.
I _seriously_ doubt that.
This is one of the biggest (and hottest) hash tables in the whole kernel.
No amount of prefetching will help the fact that you effectively double
your cache footprint / working set if you have to fetch two cachelines in
the hot case lookup rather than one.
Linus
next prev parent reply other threads:[~2009-10-07 20:53 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 6:49 Latest vfs scalability patch Nick Piggin
2009-10-06 10:14 ` Jens Axboe
2009-10-06 10:26 ` Jens Axboe
2009-10-06 11:10 ` Peter Zijlstra
2009-10-06 12:51 ` Jens Axboe
2009-10-06 12:26 ` Nick Piggin
2009-10-06 12:49 ` Jens Axboe
2009-10-07 8:58 ` [rfc][patch] store-free path walking Nick Piggin
2009-10-07 9:56 ` Jens Axboe
2009-10-07 10:10 ` Nick Piggin
2009-10-12 3:58 ` Nick Piggin
2009-10-12 5:59 ` Nick Piggin
2009-10-12 8:20 ` Jens Axboe
2009-10-12 11:00 ` Jens Axboe
2009-10-13 1:26 ` Christoph Hellwig
2009-10-13 1:52 ` Nick Piggin
2009-10-07 14:56 ` Linus Torvalds
2009-10-07 16:27 ` Linus Torvalds
2009-10-07 16:46 ` Nick Piggin
2009-10-07 19:25 ` Linus Torvalds
2009-10-07 20:34 ` Andi Kleen
2009-10-07 20:51 ` Linus Torvalds [this message]
2009-10-07 21:06 ` Andi Kleen
2009-10-07 21:20 ` Linus Torvalds
2009-10-07 21:57 ` Linus Torvalds
2009-10-07 22:22 ` Andi Kleen
2009-10-08 7:39 ` Nick Piggin
2009-10-09 17:53 ` Andi Kleen
2009-10-08 13:12 ` Denys Vlasenko
2009-10-09 7:47 ` Nick Piggin
2009-10-09 17:49 ` Andi Kleen
2009-10-07 16:29 ` Nick Piggin
2009-10-08 12:36 ` Nick Piggin
2009-10-08 12:57 ` Jens Axboe
2009-10-08 13:22 ` Nick Piggin
2009-10-08 13:30 ` Jens Axboe
2009-10-08 18:00 ` Peter Zijlstra
2009-10-09 4:04 ` Nick Piggin
2009-10-09 8:54 ` Jens Axboe
2009-10-09 9:51 ` Jens Axboe
2009-10-09 10:02 ` Nick Piggin
2009-10-09 10:08 ` Jens Axboe
2009-10-09 10:07 ` Nick Piggin
2009-10-09 3:50 ` Nick Piggin
2009-10-09 6:15 ` David Miller
2009-10-09 10:40 ` Nick Piggin
2009-10-09 11:09 ` Jens Axboe
2009-10-09 10:44 ` Nick Piggin
2009-10-09 10:48 ` Jens Axboe
2009-10-09 23:16 ` Paul E. McKenney
2009-10-15 10:08 ` Latest vfs scalability patch Anton Blanchard
2009-10-15 10:39 ` Nick Piggin
2009-10-15 10:46 ` Anton Blanchard
2009-10-15 10:53 ` Nick Piggin
2009-10-15 11:23 ` Anton Blanchard
2009-10-15 11:41 ` Nick Piggin
2009-10-15 11:48 ` Nick Piggin
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