From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Jones <davej@redhat.com>,
tim.c.chen@linux.intel.com, linux-kernel@vger.kernel.org
Subject: Re: Change in default vm_dirty_ratio
Date: Wed, 20 Jun 2007 10:17:40 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.0.98.0706201015370.3593@woody.linux-foundation.org> (raw)
In-Reply-To: <1182328536.21117.24.camel@twins>
On Wed, 20 Jun 2007, Peter Zijlstra wrote:
>
> Building on the per BDI patches, how about integrating feedback from the
> full-ness of device queues. That is, when we are happily doing IO and we
> cannot possibly saturate the active devices (as measured by their queue
> never reaching 75%?) then we can safely increase the total dirty limit.
The really annoying things are the one-off things. You've been happily
working for a while (never even being _close_ to saturatign any IO
queues), and then you untar a large tree.
If the kernel now let's you dirty lots of memory, you'll have a very
unpleasant experience.
And with hot-pluggable devices (which is where most of the throughput
problems tend to be!), the "one-off" thing is not a "just after reboot"
kind of situation.
So you'd have to be pretty smart about it.
Linus
next prev parent reply other threads:[~2007-06-20 17:18 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-18 21:14 Tim Chen
2007-06-18 23:47 ` Andrew Morton
2007-06-19 0:06 ` Linus Torvalds
2007-06-19 0:09 ` Arjan van de Ven
2007-06-19 18:41 ` John Stoffel
2007-06-19 19:04 ` Linus Torvalds
2007-06-19 19:06 ` Linus Torvalds
2007-06-19 22:33 ` David Miller
2007-06-19 19:57 ` Andi Kleen
2007-06-20 4:24 ` Dave Jones
2007-06-20 4:44 ` Andrew Morton
2007-06-20 8:35 ` Peter Zijlstra
2007-06-20 8:58 ` Andrew Morton
2007-06-20 9:14 ` Jens Axboe
2007-06-20 9:19 ` Peter Zijlstra
2007-06-20 9:20 ` Jens Axboe
2007-06-20 9:43 ` Peter Zijlstra
2007-06-21 22:53 ` Matt Mackall
2007-06-21 23:08 ` Linus Torvalds
2007-06-23 18:23 ` Peter Zijlstra
2007-06-24 16:40 ` Linus Torvalds
2007-06-25 0:15 ` Peter Zijlstra
2007-06-20 9:19 ` Peter Zijlstra
2007-06-21 16:54 ` Mark Lord
2007-06-21 16:55 ` Peter Zijlstra
2007-06-20 17:17 ` Linus Torvalds [this message]
2007-06-20 18:12 ` Arjan van de Ven
2007-06-20 18:28 ` Linus Torvalds
2007-06-21 12:37 ` Nadia Derbey
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