From: Shaohua Li <shaohua.li@intel.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>,
lkml <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>,
"lee.schermerhorn@hp.com" <lee.schermerhorn@hp.com>,
David Rientjes <rientjes@google.com>
Subject: Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance
Date: Thu, 15 Dec 2011 09:27:51 +0800 [thread overview]
Message-ID: <1323912471.22361.431.camel@sli10-conroe> (raw)
In-Reply-To: <20111214175302.GA2600@alboin.jf.intel.com>
On Thu, 2011-12-15 at 01:53 +0800, Andi Kleen wrote:
> > That's what I want to avoid letting each apps to explicitly do it, it's
> > a lot of burden.
>
> Usually apps that set NUMA policy can change it. Most don't anyways.
> If it's just a script with numactl it's easily changed.
Hmm, why should apps set different granularity? the granularity change
is to speed up I/O, which should have the same value for all apps.
> > That's true only workload with heavy I/O wants this. but I don't expect
> > it will harm other workloads.
>
> How do you know?
I can't imagine how it could harm. Some arches can use big pages, big
granularity should already been tested for years.
Thanks,
Shaohua
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next prev parent reply other threads:[~2011-12-15 1:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 1:58 [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance Shaohua Li
2011-12-13 19:06 ` Andi Kleen
2011-12-13 20:12 ` Christoph Lameter
2011-12-13 20:38 ` Andi Kleen
2011-12-14 2:33 ` Shaohua Li
2011-12-14 17:53 ` Andi Kleen
2011-12-15 1:27 ` Shaohua Li [this message]
2012-01-09 7:31 ` Shaohua Li
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