From: Christoph Lameter <cl@linux.com>
To: Dave Hansen <dave@sr71.net>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH] mm: percpu pages: up batch size to fix arithmetic?? errror
Date: Thu, 12 Sep 2013 14:16:58 +0000 [thread overview]
Message-ID: <00000141128835e1-8664ca3a-c439-4d9d-89cb-308664595db4-000000@email.amazonses.com> (raw)
In-Reply-To: <523108B7.7050101@sr71.net>
On Wed, 11 Sep 2013, Dave Hansen wrote:
> 3. We want ->high to approximate the size of the cache which is
> private to a given cpu. But, that's complicated by the L3 caches
> and hyperthreading today.
well lets keep it well below that. There are other caches (slab related
f.e.) that are also in constant use.
> I'll take one of my big systems and run it with some various ->high
> settings and see if it makes any difference.
Do you actually see contention issues on the locks? I think we have a
tendency to batch too much in too many caches.
next prev parent reply other threads:[~2013-09-12 14:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-11 22:08 [RFC][PATCH] mm: percpu pages: up batch size to fix arithmetic?? errror Dave Hansen
2013-09-11 23:08 ` Cody P Schafer
2013-09-11 23:21 ` Cody P Schafer
2013-09-12 0:20 ` Dave Hansen
2013-09-12 14:16 ` Christoph Lameter [this message]
2013-09-12 15:21 ` Dave Hansen
2013-09-11 23:58 ` Dave Hansen
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