From: Pavel Machek <pavel@ucw.cz>
To: Matthew Dobson <colpatch@us.ibm.com>
Cc: Chris Wright <chrisw@osdl.org>,
linux-kernel@vger.kernel.org,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [RFC][PATCH 0/8] Critical Page Pool
Date: Mon, 21 Nov 2005 14:29:10 +0100 [thread overview]
Message-ID: <20051121132910.GA1971@elf.ucw.cz> (raw)
In-Reply-To: <43815F64.4070502@us.ibm.com>
Hi!
> > * Matthew Dobson (colpatch@us.ibm.com) wrote:
> >
> >>/proc/sys/vm/critical_pages: write the number of pages you want to reserve
> >>for the critical pool into this file
> >
> >
> > How do you size this pool?
>
> Trial and error. If you want networking to survive with no memory other
> than the critical pool for 2 minutes, for example, you pick a random value,
> block all other allocations (I have a test patch to do this), and send a
> boatload of packets at the box. If it OOMs, you need a bigger pool.
> Lather, rinse, repeat.
...and then you find out that your test was not "bad enough" or that
it needs more memory on different machines. It may be good enough hack
for your usage, but I do not think it belongs in mainline.
Pavel
--
Thanks, Sharp!
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next prev parent reply other threads:[~2005-11-21 13:29 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-18 19:32 Matthew Dobson
2005-11-18 19:36 ` [RFC][PATCH 1/8] Create " Matthew Dobson
2005-11-19 0:08 ` Paul Jackson
2005-11-21 5:50 ` Matthew Dobson
2005-11-21 5:54 ` Paul Jackson
2005-11-18 19:36 ` [RFC][PATCH 2/8] Create emergency trigger Matthew Dobson
2005-11-19 0:21 ` Paul Jackson
2005-11-21 5:51 ` Matthew Dobson
2005-11-18 19:40 ` [RFC][PATCH 3/8] Slab cleanup Matthew Dobson
2005-11-18 19:41 ` [RFC][PATCH 4/8] Fix a bug in scsi_get_command Matthew Dobson
2005-11-18 19:43 ` [RFC][PATCH 5/8] get_object/return_object Matthew Dobson
2005-11-18 19:44 ` [RFC][PATCH 6/8] slab_destruct Matthew Dobson
2005-11-18 19:44 ` [RFC][PATCH 0/8] Critical Page Pool Avi Kivity
2005-11-18 19:51 ` Matthew Dobson
2005-11-18 20:42 ` Avi Kivity
2005-11-19 0:10 ` Paul Jackson
2005-11-21 5:36 ` Matthew Dobson
2005-11-18 19:45 ` [RFC][PATCH 7/8] __cache_grow() Matthew Dobson
2005-11-18 19:47 ` [RFC][PATCH 8/8] Add support critical pool support to the slab allocator Matthew Dobson
2005-11-18 19:56 ` [RFC][PATCH 0/8] Critical Page Pool Chris Wright
2005-11-21 5:47 ` Matthew Dobson
2005-11-21 13:29 ` Pavel Machek [this message]
2005-12-06 22:54 ` Matthew Dobson
2005-12-10 8:39 ` Pavel Machek
2005-11-20 7:45 ` Keith Owens
2005-11-21 5:53 ` Matthew Dobson
2005-11-20 23:04 ` Pavel Machek
2005-11-21 5:58 ` Matthew Dobson
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