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Re: cp file /dev/zero <-> cache [was Re: increasing page size]

To: Rik van Riel <H.H.vanRiel@phys.uu.nl>
Subject: Re: cp file /dev/zero <-> cache [was Re: increasing page size]
From: MOLNAR Ingo <mingo@valerie.inf.elte.hu>
Date: Sun, 5 Jul 1998 20:57:59 +0200 (MET DST)
cc: Andrea Arcangeli <arcangeli@mbox.queen.it>, Linux MM <linux-mm@kvack.org>, Linux Kernel <linux-kernel@vger.rutgers.edu>
In-Reply-To: <Pine.LNX.3.96.980705185219.1574D-100000@mirkwood.dummy.home>
Sender: owner-linux-mm@kvack.org


On Sun, 5 Jul 1998, Rik van Riel wrote:

> > I run hdparm -a0 /dev/hda and nothing change. Now the cache take 20Mbyte
> > of memory running cp file /dev/null while memtest 10000000 is running.
> 
> Hdparm only affects _hardware_ readahead and has nothing
> to do with software readahead.

nope, -a0 turns off software readahead. -A controls hardware readahead.

-- mingo

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References:
- Re: cp file /dev/zero <-> cache [was Re: increasing page size]
  - From: Rik van Riel <H.H.vanRiel@phys.uu.nl>

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