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Date: Fri, 19 Oct 2001 23:59:51 +0200
From: Ralf Baechle <ralf@uni-koblenz.de>
To: "MEHTA,HIREN (A-SanJose,ex1)" <hiren_mehta@agilent.com>
Cc: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: pci_alloc_consistent question
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In-Reply-To: <01A7DAF31F93D511AEE300D0B706ED9208E4A5@axcs13.cos.agilent.com>; from hiren_mehta@agilent.com on Fri, Oct 19, 2001 at 03:24:14PM -0600
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On Fri, Oct 19, 2001 at 03:24:14PM -0600, MEHTA,HIREN (A-SanJose,ex1) wrote:

> so, what is the conservative number ? 1MB ?

Even far below that.  Most systems will allocate that memory using
get_free_pages and by allocating large pages such as 1mb you'll produce
high memory pressure.  Try to get away with PAGE_SIZE * 2 if you can.
Large allocation are only ok if they're rare.

  Ralf
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