Re: HIGHMEM4G config for 1GB RAM on desktop?

From: Jens Axboe (axboe_at_suse.de)
Date: 08/03/04

  • Next message: John Cherry: "IA32 (2.6.8-rc2 - 2004-08-02.22.30) - 5 New warnings (gcc 3.2.2)" 
    Date:	Tue, 3 Aug 2004 15:30:35 +0200
To: "Barry K. Nathan" <barryn@pobox.com>

    On Mon, Aug 02 2004, Barry K. Nathan wrote:
    > On Mon, Aug 02, 2004 at 04:02:34PM -0500, Steve Snyder wrote:
    > > There seems to be a controversy about the use of the CONFIG_HIGHMEM4G
    > > kernel configuration. After reading many posts on the subject, I still
    > > don't know which setting is best for me.
    >
    > On my own desktop system with 1GB RAM, any highmem slowdown seems to be
    > outweighed by the fact that more disk data stays cached in RAM (so I hit
    > the disk much less often).

    There's also the option of moving the mapping only slightly, so that all
    of the 1G fits in low memory. That's the best option for 1G desktop
    machines, imho. Changing PAGE_OFFSET from 0xc0000000 to 0xb0000000 would
    probably be enough.

    Then you can have your cake and eat it too. 

    -- 
Jens Axboe
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