From: Marvin Justice <mjustice@austin.rr.com>
To: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: highmem question
Date: Fri, 7 Dec 2001 19:30:01 -0600 [thread overview]
Message-ID: <01120719300102.00764@bozo> (raw)
In-Reply-To: <Pine.LNX.4.30.0112071404280.29154-100000@mustard.heime.net> <9url8t$nmo$1@cesium.transmeta.com>
In-Reply-To: <9url8t$nmo$1@cesium.transmeta.com>
>
> > I heard that himem slows down systems.
>
> It does, because it's a hack to extend 32-bit machines beyond their
> architectural lifetime.
>
While it certainly makes sense to expect a performance hit for mem above 4GB
on 32 bit systems I don't see why there should be any a priori reason to
either move to 64 bit or take a performance hit for if you need, say, 2GB of
RAM. The problem is that 2.4 Linux considers HIGHMEM to be anything above
896MB.
>From what I've read it looks like there will be changes in 2.5 to fix all
this.
Marvin Justice
next prev parent reply other threads:[~2001-12-08 1:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-07 13:06 highmem question Roy Sigurd Karlsbakk
2001-12-08 0:01 ` H. Peter Anvin
2001-12-08 1:30 ` Marvin Justice [this message]
2001-12-08 1:28 ` H. Peter Anvin
2001-12-08 1:53 ` Marvin Justice
2001-12-08 1:52 ` H. Peter Anvin
2001-12-08 1:54 ` Jens Axboe
2001-12-08 1:58 ` H. Peter Anvin
2001-12-08 2:02 ` Jens Axboe
2001-12-08 2:10 ` Marvin Justice
2001-12-08 2:08 ` H. Peter Anvin
2001-12-08 2:10 ` Jens Axboe
2001-12-08 3:43 ` war
2001-12-08 3:46 ` H. Peter Anvin
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