From: "H. Peter Anvin" <hpa@zytor.com>
To: war <war@starband.net>
Cc: Jens Axboe <axboe@suse.de>,
Marvin Justice <mjustice@austin.rr.com>,
linux-kernel@vger.kernel.org
Subject: Re: highmem question
Date: Fri, 07 Dec 2001 19:46:51 -0800 [thread overview]
Message-ID: <3C118D2B.9050807@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.30.0112071404280.29154-100000@mustard.heime.net> <01120719534703.00764@bozo> <20011208015446.GC32569@suse.de> <01120720102404.00764@bozo> <20011208021040.GE32569@suse.de> <3C118C6B.33EA558F@starband.net>
war wrote:
> I have 1GB of ram + HIGHMEM support on.
>
> How much of a performance impact are we talking about?
>
> 896MB of ram would be ok if HIGHMEM impacted the machine severely.
>
> Has anyone done any benchmarks with HIGHMEM vs NO HIGHMEM?
>
1 GB is really the worst case. You don't gain too much memory this way,
and suffer the necessary slowdown.
Personally I would support dropping the kernel boundary to 0xb8000000
and use 0xb8000000-0xbfffffff for iomem; that way 1 GB wouldn't need
HIGHMEM.
-hpa
prev parent reply other threads:[~2001-12-08 3:47 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
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 [this message]
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