From: Mikael Pettersson <mikpe@csd.uu.se>
To: Matt Hahnfeld <matth@everysoft.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SLOW machine when HIGHMEM enabled (1gb memory, kernel 2.4.22)
Date: Sun, 21 Sep 2003 22:35:00 +0200 [thread overview]
Message-ID: <16238.2932.99763.591328@gargle.gargle.HOWL> (raw)
In-Reply-To: <Pine.LNX.4.44.0309211558570.12232-100000@sotec>
Matt Hahnfeld writes:
> I have an ASUS P4P800-VM motherboard with 2 sticks of 512mb PC3200 and
> a single 2.4 ghz P4 processor. The kernel is vanilla 2.4.22 configured
> for SMP (hyperthreading).
>
> When I use a kernel with high memory support off, I get good
> performance (despite not being able to use some of my memory). When I
> enable CONFIG_HIGHMEM4G the remaining memory is detected, but the
> machine takes a big performance hit and starts running very slow --
> ie. kernel compilation looks like it would take 5 days instead of 5
> minutes. /proc/meminfo doesn't look particularly strange and no
> strange log messages show up -- everything just runs slow...
>
> CONFIG_HIGHMEM64G produces the same results...
>
> Any suggestions?
Sounds like maybe the high RAM isn't cacheable.
What does /proc/mtrr and dmesg look like?
Have you verified that you're running the latest BIOS?
next prev parent reply other threads:[~2003-09-21 20:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-21 20:10 Matt Hahnfeld
2003-09-21 20:35 ` Mikael Pettersson [this message]
2003-09-21 21:07 ` Matt Hahnfeld
2003-09-21 21:42 ` Mikael Pettersson
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