linux-kernel - Re: File copy is very slow on linux-3.4.2 (or linux-3.3x) on a specific hardware: AMD FX-8150 + 990FX (solved?)

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Message-ID: <4FDA5048.5000107@redhat.com>
Date:	Thu, 14 Jun 2012 16:57:44 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Wallak <wallak@...e.fr>
CC:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	jweiner@...hat.com
Subject: Re: File copy is very slow on linux-3.4.2 (or linux-3.3x) on a specific
 hardware: AMD FX-8150 + 990FX (solved?)

On 06/13/2012 04:37 PM, Wallak wrote:

> HighTotal: 8052692 kB HighTotal: 8052692 kB
> HighFree: 7978664 kB | HighFree: 6227412 kB
> LowTotal: 229508 kB LowTotal: 229508 kB
> LowFree: 195804 kB | LowFree: 148948 kB

Did the BIOS remap essentially all of the low memory
to end up above the 1GB boundary?

This does not look like a system that should be run
with a 32 bit kernel, since it only has 200MB of lowmem,
giving you a 40:1 highmem:lowmem ratio, which is really
too much to run well.
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