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: <4FDCDF59.9020208@free.fr>
Date:	Sat, 16 Jun 2012 21:32:41 +0200
From:	Wallak <wallak@...e.fr>
To:	Rik van Riel <riel@...hat.com>
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?)

Rik van Riel wrote:
> 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?

     May be not, but there was also a vmalloc= option on the linux 
command line; Theses options must be used with caution, and takes some 
low memory.
>
> 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.
>
     You are right; I will try also in 64-bits mode.

                                                                         
                                         Wallak.

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