AW: [bigmem-patch] 4GB with Linux on IA32

Wichert, Gerhard (Gerhard.Wichert@pdb.siemens.de)
Tue, 17 Aug 1999 16:58:32 +0200

> -----Ursprüngliche Nachricht-----
> Von: Matthew Wilcox [mailto:Matthew.Wilcox@genedata.com]
> Gesendet am: Dienstag, 17. August 1999 16:32
> An: Wichert, Gerhard
> Cc: linux-kernel@vger.rutgers.edu; linux-mm@kvack.org
> Betreff: Re: [bigmem-patch] 4GB with Linux on IA32
>
> On Mon, Aug 16, 1999 at 06:29:30PM +0200, Andrea Arcangeli wrote:
> > Performance degradation:
> >
> > Close to zero.
Here are some numbers I got when compiling the kernel on a 4-way 400MHz
Dechutes machine with 4GB memory.

Linux-2.3.13
time make -j 4 bzImage >/dev/null 2>&1

run 1
real 1m36.442s
user 4m49.060s
sys 0m22.300s

run 2
real 1m36.788s
user 4m48.920s
sys 0m22.290s

run 3
real 1m37.016s
user 4m48.670s
sys 0m22.910s

run 4
real 1m36.897s
user 4m48.800s
sys 0m22.390s

run 5
real 1m37.584s
user 4m48.680s
sys 0m22.180s

Linux-2.3.13 with bigmem support
time make -j 4 bzImage >/dev/null 2>&1

run 1
real 1m36.647s
user 4m50.340s
sys 0m21.870s

run 2
real 1m36.890s
user 4m49.780s
sys 0m22.410s

run 3
real 1m36.825s
user 4m49.360s
sys 0m22.930s

run 4
real 1m36.793s
user 4m50.180s
sys 0m22.270s

run 5
real 1m36.821s
user 4m50.500s
sys 0m22.030s

>
> Have you got some lmbench results to back this up?
>
What do you expect from lmbench. As far as I know it measures cache, memory
and tlb miss latencies. For this bench there is no difference if the mapping
goes to low or big memory.

Gerhard.

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