Messages in this thread | | | From | "Wichert, Gerhard" <> | Subject | AW: [bigmem-patch] 4GB with Linux on IA32 | Date | Tue, 17 Aug 1999 16:58:32 +0200 |
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> -----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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