From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: From: "Wichert, Gerhard" Subject: AW: [bigmem-patch] 4GB with Linux on IA32 Date: Tue, 17 Aug 1999 16:58:32 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Sender: owner-linux-mm@kvack.org Return-Path: To: Matthew Wilcox , "Wichert, Gerhard" Cc: linux-kernel@vger.rutgers.edu, linux-mm@kvack.org List-ID: > -----Ursprungliche 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/