Re: [PATCH] Prefaulting
From: Christoph Lameter
Date: Wed Mar 16 2005 - 14:40:34 EST
On Fri, 11 Mar 2005, Andrew Morton wrote:
> > 200 MB allocation
> >
> > Mb Rep Thr CLine User System Wall flt/cpu/s fault/wsec
> > 200 3 1 1 0.02s 0.48s 0.05s860119.275 859918.989
> > 200 3 1 1 0.02s 0.46s 0.04s886129.730 886551.621
> > 200 3 1 1 0.01s 0.47s 0.04s887920.166 886855.775
>
> But the system time went through the roof. Would that be accounting
> inaccuracy?
Redoing the test with 2.6.11.3-bk2 on AMD64(i386 mode) 1G Ram
unpatched:
Mb Rep Thr CLine User System Wall flt/cpu/s fault/wsec
200 3 1 1 0.00s 0.17s 0.01s844090.542 845814.978
200 3 1 1 0.00s 0.17s 0.01s853466.095 853376.002
200 3 1 1 0.00s 0.17s 0.01s853466.095 855138.626
200 3 1 1 0.00s 0.17s 0.01s848750.083 847934.815
200 3 1 1 0.00s 0.17s 0.01s848754.773 848248.554
200 3 1 1 0.00s 0.17s 0.01s844085.903 843914.312
200 3 1 1 0.01s 0.16s 0.01s848750.083 850573.694
200 3 1 1 0.00s 0.17s 0.01s844090.542 845451.843
prefault patch /proc/sys/vm/max_prealloc_order set to 4
Mb Rep Thr CLine User System Wall flt/cpu/s fault/wsec
200 3 1 1 0.00s 0.17s 0.01s848750.083 847902.050
200 3 1 1 0.00s 0.17s 0.01s853466.095 853565.693
200 3 1 1 0.00s 0.17s 0.01s848750.083 849595.115
200 3 1 1 0.00s 0.17s 0.01s848754.773 848628.162
200 3 1 1 0.00s 0.17s 0.01s844090.542 844554.657
200 3 1 1 0.00s 0.17s 0.01s848754.773 848590.654
200 3 1 1 0.00s 0.17s 0.01s848750.083 848792.295
200 3 1 1 0.00s 0.17s 0.01s844090.542 846406.904
Must have been something wrong with the test.
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