Re: [BENCHMARK] 2.5.42-mm2 contest results

From: Andrew Morton (akpm@digeo.com)
Date: Sun Oct 13 2002 - 15:53:03 EST

Con Kolivas wrote:
>
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> Here are the surprisingly different results from 2.5.42-mm2 with the contest
> benchmark (http://contest.kolivas.net). This was run with pagetable sharing
> enabled. Older results hidden for clarity.
>
> noload:
> Kernel [runs] Time CPU% Loads LCPU% Ratio
> 2.5.41-mm3 [1] 74.4 93 0 0 1.11
> 2.5.42 [2] 72.5 93 0 0 1.08
> 2.5.42-mm2 [3] 79.0 92 0 0 1.18
>

Well something is burning CPU there, and I do not know what it is.
Things are normal here:

With 2.5.42-mm2++, shared pagetables enabled:
make -j6 bzImage 416.97s user 33.94s system 374% cpu 2:00.28 total

With 2.5.42+last night's BK:
make -j6 bzImage 416.09s user 33.04s system 370% cpu 2:01.15 total

With 2.5.42:
make -j6 bzImage 416.56s user 32.49s system 375% cpu 1:59.69 total

So. Could you please profile the `noload' run? Just enable oprofile
and local IO APIC and do:

- add "idle=poll" to your kernel boot commandline
- sudo rm -rf /var/lib/oprofile
- sudo op_start --vmlinux=/boot/vmlinux --ctr0-event=CPU_CLK_UNHALTED \
  --ctr0-count=600000
- time make -j4 bzImage ; sudo op_stop
- oprofpp -l -i /boot/vmlinux
- sudo killall oprofiled

(Do the `make' quickly after the op_start to avoid bogus idle time).

Thanks.
-
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This archive was generated by hypermail 2b29 : Tue Oct 15 2002 - 22:00:47 EST