Messages in this thread | | | Date | Sun, 13 Oct 2002 13:53:03 -0700 | From | Andrew Morton <> | Subject | Re: [BENCHMARK] 2.5.42-mm2 contest results |
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Con Kolivas wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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).
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