[BENCHMARK] 2.5.42-mm2 contest results

[BENCHMARK] 2.5.42-mm2 contest results

[Con Kolivas]

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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

Didn't believe it the first time so I ran it twice more and ran 2.5.42 again 
to make sure something didn't change on my machine, but definitely this was 
slower than 2.5.42. When the kernel compile starts on the flushed ram machine 
with no background load a lot more disk activity seems to occur for the first 
five or so seconds compared to other kernels. I'm not sure if this is related 
to the way the memory and swap is flushed prior to the test or just this 
kernel. This may have affected all the following results too.

process_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          95.5    75      31      28      1.42
2.5.42 [1]              98.0    69      44      33      1.46
2.5.42-mm2 [2]          104.5   72      31      30      1.56

Slower again, without an increase in the loads.

ctar_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          92.1    81      1       5       1.37
2.5.42 [1]              96.7    80      1       7       1.44
2.5.42-mm2 [2]          102.3   79      1       6       1.52

Slower; lack resolution of number of loads makes it difficult to determine if 
it's significant. Same with a few of the other loads below.

xtar_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          215.9   34      3       7       3.21
2.5.42 [1]              112.7   66      1       7       1.68
2.5.42-mm2 [2]          195.0   41      2       6       2.90

Close to 2.5.41-mm3. Not enough runs to show if it is significant

io_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          312.4   25      20      11      4.65
2.5.42 [1]              849.1   9       69      12      12.64
2.5.42-mm2 [2]          250.7   34      15      10      3.73

This is showing an improvement with some of the better io load results shown 
by a 2.5 kernel.

read_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          102.0   74      6       4       1.52
2.5.42 [1]              102.0   75      8       5       1.52
2.5.42-mm2 [2]          109.0   75      7       4       1.62

list_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [1]          95.9    74      1       22      1.43
2.5.42 [1]              97.5    71      1       20      1.45
2.5.42-mm2 [2]          105.3   72      1       24      1.57

mem_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
2.5.41-mm3 [2]          107.1   68      27      2       1.59
2.5.42 [1]              104.0   72      30      3       1.55
2.5.42-mm2 [2]          121.2   65      30      2       1.80

Con
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Re: [BENCHMARK] 2.5.42-mm2 contest results

[Andrew Morton]

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.