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Subjectpipe and af/unix latency differences between aa and jam on smp
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The -jam patchset is interesting because it starts out
with the entire -aa patchset and adds a few things.

Sometimes small differences in LMbench between -jam and -aa are
just CPU bounces on SMP. The difference for pipe and af/unix latency
only appears on SMP too, but it is very consistent. (My k6/2
has small differences between -aa and -jam for pipe and af/unix
latency).

You will know better what could make the difference:

This is the averages:

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
kernel Pipe AF/Unix
----------------- ------- -------
2.4.19-pre10-aa4 33.941 70.216
2.4.19-pre10-jam2 7.877 16.699


These are the individual runs:

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
OS Pipe AF/Unix
----------------------------- ------- ------
Linux 2.4.19-pre10-aa4 33.999 73.024
Linux 2.4.19-pre10-aa4 35.829 73.261
Linux 2.4.19-pre10-aa4 16.710 74.830
Linux 2.4.19-pre10-aa4 37.221 66.354
Linux 2.4.19-pre10-aa4 36.259 68.433
Linux 2.4.19-pre10-aa4 36.429 68.215
Linux 2.4.19-pre10-aa4 35.379 77.147
Linux 2.4.19-pre10-aa4 29.300 73.641
Linux 2.4.19-pre10-aa4 35.798 64.875
Linux 2.4.19-pre10-aa4 35.691 75.433
Linux 2.4.19-pre10-aa4 35.372 73.398
Linux 2.4.19-pre10-aa4 33.516 69.183
Linux 2.4.19-pre10-aa4 34.986 69.254
Linux 2.4.19-pre10-aa4 33.743 69.893
Linux 2.4.19-pre10-aa4 32.679 71.900
Linux 2.4.19-pre10-aa4 34.131 71.812
Linux 2.4.19-pre10-aa4 33.444 72.454
Linux 2.4.19-pre10-aa4 36.531 71.956
Linux 2.4.19-pre10-aa4 37.838 69.731
Linux 2.4.19-pre10-aa4 34.359 71.522
Linux 2.4.19-pre10-aa4 33.286 71.609
Linux 2.4.19-pre10-aa4 32.361 43.533
Linux 2.4.19-pre10-aa4 31.716 74.131
Linux 2.4.19-pre10-aa4 35.218 72.001
Linux 2.4.19-pre10-aa4 36.709 67.795

Linux 2.4.19-pre10-jam2 7.9977 14.495
Linux 2.4.19-pre10-jam2 7.8406 14.044
Linux 2.4.19-pre10-jam2 7.7899 14.006
Linux 2.4.19-pre10-jam2 7.8584 13.819
Linux 2.4.19-pre10-jam2 7.8379 14.453
Linux 2.4.19-pre10-jam2 7.8781 14.156
Linux 2.4.19-pre10-jam2 7.8881 14.238
Linux 2.4.19-pre10-jam2 7.9833 14.168
Linux 2.4.19-pre10-jam2 7.7772 78.765
Linux 2.4.19-pre10-jam2 8.0816 13.703
Linux 2.4.19-pre10-jam2 7.8605 14.042
Linux 2.4.19-pre10-jam2 7.7982 13.883
Linux 2.4.19-pre10-jam2 7.6362 14.286
Linux 2.4.19-pre10-jam2 7.7480 13.989
Linux 2.4.19-pre10-jam2 7.9262 13.947
Linux 2.4.19-pre10-jam2 8.0904 14.014
Linux 2.4.19-pre10-jam2 7.8480 14.310
Linux 2.4.19-pre10-jam2 7.7982 14.171
Linux 2.4.19-pre10-jam2 7.9776 14.234
Linux 2.4.19-pre10-jam2 7.7931 14.125
Linux 2.4.19-pre10-jam2 7.8553 14.110
Linux 2.4.19-pre10-jam2 7.7294 14.285
Linux 2.4.19-pre10-jam2 8.3361 14.131
Linux 2.4.19-pre10-jam2 7.7797 14.039
Linux 2.4.19-pre10-jam2 7.8265 14.043

For pipe and af/unix bandwidth, the difference appears to just be a
CPU bounce here and there.

jam patchsets are at:
http://giga.cps.unizar.es/~magallon/linux/

--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html

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