tbench 192 "failed to start 192 clients" on 2.5.64

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On quad Xeon P3, tbench 192 on some 2.5 kernels have been giving this lately:
FAILED TO START 192 CLIENTS (started 190)

The number of clients started varies from 168 - 190 (should be 192).

For the clients that don't start, the logfile shows:
error reading header

The kernel's labeled "badrun" had this behaviour.
There has been no problem running tbench 64 on this machine.

2.5.54-mm3 112.54 MB/second
2.5.55 120.79
2.5.56 117.46
2.5.58 118.46
2.5.59 119.11
2.5.59-mjb3 116.85
2.5.59-mm2 841.02 badrun
2.5.59-mm5 117.93
2.5.59-mm6 841.27 badrun
2.5.59-mm7 119.31
2.5.59feral 119.87
2.5.60bk3 840.98 badrun
2.5.62 119.83
2.5.62-mjb2 119.00
2.5.62-mm2 818.36 badrun
2.5.63 118.21
2.5.63-mjb2 119.60
2.5.63-mm2-dline 818.34 badrun
2.5.64 818.36 badrun

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