Re: [PATCH] implement nice support across physical cpus on SMP

[Carlos Carvalho]

Con Kolivas (kernel@xxxxxxxxxxx) wrote on 7 May 2005 23:42:
 >SMP balancing is currently designed purely with throughput in mind. This 
 >working patch implements a mechanism for supporting 'nice' across physical 
 >cpus without impacting throughput.
 >
 >This is a version for stable kernel 2.6.11.*
 >
 >Carlos, if you could test this with your test case it would be appreciated.

Unfortunately it doesn't seem to have any effect:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  184 user1    39  19  7220 5924  520 R 99.9  1.1 209:40.68 mi41
  266 user2    25   0  1760  480  420 R 50.5  0.1  86:36.31 xdipole1
  227 user3    25   0  155m  62m  640 R 49.5 12.3  95:07.89 b170-se.x

Note that the nice 19 job monopolizes one processor while the other
two nice 0 ones share a single processor.

This is really a showstopper for this kind of application :-(
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