idle priority scheduling broken in 7.0-BETA4

Peter Jeremy peterjeremy at optushome.com.au
Thu Jan 3 11:21:18 PST 2008


On Wed, Jan 02, 2008 at 03:31:34AM -1000, Jeff Roberson wrote:
>ah, I'm sorry.  the new line with PRI_FIFO should read PRI_FIFO_BIT.  I 
>tested the patch but not with any idle prio tasks that run forever.

That seems to work and I don't see any problems with it.  There were
seven watchdog restarts over about 3/4 hr whilst the system was doing
a buildworld but this is probably not completely unreasonable.

One oddity I noticed is that setiathome (unlike einstein at home) has one
thread that seems to have lost the idle bit (though that thread appears
to just idle).  This is equivalent to a process increasing its priority
so I wouldn't have expected it.

  PID USERNAME   PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
51503 boinc      171  i31 39944K 33052K RUN      3:43 100.00% setiathome-5.27.i
51503 boinc        8   19 39944K 33052K nanslp   3:43  0.00% setiathome-5.27.i3
   10 root       171 ki31     0K     8K RUN      2:51  0.00% idle
    4 root        -8    -     0K     8K -        0:54  0.00% g_down

Let me know if you really want to get boinc working for yourself.

-- 
Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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