idle priority scheduling broken in 7.0-BETA4

Peter Jeremy peterjeremy at
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.

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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