Re: idle priority scheduling broken in 7.0-BETA4

Peter Jeremy schreef:
> In August, I reported that idprio was not working in -current.
> Successive upgrades to 7.0-BETA2 and 7.0-BETA4, as well as switching
> to ULE have not resolved the problem.
> 
> The problem affects both boinc-einsteinathome and boinc-setiathome and
> causes them to report "No heartbeat from core client for 31 sec -
> exiting" and get repeatedly restarted.  The boinc compute modules
> (einstein_at_home, seti_at_home etc) use a SysV SHM segment to exchange
> heartbeats with the boinc core client.  The problem is that the core
> client is not being scheduled whilst the compute module is running,
> causing them to die.
> 
> Previously, multiple idprio tasks were round-robined but it seems that
> something has been changed and it appears that the last scheduled task
> is now re-scheduled.
> 
> Has anyone else seen this behaviour?
> 
On my CURRENT 2007-12-23 dualcore (Intel T5600) i386 I get similar behaviour
when using the ULE scheduler.  With the 4BSD scheduler priorities are sometimes
wrong, but boinc tasks (einstein,seti,simap) run continuously until preempted,
they are kept in memory.

last pid:  8141;  load averages:  2.03,  2.14,  2.18    up 0+20:48:27  10:51:54
146 processes: 7 running, 120 sleeping, 19 waiting
CPU states:     % user,     % nice,     % system,     % interrupt,     % idle
Mem: 373M Active, 1040M Inact, 223M Wired, 17M Cache, 112M Buf, 349M Free
Swap: 4062M Total, 4062M Free

  PID USERNAME  PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
 7315 boinc     171  i31 65960K 64904K CPU1   1 187:57 62.89% {einstein_S5R3_4.
 7859 boinc     171  i31 13680K 12552K RUN    0  71:31 60.16% {simap_5.10_i686-
 7859 boinc      20  i31 13680K 12552K kserel 0  71:31 10.45% {simap_5.10_i686-
 5168 boinc       8  i31 41960K 37564K nanslp 0 205:14  0.00% {initial thread}
 5168 boinc       8   19 41960K 37564K nanslp 0 205:14  0.00% {setiathome-5.27.
 7315 boinc      20  i31 65960K 64904K ksesig 0 187:57  0.00% {einstein_S5R3_4.
 7315 boinc      20  i31 65960K 64904K kserel 0 187:57  0.00% {einstein_S5R3_4.
 7859 boinc      20  i31 13680K 12552K ksesig 0  71:31  0.00% {simap_5.10_i686-
22403 boinc     171  i31  9572K  6700K select 1   0:32  0.00% boinc_client


Rene
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