Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling

[Con Kolivas <kernel@kolivas.org>]

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Rui Nuno Capela wrote:
> Jack O'Quin wrote:
> 
>>[...] Looking at the graph, it appears that your DSP load is hovering
>>above 70% most of the time.  This happens to be the default threshold
>>for revoking realtime privileges.  Perhaps that is the problem.  Try
>>running it with the threshold set to 90%.  (I don't recall exactly
>>how, but I think there's a /proc/sys/kernel control somewhere.)
>>
> 
> 
> It would be nice to know which one really is :) Here are what I have here:
> 
> # grep . /proc/sys/kernel
> /proc/sys/kernel/bootloader_type:2
> /proc/sys/kernel/cad_pid:1
> /proc/sys/kernel/cap-bound:-257
> /proc/sys/kernel/core_pattern:core
> /proc/sys/kernel/core_uses_pid:1
> /proc/sys/kernel/ctrl-alt-del:0
> /proc/sys/kernel/debug_direct_keyboard:0
> /proc/sys/kernel/domainname:(none)
> /proc/sys/kernel/hostname:lambda
> /proc/sys/kernel/hotplug:/sbin/hotplug
> /proc/sys/kernel/kernel_preemption:1
> /proc/sys/kernel/modprobe:/sbin/modprobe
> /proc/sys/kernel/msgmax:8192
> /proc/sys/kernel/msgmnb:16384
> /proc/sys/kernel/msgmni:16
> /proc/sys/kernel/ngroups_max:65536
> /proc/sys/kernel/osrelease:2.6.11-rc1-RT-V0.7.35-01.0
> /proc/sys/kernel/ostype:Linux
> /proc/sys/kernel/overflowgid:65534
> /proc/sys/kernel/overflowuid:65534
> /proc/sys/kernel/panic:0
> /proc/sys/kernel/panic_on_oops:0
> /proc/sys/kernel/pid_max:32768
> /proc/sys/kernel/printk:3	4	1	7
> /proc/sys/kernel/printk_ratelimit:5
> /proc/sys/kernel/printk_ratelimit_burst:10
> /proc/sys/kernel/prof_pid:-1
> /proc/sys/kernel/sem:250	32000	32	128
> /proc/sys/kernel/shmall:2097152
> /proc/sys/kernel/shmmax:33554432
> /proc/sys/kernel/shmmni:4096
> /proc/sys/kernel/sysrq:1
> /proc/sys/kernel/tainted:0
> /proc/sys/kernel/threads-max:8055
> /proc/sys/kernel/unknown_nmi_panic:0
> /proc/sys/kernel/version:#1 Mon Jan 17 15:15:21 WET 2005
> 
> My eyes can't find anything related, but you know how intuitive these
> things are ;)

He means when using the SCHED_ISO patch. Then you'd have iso_cpu and 
iso_period, which you have neither of so you are not using SCHED_ISO.

Cheers,
Con

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