Re: cgroup, RT reservation per core(s)?

Thanks for the quick reply.

On Mon, Feb 9, 2009 at 7:52 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
On Mon, 2009-02-09 at 19:30 +0000, Rolando Martins wrote:
Hi,
I would like to have in a quad-core, 2 cores totally (100%) dedicated
to RT tasks (SCHED_RR and SCHED_FIFO) and the other 2 cores with
normal behavior, better said, allowing SCHED_OTHER & SCHED_FIFO &
SCHED_RR tasks but still with a RT reservation. Follows an example:


# Setup first domain (cpu 0,1)
echo 0-1 > /dev/cgroup/0/cpuset.cpus
echo 0 > /dev/cgroup/0/cpuset.mems

# Setup RT bandwidth for firstdomain (80% for RT, 20% others)
echo 1000000 > /dev/cgroup/0/cpu.rt_period_us
echo 800000 > /dev/cgroup/0/cpu.rt_runtime_us


# Setup second domain (cpu 2,3)
mkdir /dev/cgroup/1
echo 2-3 > /dev/cgroup/1/cpuset.cpus
echo 0 > /dev/cgroup/1/cpuset.mems

# Setup RT bandwidth for second domain (100% for RT)
echo 1000000 > /dev/cgroup/1/cpu.rt_period_us
echo 1000000 > /dev/cgroup/1/cpu.rt_runtime_us

Is there anyway for doing this?

Nope, but why do you need bandwidth groups if all you want is a full
cpu?

Just the cpuset should be plenty
You have a point;)


I should have elaborated this more:

root
----|----
| |
(0.5 mem) 0 1 (100% rt, 0.5 mem)
---------
| | |
2 3 4 (33% rt for each group, 33% mem
per group(0.165))
Rol
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