On 1/5/2012 8:46 PM, gene heskett wrote:
> Where can I find some real docs on this isolcpu thingy?
Gene:
Quoting from kernel.org:
isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
Format:
<cpu number>,...,<cpu number>
or
<cpu number>-<cpu number>
(must be a positive range in ascending order)
or a mixture
<cpu number>,...,<cpu number>-<cpu number>
This option can be used to specify one or more CPUs
to isolate from the general SMP balancing and scheduling
algorithms. You can move a process onto or off an
"isolated" CPU via the CPU affinity syscalls or cpuset.
<cpu number> begins at 0 and the maximum value is
"number of CPUs in system - 1".
This option is the preferred way to isolate CPUs. The
alternative -- manually setting the CPU mask of all
tasks in the system -- can cause problems and
suboptimal load balancer performance.
It's straightforward to set this parameter in classic grub. I did a
piece on the Wiki a while ago about how to set this parameter in a grub2
environment
http://wiki.linuxcnc.org/emcinfo.pl/The_Isolcpus_Boot_Parameter_And_GRUB2
Regards,
Kent
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