On 13/6/20 6:12 am, Samuel Sieb wrote:
On 6/12/20 10:17 AM, Gordon Messmer wrote:
On 6/11/20 10:24 PM, Samuel Sieb wrote:
You can also specify that certain cores are dedicated to certain
processes and the kernel won't schedule anything else on them.
It looks like you can do that using a boot-time kernel argument
(isolcpus), or by creating new exclusive cpusets. I wasn't
previously aware of those options. As far as I can tell, though, you
won't get that effect from merely pinning the guest to a set of CPUs.
You're right, there are two sides. There's restricting the process to
certain cores and there's dedicating cores to certain processes.
The origonal reason for this thread was the issue with DMESG seeming to
indicate a possible hardware issue on what looked to be core 7, or
whether is was just that the monitoring process couldn't access the core
at the time.
Sharing of lpars becomes a moot point if you are running a vm client
under windows or linux, setting up lshaped lpars only really becomes
relevant when the vm os is using the cpu and all your systems, windows
or linux or anything else are all running in vms, where you can
configure the sharing/exclusivity of the cpus/cores to be managed by the
vm os. Having said this though the cpus potentially still have to be
shared between the vm os and the vm images, unless the vm os has the
capability of reserving cpus/cores for itself and farming out the rest,
in which case the cpu settings in the vm images are only relevant to
whether or not the vm images themselves will share cpus with each other.
regards,
Steve
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