Hi Juraj,
+ [email protected]
For those curious to learn more, here is the cpusets kernel
documentation [0] and cpuset manpage [1].
Thanks for the heads up!
-daw-
[0]
https://www.kernel.org/doc/Documentation/admin-guide/cgroup-v1/cpusets.rst
[1] https://manpages.ubuntu.com/manpages/jammy/man7/cpuset.7.html
On 12/5/2022 5:44 AM, Juraj Linkeš wrote:
Hello CSIT devs,
While looking for possible causes for the 3n-tsh VM testcase timeouts,
Tianyu from arm found out that the isolcpus kernel command line
parameter has been deprecated. It seems that no cores are actually
being isolated:
# altra SUT
jlinkes@jlinkes:~/workspace$ alt1-perf cat /proc/self/status | grep
Cpus_allowed_list
Cpus_allowed_list: 0-159
# icelake SUT
jlinkes@jlinkes:~/workspace$ ssh [email protected] cat
/proc/self/status | grep Cpus_allowed_list
Cpus_allowed_list: 0-127
# snowridge SUT
jlinkes@jlinkes:~/workspace$ ssh [email protected] cat
/proc/self/status | grep Cpus_allowed_list
Cpus_allowed_list: 0-23
# cascadelake SUT
jlinkes@jlinkes:~/workspace$ ssh [email protected] cat
/proc/self/status | grep Cpus_allowed_list
Cpus_allowed_list: 0-95
The kernel docs [0] themselves mention that the parameter has been
deprecated and we should use cpusets instead.
Looks like the deprecation could have broader implications in CSIT.
Regards,
Juraj
[0]
https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt
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