It looks like the supplied patch is a no-op. A module parameter is
introduced with a .set function, but the parameter does not have any
write permission specified so the .set function can never execute (since
userspace won't have permission to write to the module parameter file).
module_param_cb(cq_cpulist, &cq_cpulist_ops, NULL, 0);
~~^~
This 0 provided to module_param_cb() is the octal UNIX permissions
argument to module_param_cb(). The correct value should be 0200 in this
case, to specify write-only permission.
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https://bugs.launchpad.net/bugs/1831566
Title:
[realtime app] not possible to redirect drivers/nvme IRQs from
realtime cpuset
Status in linux package in Ubuntu:
Confirmed
Bug description:
We're running realtime application on Ubuntu 16.04 with linux-image
4.15 and found it impossible to get rid of jitter introduced by Intel
NVMe IRQs. I'm providing here a patch which solved the issue for us.
The realtime application is bound to isolated CPUs (one thread per
CPU, nohz_full= in kernel cmdline, all IRQs moved to housekeeping
CPUs), application doesn't use any linux kernel syscalls except in
startup phase so we don't expect any interruptions of the application
from the kernel or HW.
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