These patch sets are quite invasive for a stable kernel. It looks like
the default behavior is untouched if cq_cpumask is zero. However, I
would like to see some discussion with upstream as to the efficacy of
IRQ affinity with this device.
Mykyta - can you develop and send a patch for current upstream review ?
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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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
Status in linux source package in Bionic:
New
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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