Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Patch added: "0001-nvme-add-cq_cpulist-module-parameter.patch"
https://bugs.launchpad.net/bugs/1831566/+attachment/5268711/+files/0001-nvme-add-cq_cpulist-module-parameter.patch
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https://bugs.launchpad.net/bugs/1831566
Title:
[realtime app] not possible to redirect drivers/nvme IRQs from
realtime cpuset
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