Re: Should Fedora switch to full kernel preemption (CONFIG_PREEMPT=y)?

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Dne 20. 05. 23 v 22:43 Demi Marie Obenour napsal(a):
I noticed that by default, Qubes OS has voluntary kernel preemption
as opposed to full preemption.  I found that enabling full preemption
(preempt=full on kernel command line) makes the system significantly
more responsive under heavy I/O load.  In particular, if I build a
kernel in a Qubes OS VM, it significantly degrades responsiveness
without preempt=full.  With preempt=full, the system remains
responsive.  The storage stack used is LVM thin provisioning on LUKS,
and I have observed significant CPU usage in dom0 kernel threads with
names that indicate they are related to dm-thin and dm-crypt.

The kernel config used by the Qubes kernel package I use (6.1.28) is
based on Fedora 37’s config, and Marek Marczykowski-Górecki (CCd)
indicated that the same arguments apply to Fedora.  Therefore, I am
asking if Fedora should use full kernel preemption by default.


Hi Demi


Could you please provide   'dmsetup table'   - so we could see how doe your device stack looks like ?

Aren't you disabling work-queues on the table line for crypt targets ?


Regards


Zdenek
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