[DragonFlyBSD - Bug #1878] (Closed) dsched_fq and occasional console freeze

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Sat Nov 27 08:51:44 PST 2021

Issue #1878 has been updated by tuxillo.

Description updated
Category set to Kernel
Status changed from New to Closed
Assignee deleted (0)

dsched removed in commit:3573cf7bf66147ca2e7b19f6d8db6b50b21cd63a

Bug #1878: dsched_fq and occasional console freeze

* Author: qhwt.dfly
* Status: Closed
* Priority: Normal
* Category: Kernel
* Target version: 6.2
When the current dsched policy is set to fq, the console (or ssh connection)
occasionally freezes (becomes unresponsive, even to ctrl+T).  However,
I can still switch between ttyvN terminals by pressing Alt+Fn keys,
and drop to DDB (I remember reading a similar description in the past,
but I couldn't find the message in my mailbox).

Unfortunately, the kernel dumping locks up too in that case
(no progress is printed on the screen), so no vmcore is available
at the moment.  FWIW, dsched_fq is loaded as kernel module and the policy
is set via /etc/rc.d/sysctl.

This is on an Atom D510 with 4G bytes of RAM and running a very recent
-DEVELOPMENT x86_64 kernel; I haven't tried it on a PC running 32-bit
version yet.

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