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Add entry about kbdmux(4) un-locking.

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This commit is contained in:
Maksim Yevmenkin 2009-04-12 19:42:25 +00:00
parent 45452edc37
commit 874379551b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=190974
1 changed files with 10 additions and 0 deletions
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@ -22,6 +22,16 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 8.x IS SLOW:
to maximize performance. (To disable malloc debugging, run
ln -s aj /etc/malloc.conf.)
20090408:
Do not use Giant for kbdmux(4) locking. This is wrong and
apparently causing more problems than it solves. This will
re-open the issue where interrupt handlers may race with
kbdmux(4) in polling mode. Typical symptoms include (but
not limited to) duplicated and/or missing characters when
low level console functions (such as gets) are used while
interrupts are enabled (for example geli password prompt,
mountroot prompt etc.). Disabling kbdmux(4) may help.
20090407:
The size of structs vnet_net, vnet_inet and vnet_ipfw has changed;
kernel modules referencing any of the above need to be recompiled.