24 Jan
2013
24 Jan
'13
6:38 p.m.
Quoth Russell Brown.....
Thank you for tracing the problem. Given the high CPU load observed I
probably have no choice but to rework the SAK pipe code in tdm to use a
TQSocketNotifier to avoid busywaiting. Opening a bug report on this issue
would help us track the problem and any potential fixes that are committed
to GIT; you can also attach your patch to the new bug report.
Thanks!
Tim
3.5.13 kdm_greet eats lots of CPU.
As a followup to my own post (bad form I know :-)....
I've made a change to kdm that adds an option 'UseKDMCTL' (like UseSAK)
in kdmrc that can turn off the monitoring of the kdmctl FIFO (defaults
to true so it won't change anything).
Turning off this monitoring (and thence the loop where Tim's 500usec
sleep was inserted to try and reduce the load) drops the CPU usage of
idle kdm_greet processes from significant to undetectable (as background
I'm trying to configure a 30+ Xterminal system and having 30 kdm_greets
trying to eat ~10% CPU each isn't good).