Messages in this thread | | | From | cd_smith@ou ... | Date | Sat, 31 Jul 1999 21:08:38 -0500 (CDT) | Subject | zero-cost SCHED_IDLE patch |
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Hi,
Just a summary of my experiences with the SCHED_IDLE patch that was posted here a while ago (I'd give credit, but I don't remember who posted it; you can check the archives if you're interested). I just spent the last seven or eight hours running various combinations of bonnie and lmbench in various combinations of SCHED_IDLE and SCHED_OTHER without problems. I didn't include any POSIX RT processes because from the way I interpret the list conversation, the deadlock potential already exists in that case. The only bug I've found was a rather silly little issue with Rik's rtnice utility.
The one thing I've been too lazy to do is to actually compare a bonny on an RT kernel with lmbench in the background (or vice versa) with the equivalent lmbench or bonnie without SCHED_IDLE support in the kernel. I'll do that later tonight and post numbers... it requires that I retrieve a new copy of Linux over a 28.8 modem because I lost my clean tar file to get a kernel without SCHED_IDLE.
While I'm doing this, anyone got any other apps that are more likely to hit some nasty kernel locking situations?
Chris Smith <cd_smith@ou.edu>
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