On Thu, Dec 22, 2011 at 11:31:45AM +0100, Luigi Rizzo wrote: > On Wed, Dec 21, 2011 at 04:52:50PM -0800, Steve Kargl wrote: > > > > I have placed several files at > > > > http://troutmask.apl.washington.edu/~kargl/freebsd > > > > dmesg.txt --> dmesg for ULE kernel > > summary --> A summary that includes top(1) output of all runs. > > sysctl.ule.txt --> sysctl -a for the ULE kernel > > ktr-ule-problem-kargl.out.gz
I've replaced the original version of the ktr file with a new version. The old version was corrupt due to my failure to set 'sysctl debug.ktr.mask=0' prior to the dump. > One explanation for taking 1.5-2x times is that with ULE the > threads are not migrated properly, so you end up with idle cores > and ready threads not running (the other possible explanation > would be that there are migrations, but they are so frequent and > expensive that they completely trash the caches. But this seems > unlikely for this type of task). I've used schedgraph to look at the ktrdump output. A jpg is available at http://troutmask.apl.washington.edu/~kargl/freebsd/ktr.jpg This shows the ping-pong effect where here 3 processes appear to be using 2 cpus while the remaining 2 processes are pinned to their cpus. -- Steve _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
