Date: Sun, 1 Mar 2009 07:22:00 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: current@freebsd.org Subject: CPU usage inaccuracy for taskqueue Message-ID: <845248.52556.qm@web63904.mail.re1.yahoo.com>
next in thread | raw e-mail | index | archive | help
I've been playing with the ige driver and as a test shifted the entire
receive load to a task instead of doing it in the msix_rx routine by simply
launching a receive task whenever an interrupt is generated. When doing so
and applying a moderate load, top readings show:
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 11 root 1 171 ki31 0K 8K RUN 3 6:31 100.00% idle: cpu3 12 root 1 171 ki31 0K 8K CPU2 2 6:30 100.00% idle: cpu2 13 root 1 171 ki31 0K 8K CPU1 1 6:29 100.00% idle: cpu1
14 root 1 171 ki31 0K 8K CPU0 0 6:23 99.17% idle: cpu0
42 root 1 -68 - 0K 8K - 0 0:07 7.47% igb1 taskq
clearly the cpu idle thread values aren't correct. This is the case in
both 7.0 and 7.1. Since the point of my testing is to experiment with
schemes for spreading loads better, I'm not able to learn anything with
the lack of usable feedback. Is there a simple fix?
Barney
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?845248.52556.qm>