Date: Mon, 2 Mar 2009 09:19:12 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: current@freebsd.org Subject: Re: CPU usage inaccuracy for taskqueue Message-ID: <294552.75058.qm@web63905.mail.re1.yahoo.com> In-Reply-To: <259584.14857.qm@web63903.mail.re1.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--- On Sun, 3/1/09, Barney Cordoba <barney_cordoba@yahoo.com> wrote: > From: Barney Cordoba <barney_cordoba@yahoo.com> > Subject: Re: CPU usage inaccuracy for taskqueue > To: current@freebsd.org > Date: Sunday, March 1, 2009, 10:46 AM > --- On Sun, 3/1/09, Barney Cordoba > <barney_cordoba@yahoo.com> wrote: > > > From: Barney Cordoba <barney_cordoba@yahoo.com> > > Subject: CPU usage inaccuracy for taskqueue > > To: current@freebsd.org > > Date: Sunday, March 1, 2009, 10:22 AM > > 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 > > > Sorry for the ugly post. It looks ok in Yahoo and then gets > all jumbled. > The gist of the top output: > > 100.00% idle: cpu3 > 100.00% idle: cpu2 > 100.00% idle: cpu1 > 99.17% idle: cpu0 > 7.47% igb1 taskq > > The task is show 7.5% usage and < 1% usage is shown by > the cpu idle > threads. > > Barney > Can someone point me to the module / source file where this accounting *should* take place? BC
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?294552.75058.qm>