El dom, 20-05-2007 a las 10:59 -0700, Arjan van de Ven escribió: > Santiago Gala wrote: > > I see that in most if not all x86* machines interrupt 0 is assigned to > > the timer interrupt, not sure about other architectures. > > > > A test in http://powertop.googlecode.com/svn/trunk/powertop.c > > > > > > if (nr > 0 && delta > 0) > > push_line(line, delta); > > > > makes it skip interrupt 0. While it is designed to skip over NMI, LOC, > > etc., it is missing a valid value. > > > > the irq 0 is skipped on purpose; at least if you have a NO_HZ kernel, > any wakeup there would be double counted by any of the other timers in > the kernel.... so at minimum I'd have to subtract all known timers > from it first. Hmmm.. I'll look into that.
Didn't know this, it seems relevant for machines like mine (no NO_HZ), and I've seen comments on IRC along the lines of "will CONFIG_HZ=1000 be a problem?..." Maybe the test could be something like if(nonohz && delta >0), or something similar, so that it gets added only for configuration without CONFIG_NO_HZ BTW, I commuted to Madrid today, and using powertop I was able to keep my machine at ~10W, which was actually very useful, and about 2-3W less than before using it. I'm waiting for NO_HZ landing at x86_64. :) Thanks and keep with the good work! Santiago _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
