On Sun, 6 Aug 2006, David Miller wrote: > From: Steven Rostedt <[EMAIL PROTECTED]> > Date: Mon, 7 Aug 2006 01:34:56 -0400 (EDT) > > > My suggestion would be to separate that tg3_timer into 4 different > > timers, which is what it actually looks like. > > Timers have non-trivial cost. It's cheaper to have one and > vector off to the necessary operations each tick internalls. > > That's why it's implemented as one timer. >
hrtimers don't have the cost of a normal timer. And that's why I suggested to convert them. There's a much bigger cost in a single timer that always times out than 3 hrtimers. hrtimers are expected to timeout, but timers are not. Of the 4 timers, only one is a timeout. The other three expire every time, forcing the timer wheel into effect. Even though it's one timer implementing 4, it's expensive to use it as a watchdog. -- Steve - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
