On Tue, 2006-05-16 at 14:54 +0200, Michael Schmitz wrote: > > > Maybe this helps: > > > http://forums.gentoo.org/viewtopic-t-462417.html > > > > Yes, it does. > > > > "JoseJX" write there that ondemand and conservative cannot be used > > on 7xx/74xx processors because of the time required to switch speeds. > > The reason seems to be a rather conservative assumption on the latency > ('probably takes forever') - does it really take more than 10 ms to switch > speeds? The code path on the 7447A models appears to have a settle delay > of 1 ms after the feature call (which boils down to an OUTB, basically), > another 0.1 ms after the low_choose_7447a_dfs call which shouldn't take > very long either. Am I missing something, Ben?
I'm being over conservative bcs of the voltage change > I'd not be surprised if the latency was as low as 2 ms total - can we > profile this reliably in some way? I guess I'll just set the latency to 5 > ms and see what happens ... Last time I looked the on-demand governor was using a workqueue... anything that has a latency of more than a few dozen usec in a workqueue shall be shot... Ben -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
