From mboxrd@z Thu Jan 1 00:00:00 1970 From: john stultz Date: Tue, 18 Nov 2003 01:08:40 +0000 Subject: Re: [RFC][PATCH] linux-2.4.23-pre9_ia64-cyclone_A0 Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Mon, 2003-11-17 at 17:02, john stultz wrote: > On Mon, 2003-11-17 at 16:23, Bjorn Helgaas wrote: > > SGI uses a similar design in 2.4, but apparently there are some > > issues with it: > > http://www.gelato.unsw.edu.au/linux-ia64/0310/6973.html > > > > I'd like to see those issues resolved and the Cyclone support > > put into the same framework as the SGI work. > > Hmmm. I think I've grasped the issue there. It seems the problem is not > calculating the equivalent of delay_at_last_interrupt found in the i386 > time code. I'll see if I cannot come up with something similar. Actually, on second though, I don't believe this is necessary as every tick we increment last_tick_cyclone by one tick, rather then zeroing it out. In that way, even if the interrupt is delayed we don't lose time. I may be missing some subtlety, but I think the point made above was considered in my patch. thanks -john