On Sat, 21 Mar 2009, Stephen Hemminger wrote: > On Sat, 21 Mar 2009 00:43:40 -0700 (Pacific Daylight Time) > "Waskiewicz Jr, Peter P" <[email protected]> wrote: > > > On Sat, 21 Mar 2009, David Miller wrote: > > > > > From: "Waskiewicz Jr, Peter P" <[email protected]> > > > Date: Fri, 20 Mar 2009 23:21:38 -0700 (Pacific Daylight Time) > > > > > > > I see your point, but it is a hack in my opinion. The device will have > > > > 8 > > > > real Tx queues, not 1. I'd much rather go with the original proposal, > > > > since if the code in dev_pick_tx() changed, it could silently break > > > > ixgbe. > > > > > > It can't, if you only advertise one transmit queue the kernel > > > can never ever choose anything other than queue zero. It's > > > impossible. > > > > > > Stephen's right, you guys don't need your select queue override. > > > > > > And if you recall I suspected this from the very beginning. > > > > > > You guys never ever think out of the box, ever... if it's > > > not straightforward, you guys won't got for it. That makes > > > it very frustrating to get anything done. > > > > This patch will break DCB in ixgbe. We need all 8 queues, because the > > user will be assigning tc filters to the sch_multiq qdisc to get traffic > > into priority queues. If we take Stephen's patch and tell the stack we > > have 1 real_num_tx_queues, then we get 1 band in sch_multiq, which makes > > it impossible to assign traffic to priorities 1 through 8: > > > > How does it make sense to say you have 8 bands, but only use one.
That's not how DCB works. We use sch_multiq to identify the traffic we want to put into the 8 bands. So in other words, the user will add tc filters to move the traffic around. We override select queue to filter the rest of the traffic into a single queue, so we don't randomly put traffic into the other hardware priority queues. Either way, thanks for cleaning this up Stephen. It was something I needed to do, and haven't done yet. So I very much appreciate it. Cheers, -PJ Waskiewicz ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel
