On Wed, May 9, 2012 at 8:54 AM, Eric Dumazet <[email protected]> wrote: > On Wed, 2012-05-09 at 08:47 -0700, Dave Taht wrote: >> Doing (or leveraging) the timestamp on actual ingress to the system, >> rather than entrance to the exiting queue, more accurately will >> compensate for overall system loading and the overhead of traversing >> 3+ pages of function calls to get it from the >> entrance point to the exit, and should result in 'tighter' results. > > > Most qdiscs dont need this timestamp, so it would add overhead in fast > path. > > Also, the delta between 'entering' qdisc layer and entering codel > enqueue is almost a constant for a given qdisc/filter setup, and less > than one us : > > If you really want to take it into account, replace 'target 5000us' by > 'target 5001 us'
In the special case of routers and switches with codel on by default, I think it would help. I can code it up.... > > -- Dave Täht SKYPE: davetaht US Tel: 1-239-829-5608 http://www.bufferbloat.net _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
