On Wed, 2013-05-29 at 15:13 +0200, Jesper Dangaard Brouer wrote: > I recently discovered that the (traffic control) tc linklayer > calculations for ATM/ADSL have been broken by: > commit 56b765b79 (htb: improved accuracy at high rates). > > Thus, people shaping on ADSL links, using e.g.: > tc class add ... htb rate X ceil Y linklayer atm overhead 10 > > Will no-longer get ATM cell tax/overhead adjusted. > > How can we solve/fix this? > Perhaps we can change to use the "stab" system instead (as it does > not seem to be broken by the commit). > > But how do we facilitate a change to use "stab" system (for all the > scripts using the old option)? > > Can we change the iproute2/tc command to handle this transparently, or > should we give an error/warning if someone uses "tc" and "linklayer" on > a kernel above v.3.8. ? > > > History: > - My linklayer ATM changes appeared in kernel 2.6.24 (and iproute2 2.6.25) > - The STAB changes appeared in kernel 2.6.27 >
Hi Jesper stab suffers from the same problem : its table driven, so works only for packet smaller than a given size. I am not sure it will solve the ATM logic (with the 5 bytes overhead per 48 bytes cell) btw, even on old kernels : _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
