On 14 Mar, 2011, at 9:26 pm, Dave Täht wrote: > Over the weekend, Dan Siemons uncovered a possible bad interaction > between ECN and the default pfifo_fast qdisc in Linux. > > http://www.coverfire.com/archives/2011/03/13/pfifo_fast-and-ecn/
This seems to be more complicated that it appears. It looks as though Linux has re-used the LSB of the old TOS field for some "link local" flag which is used by routing. It's not immediately obvious whether pfifo_fast is using this new interpretation though. If it isn't, the fix should be to remove the RTO_ONLINK bit from the mask it's using on the tos field. The other half of the mask correctly excludes the ECN bits from the field. - Jonathan _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
