On Wed, Aug 17, 2016 at 5:17 PM, Eric Dumazet <eric.duma...@gmail.com> wrote: > > From: Eric Dumazet <eduma...@google.com> > > Over the years, TCP BDP has increased a lot, and is typically > in the order of ~10 Mbytes with help of clever Congestion Control > modules. > > In presence of packet losses, TCP stores incoming packets into an out of > order queue, and number of skbs sitting there waiting for the missing > packets to be received can match the BDP (~10 Mbytes) > > In some cases, TCP needs to make room for incoming skbs, and current > strategy can simply remove all skbs in the out of order queue as a last > resort, incurring a huge penalty, both for receiver and sender. > > Unfortunately these 'last resort events' are quite frequent, forcing > sender to send all packets again, stalling the flow and wasting a lot of > resources. > > This patch cleans only a part of the out of order queue in order > to meet the memory constraints. > > Signed-off-by: Eric Dumazet <eduma...@google.com> > Cc: Neal Cardwell <ncardw...@google.com> > Cc: Yuchung Cheng <ych...@google.com> > Cc: Soheil Hassas Yeganeh <soh...@google.com> > Cc: C. Stephen Gun <c...@google.com> > Cc: Van Jacobson <v...@google.com> > ---
Nice. Acked-by: Neal Cardwell <ncardw...@google.com> neal
