[Make-wifi-fast] [RFC/RFT 1/5] mac80211: skip netdev queue control with software queuing
julian.calaby at gmail.com
Sun Jun 5 22:26:30 EDT 2016
On Sat, Jun 4, 2016 at 2:51 AM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> From: Michal Kazior <michal.kazior at tieto.com>
> Qdiscs are designed with no regard to 802.11
> aggregation requirements and hand out
> packet-by-packet with no guarantee they are
> destined to the same tid. This does more bad than
> good no matter how fairly a given qdisc may behave
> on an ethernet interface.
> Software queuing used per-AC netdev subqueue
> congestion control whenever a global AC limit was
> hit. This meant in practice a single station or
> tid queue could starve others rather easily. This
> could resonate with qdiscs in a bad way or could
> just end up with poor aggregation performance.
> Increasing the AC limit would increase induced
> latency which is also bad.
> Disabling qdiscs by default and performing
> taildrop instead of netdev subqueue congestion
> control on the other hand makes it possible for
> tid queues to fill up "in the meantime" while
> preventing stations starving each other.
> This increases aggregation opportunities and
> should allow software queuing based drivers
> achieve better performance by utilizing airtime
> more efficiently with big aggregates.
> Signed-off-by: Michal Kazior <michal.kazior at tieto.com>
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Email: julian.calaby at gmail.com
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