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[v2,net-next,0/3] net_sched: allow use of hrtimer slack

Message ID 20200317021251.75190-1-edumazet@google.com
Headers show
Series net_sched: allow use of hrtimer slack | expand

Message

Eric Dumazet March 17, 2020, 2:12 a.m. UTC 
Packet schedulers have used hrtimers with exact expiry times.

Some of them can afford having a slack, in order to reduce
the number of timer interrupts and feed bigger batches
to increase efficiency.

FQ for example does not care if throttled packets are
sent with an additional (small) delay.

Original observation of having maybe too many interrupts
was made by Willem de Bruijn.

v2: added strict netlink checking (Jakub Kicinski)

Eric Dumazet (3):
  net_sched: add qdisc_watchdog_schedule_range_ns()
  net_sched: do not reprogram a timer about to expire
  net_sched: sch_fq: enable use of hrtimer slack

 include/net/pkt_sched.h        | 10 +++++++++-
 include/uapi/linux/pkt_sched.h |  2 ++
 net/sched/sch_api.c            | 21 ++++++++++++++-------
 net/sched/sch_fq.c             | 21 +++++++++++++++++----
 4 files changed, 42 insertions(+), 12 deletions(-)