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  1. 18 9月, 2020 2 次提交
  3. 27 8月, 2020 1 次提交
  5. 31 7月, 2020 4 次提交
  7. 31 5月, 2020 7 次提交
  9. 28 5月, 2020 1 次提交
  11. 27 5月, 2020 2 次提交
  13. 29 4月, 2020 1 次提交
  15. 24 4月, 2020 3 次提交
  17. 20 3月, 2020 1 次提交
  19. 24 2月, 2020 2 次提交
  21. 07 2月, 2020 4 次提交
  23. 14 12月, 2019 1 次提交
  25. 22 11月, 2019 2 次提交
    • K
      mac80211: Implement Airtime-based Queue Limit (AQL) · 3ace10f5
      由 Kan Yan 提交于 
      In order for the Fq_CoDel algorithm integrated in mac80211 layer to operate
effectively to control excessive queueing latency, the CoDel algorithm
requires an accurate measure of how long packets stays in the queue, AKA
sojourn time. The sojourn time measured at the mac80211 layer doesn't
include queueing latency in the lower layer (firmware/hardware) and CoDel
expects lower layer to have a short queue. However, most 802.11ac chipsets
offload tasks such TX aggregation to firmware or hardware, thus have a deep
lower layer queue.

Without a mechanism to control the lower layer queue size, packets only
stay in mac80211 layer transiently before being sent to firmware queue.
As a result, the sojourn time measured by CoDel in the mac80211 layer is
almost always lower than the CoDel latency target, hence CoDel does little
to control the latency, even when the lower layer queue causes excessive
latency.

The Byte Queue Limits (BQL) mechanism is commonly used to address the
similar issue with wired network interface. However, this method cannot be
applied directly to the wireless network interface. "Bytes" is not a
suitable measure of queue depth in the wireless network, as the data rate
can vary dramatically from station to station in the same network, from a
few Mbps to over Gbps.

This patch implements an Airtime-based Queue Limit (AQL) to make CoDel work
effectively with wireless drivers that utilized firmware/hardware
offloading. AQL allows each txq to release just enough packets to the lower
layer to form 1-2 large aggregations to keep hardware fully utilized and
retains the rest of the frames in mac80211 layer to be controlled by the
CoDel algorithm.
Signed-off-by: NKan Yan <kyan@google.com>
[ Toke: Keep API to set pending airtime internal, fix nits in commit msg ]
Signed-off-by: NToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20191119060610.76681-4-kyan@google.comSigned-off-by: NJohannes Berg <johannes.berg@intel.com>
      3ace10f5
    • T
      mac80211: Import airtime calculation code from mt76 · db3e1c40
      由 Toke Høiland-Jørgensen 提交于 
      Felix recently added code to calculate airtime of packets to the mt76
driver. Import this into mac80211 so we can use it for airtime queue limit
calculations.

The airtime.c file is copied verbatim from the mt76 driver, and adjusted to
be usable in mac80211. This involves:

- Switching to mac80211 data structures.
- Adding support for 160 MHz channels and HE mode.
- Moving the symbol and duration calculations around a bit to avoid
  rounding with the higher rates and longer symbol times used for HE rates.

The per-rate TX rate calculation is also split out to its own function so
it can be used directly for the AQL calculations later.
Signed-off-by: NToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20191119060610.76681-3-kyan@google.com
[fix HE_GROUP_IDX() to use 3 * bw, since there are 3 _gi values]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
      db3e1c40
  27. 11 9月, 2019 1 次提交
  29. 31 7月, 2019 1 次提交
  31. 29 7月, 2019 2 次提交
  33. 26 7月, 2019 4 次提交
  35. 20 6月, 2019 1 次提交