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According to many bugreports [0][1][2] the default ath10k-ct kernel
module is unusable on devices with just 64 MiB RAM or with 128 MiB and
dual ath10k cards. The target boards boot but eventually oom-killer
starts to interfere with normal operation, so the current state is
effectively broken.
Since the two patches in question have a performance impact (and
possibly some other unexpected side-effects) a dedicated build variant
is added so that users of the low RAM devices can still benefit from all
the ath10k-ct advantages.
According to testing [3] results, the issue can be experienced even with
"a 256MB device with three radios". Measured performance impact of
implementing small buffers was lowering "the maximum 5 GHz throughput on
an IPQ40xx device without RPS/XPS optimizations from 494/432 Mbit/s for
TCP transfers (download/upload) to 438/343 Mbit/s"
The patches were apparently inspired by QSDK tweaks used by ODMs for the
affected devices.
[0] http://lists.infradead.org/pipermail/openwrt-devel/2019-December/020573.html
[1] https://github.com/openwrt/openwrt/pull/1077
[2] https://bugs.openwrt.org/index.php?do=details&task_id=2664
[3] https://github.com/freifunk-gluon/gluon/pull/1440#issue-195607701
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
[Remove double CONFIG_ATH10K-CT_LEDS entry]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit
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| .. | ||
| 161-ath10k-add-support-for-configuring-management-packet.patch | ||
| 162-ath10k-fix-possible-out-of-bound-access-of-ath10k_ra.patch | ||
| 163-ath10k-fix-incorrect-multicast-broadcast-rate-settin.patch | ||
| 164-ath10k-commit-rates-from-mac80211.patch | ||
| 201-ath10k-4.16_add-LED-and-GPIO-controlling-support-for-various-chipsets.patch | ||
| 202-ath10k-4.16-use-tpt-trigger-by-default.patch | ||
| 203-ath10k-Limit-available-channels-via-DT-ieee80211-fre.patch | ||
| 960-0010-ath10k-limit-htt-rx-ring-size.patch | ||
| 960-0011-ath10k-limit-pci-buffer-size.patch | ||