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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> |
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