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450b306e54
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 1ac627024d)
29 lines
854 B
Diff
29 lines
854 B
Diff
--- a/ath10k-4.19/htt.h
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+++ b/ath10k-4.19/htt.h
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@@ -237,7 +237,11 @@ enum htt_rx_ring_flags {
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};
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#define HTT_RX_RING_SIZE_MIN 128
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+#ifndef CONFIG_ATH10K_SMALLBUFFERS
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#define HTT_RX_RING_SIZE_MAX 2048
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+#else
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+#define HTT_RX_RING_SIZE_MAX 512
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+#endif
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#define HTT_RX_RING_SIZE HTT_RX_RING_SIZE_MAX
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#define HTT_RX_RING_FILL_LEVEL (((HTT_RX_RING_SIZE) / 2) - 1)
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#define HTT_RX_RING_FILL_LEVEL_DUAL_MAC (HTT_RX_RING_SIZE - 1)
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--- a/ath10k-5.2/htt.h
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+++ b/ath10k-5.2/htt.h
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@@ -225,7 +225,11 @@ enum htt_rx_ring_flags {
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};
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#define HTT_RX_RING_SIZE_MIN 128
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+#ifndef CONFIG_ATH10K_SMALLBUFFERS
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#define HTT_RX_RING_SIZE_MAX 2048
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+#else
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+#define HTT_RX_RING_SIZE_MAX 512
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+#endif
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#define HTT_RX_RING_SIZE HTT_RX_RING_SIZE_MAX
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#define HTT_RX_RING_FILL_LEVEL (((HTT_RX_RING_SIZE) / 2) - 1)
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#define HTT_RX_RING_FILL_LEVEL_DUAL_MAC (HTT_RX_RING_SIZE - 1)
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