net: qualcomm: rmnet: Set pacing shift

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The real device over which the rmnet devices are installed also
aggregate multiple IP packets and sends them as a single large
aggregate frame to the hardware. This causes degraded throughput
for TCP TX due to bufferbloat.

To overcome this problem, pacing shift value of 8 is set using the
sk_pacing_shift_update() helper. This value was determined based
on experiments with a single stream TCP TX using iperf for a
duration of 30s.

Pacing shift | Observed data rate (Mbps)
          10 | 9
           9 | 140
           8 | 146 (Max link rate)

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Subash Abhinov Kasiviswanathan 2018-01-07 11:36:35 -07:00 • committed by David S. Miller

parent b23e722ed6

commit 4e8683a95c

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drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

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