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brcmfmac experiment for a specific use case - tx throughput maximization for slow CPU with glomming

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Hi,


I've crippled a Raspberry Pi 3 (1 core, 200 MHz) and observed that the
glomming feature has a definite impact on TX performance, but it looks
like at this CPU frequency, the work queue is solicited "too often"
by brcmf_sdio_trigger_dpc() and glomming is only doing 4 packets at
once, resulting in maybe a sub-optimal throughput.


I have a vague idea that deliberately delaying the transmissions so as
to wait for either a small timeout, or the glomming level has been
reached, would be something worth exploring.
But I haven't spent a long time looking at the driver.


I'm just soliciting your advice at this point, I'll do some experiments
also.


Best regards,

-- 
Jérôme




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