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From: "Jérôme Carretero" <cJ-ko@zougloub.eu>
To: Franky Lin <franky.lin@broadcom.com>,
	Wright Feng <Wright.Feng@cypress.com>
Cc: Arend van Spriel <arend.vanspriel@broadcom.com>,
	linux-wireless@vger.kernel.org
Subject: brcmfmac experiment for a specific use case - tx throughput maximization for slow CPU with glomming
Date: Wed, 24 May 2017 07:33:43 -0400	[thread overview]
Message-ID: <20170524073326.3a16481b@Vantage> (raw)

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,

--=20
J=C3=A9r=C3=B4me

             reply	other threads:[~2017-05-24 11:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-24 11:33 Jérôme Carretero [this message]
2017-06-01  6:37 ` brcmfmac experiment for a specific use case - tx throughput maximization for slow CPU with glomming Jörg Krause
2017-08-18 11:50   ` Fabio Estevam
2017-08-21 18:09     ` Jörg Krause

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