Hi Jérôme, On Wed, 2017-05-24 at 07:33 -0400, Jérôme Carretero wrote: > 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'm experiencing low throughput with a BCM43362 wifi chip attached via SDIO to an i.MX28 [1,2]. After disabling some Kernel debug features I'm getting now a TCP throughput of 12.5 Mbps for the wifi interface, which is still below the throughput I get for the Cubietruck. > > 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. If you are in need for any testing I'm willing to help! [1] https://www.spinics.net/lists/linux-wireless/msg153257.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-October/ 461137.html Jörg
