[Make-wifi-fast] tcp_pacing_rate_shift and smaller txops
bkil.hu+Aq at gmail.com
Mon Jul 2 16:12:05 EDT 2018
Interesting observation. Do you think the new wmm rules could prevent
fine tuning of these constants later on?
On Mon, Jul 2, 2018 at 9:44 PM, Dave Taht <dave.taht at gmail.com> wrote:
> wifi APs have the ability to advertise in the beacon, the actual
> maximum time of a txop for clients, and 802.11n, for example, cannot
> queue an aggregate in the VO queue. the otherwise lovely
> tcp_pacing_rate shift thing sets this to a fixed 4ms, when perhaps it
> could leverage the actual setting for the queue in question, at least,
> as defined by the beacon or 802.11e standard.
> I've long thought that perhaps a gaming wifi router would advertise
> smaller txops, and for all I know, some do.
> this is currently controlled by cwmin and cwmax parameters in hostapd
> # Best effort
> I did a lot of fiddling with this (lowering it to 1,1.5,2ms,3ms,4ms)
> at one point (that I cannot currently find). It hurt bandwidth but
> helped latency, a lot, and this was from before we shipped fq_codel
> for wifi.
> Dave Täht
> CEO, TekLibre, LLC
> Tel: 1-669-226-2619
> Make-wifi-fast mailing list
> Make-wifi-fast at lists.bufferbloat.net
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