Hi, We made retries configurable in our mac80211+ath9k system, and we ended with 3 counts: 1) short retry count, defaults to 4 2) long retrys count, defauts to 7 3) software retry count, defaults to 30 This last one is used separately for each frame in an aggregated frame, since they can be separately acknowledged. Regards, Jean-Pierre > -----Message d'origine----- > De : linux-wireless-owner@xxxxxxxxxxxxxxx [mailto:linux-wireless-owner@xxxxxxxxxxxxxxx] De la part de > Ben Greear > Envoyé : mardi 17 juillet 2018 17:08 > À : SEDE; Benjamin Beichler; ath10k; linux-wireless@xxxxxxxxxxxxxxx > Objet : Re: Setting tx retry count in ath10k > > > > On 07/17/2018 12:56 AM, SEDE wrote: > > Hi, > > > > In the standard, 7 is the default for the short retry count, 4 is well the default for long retry > count. > > > > In ath10k, there is also non_agg_sw_retry_th to control this, will this still be used? > > Or what is the difference with rc_num_retries? > > > > Kind regards, > > Sébastien. > > The ath10k firmware has no idea of long vs short retries, so I just used the > long setting. > > I will investigate that non_agg_sw_retry_th as well, and I did notice my wave-1 > firmware (at least) uses 15 retries for self-generated frames. But, in my case, > those self-gen frames are not much used anyway since I disable firmware keep-alive. > > And, I need to see how the mac80211 stack handles its own retries when working > with ath10k. > > Thanks, > Ben > > > > > > > On 2018-07-17 09:39, Benjamin Beichler wrote: > >> Hi, > >> > >> Am 17.07.2018 um 02:37 schrieb Ben Greear: > >>> I spent a bit of time looking into setting the tx retry count in > >>> ath10k (wave-1 firmware). The firmware has support for setting this as > >>> a vdev parameter, and it defaults to '2', at least in my wave-1 firmware. > >>> > >>> I enabled propagating the setting from mac80211, ie: > >>> iw phy wiphy0 set retry short 2 long 2 > >>> > >>> And while debugging this, I noticed that mac80211 has a default of > >>> 4, but the ath10k firmware has a default of 2. Now, I am not sure > >>> if I should enable setting the retry count since it will change > >>> the behaviour even if users don't set anything. > >>> > >> Maybe I'm wrong, but I have in mind, that 7 retries is the default > >> setting of mac80211. Although 2 or even 4 seems to be pretty low for the > >> overall retry count, so maybe the values are somehow changed in the > >> firmware? From our experiments we know (at least for 802.11n) you need > >> for normal operation a retry count of something between 5 - 9, but > >> sometimes also 12 or 15 is beneficial. > >> > >> We use for our experimental setup mainly ath9k cards and rt28xx nics, > >> and with them you need definitely more retries. > >> > >> Nonetheless, I don't think the change from 2 to 4 does really affect the > >> behavior in a negative way (if it works as expected). > >> > >>> Any opinions on this? > >>> > >>> Thanks, > >>> Ben > >>> > > > > -- > Ben Greear <greearb@xxxxxxxxxxxxxxx> > Candela Technologies Inc http://www.candelatech.com
