Hi Stefan, Unfortunately, it makes no difference. :-/
With bssid specified: 25 packets transmitted, 25 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 7.357/8.340/25.425/3.489 ms Without bssid specified: 25 packets transmitted, 20 packets received, 20.0% packet loss round-trip min/avg/max/std-dev = 7.344/16.816/118.988/25.672 ms When testing for longer periods, I still see some packet loss even with the bssid specified, but it's a lot worse without it specified and is timed with when the background scan starts. On Fri, May 25, 2018 at 07:47:26PM +0200, Stefan Sperling wrote: > On Sun, Apr 29, 2018 at 03:39:07AM +0200, Jesper Wallin wrote: > > Hi all, > > > > I recently learned that my AP behaves badly and I have packet loss when > > the background scan is running. > > Hi Jesper, > > Can you please check if this diff makes your AP work without > hardcoding its bssid? > > Index: if_iwm.c > =================================================================== > RCS file: /cvs/src/sys/dev/pci/if_iwm.c,v > retrieving revision 1.230 > diff -u -p -r1.230 if_iwm.c > --- if_iwm.c 23 May 2018 17:49:20 -0000 1.230 > +++ if_iwm.c 25 May 2018 17:32:41 -0000 > @@ -4719,7 +4719,7 @@ iwm_lmac_scan_fill_channels(struct iwm_s > chan->iter_count = htole16(1); > chan->iter_interval = 0; > chan->flags = htole32(IWM_UNIFIED_SCAN_CHANNEL_PARTIAL); > - if (n_ssids != 0 && !bgscan) > + if (n_ssids != 0) > chan->flags |= htole32(1 << 1); /* select SSID 0 */ > chan++; > nchan++; > @@ -4746,7 +4746,7 @@ iwm_umac_scan_fill_channels(struct iwm_s > chan->channel_num = ieee80211_mhz2ieee(c->ic_freq, 0); > chan->iter_count = 1; > chan->iter_interval = htole16(0); > - if (n_ssids != 0 && !bgscan) > + if (n_ssids != 0) > chan->flags = htole32(1 << 0); /* select SSID 0 */ > chan++; > nchan++; > @@ -4898,9 +4898,6 @@ iwm_lmac_scan(struct iwm_softc *sc, int > IWM_LMAC_SCAN_FLAG_EXTENDED_DWELL); > if (ic->ic_des_esslen == 0) > req->scan_flags |= htole32(IWM_LMAC_SCAN_FLAG_PASSIVE); > - else > - req->scan_flags |= > - htole32(IWM_LMAC_SCAN_FLAG_PRE_CONNECTION); > if (isset(sc->sc_enabled_capa, > IWM_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT)) > req->scan_flags |= htole32(IWM_LMAC_SCAN_FLAGS_RRM_ENABLED); > @@ -5098,8 +5095,6 @@ iwm_umac_scan(struct iwm_softc *sc, int > tail->direct_scan[0].len = ic->ic_des_esslen; > memcpy(tail->direct_scan[0].ssid, ic->ic_des_essid, > ic->ic_des_esslen); > - req->general_flags |= > - htole32(IWM_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT); > } else > req->general_flags |= htole32(IWM_UMAC_SCAN_GEN_FLAGS_PASSIVE); > >
