On Mon, May 26, 2014 at 1:39 AM, Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote: > On Mon, May 26, 2014 at 11:29 AM, Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote: >>>>>> >>>>>> Every now and then, my connection drops out. From wireshark on the >>>>>> station, it looks like traffic from the AP to the STA is coming >>>>>> through but traffic from the STA to the AP is not. I could be wrong >>>>>> here, though. Nothing is logged in either machine's kernel log. >>>>>> After 5 seconds to a couple minutes, everything starts working again. >>>>>> >>>>>> A couple of Apple devices using the same radio on the same AP seem to work fine. >>>>>> >>>>>> Any advice for debugging this? I don't know where to start. >>>>> >>>>> I caught one of the stalls with iwlwifi debugging on. I've attached >>>>> the dmesg. The stall ended ten seconds or so before the end of this >>>>> trace. Is this an indication that something's wrong with iwlwifi? >>>>> >>>>> [151258.096091] iwlwifi 0000:03:00.0: U iwlagn_good_plcp_health plcp health thre >>>>> shold 50 delta 96 msecs 103 >>>>> [151258.096095] iwlwifi 0000:03:00.0: U iwl_force_rf_reset perform radio reset. >>>>> >>>> Can you please disable powersave? >>>> It seems that it should be disabled by default, but you enabled it? >>>> I might be confused though... Looking again at the code... >>> >>> This? >>> >>> $ cat /sys/module/iwlwifi/parameters/power_save >>> N >>> >>> I have pcie_aspm.policy=powersave, but I don't think that should >>> matter. Or am I missing something? >> >> That should be ok. > > Does this help? > > diff --git a/drivers/net/wireless/iwlwifi/dvm/power.c > b/drivers/net/wireless/iwlwifi/dvm/power.c > index f2c1439..e5a6b70 100644 > --- a/drivers/net/wireless/iwlwifi/dvm/power.c > +++ b/drivers/net/wireless/iwlwifi/dvm/power.c > @@ -288,6 +288,9 @@ static void iwl_power_build_cmd(struct iwl_priv *priv, > bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS; > int dtimper; > > + iwl_power_sleep_cam_cmd(priv, cmd); > + return; > + > dtimper = priv->hw->conf.ps_dtim_period ?: 1; > > if (priv->wowlan) This patch has survived for about 15 minutes on 3.15-rc. It certainly has some effect: pinging from the AP to the STA now takes a consistent ~3.8ms instead of taking varying amounts of time between 5 and 200 ms or so. I wonder if this is something 802.11n/802.11ac-specific? I remember having all kinds of problems with 802.11n on this laptop that were resolved by turning off 11n or turning off power saving. -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
