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Re: [PATCH] ath9k: Reduce max roc duration

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On 15/10/14 3:59 am, "Sujith Manoharan" <sujith@xxxxxxxxxxx> wrote:

>MCC is currently used in CUS227, an Allplay
>device. Since audio streaming will be affected
>with long offchannel periods, reduce the max.
>offchannel duration to 200ms.
>diff --git a/drivers/net/wireless/ath/ath9k/init.c
>b/drivers/net/wireless/ath/ath9k/init.c
>@@ -789,7 +789,7 @@ static void ath9k_set_hw_capab(struct ath_softc *sc,
>struct ieee80211_hw *hw)
>-		hw->wiphy->max_remain_on_channel_duration = 10000;
>+		hw->wiphy->max_remain_on_channel_duration = 200;

This looks like a bad idea as the default value. Wouldn't this break a lot
of use cases where longer wait is needed? Please keep in mind that
remain-on-channel is used for non-P2P use cases as well and there are
known P2P devices that won't be able to reply in 200 ms to messages in
many cases. I would not reduce this value below 1000 ms and really, if
there is need to reduce remain-on-channel operations while there is a
concurrent connection, that should be done dynamically at runtime, e.g.,
in wpa_supplicant, rather than the driver hardcoding a very small maximum
value.

- Jouni

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