From: Felix Fietkau <nbd@openwrt.org>
To: Jouni Malinen <j@w1.fi>
Cc: "Gábor Stefanik" <netrolller.3d@gmail.com>,
"John Linville" <linville@tuxdriver.com>,
linux-wireless <linux-wireless@vger.kernel.org>,
"Johannes Berg" <johannes@sipsolutions.net>,
"Zhu Yi" <yi.zhu@intel.com>, "Tomas Winkler" <tomasw@gmail.com>,
"Tomas Winkler" <tomas.winkler@intel.com>,
"Nick Kossifidis" <mickflemm@gmail.com>,
"Luis R. Rodriguez" <lrodriguez@atheros.com>,
"Luis R. Rodriguez" <mcgrof@gmail.com>
Subject: Re: [PATCH 0/5] mac80211, iwlwifi, ath9k: Fix rate scaling for IEEE80211_TX_CTL_NO_ACK packets
Date: Fri, 24 Apr 2009 19:31:53 +0200 [thread overview]
Message-ID: <49F1F789.6090307@openwrt.org> (raw)
In-Reply-To: <20090423180928.GA22426@jm.kir.nu>
Jouni Malinen wrote:
> On Thu, Apr 23, 2009 at 07:35:55PM +0200, G=C3=A1bor Stefanik wrote:
>> Handling of multicast/NO_ACK packets by mac80211 rate scaling is a
>> mess. Basically, the rule of thumb is that any packet with
>> IEEE80211_TX_CTL_NO_ACK (including multicasts and broadcasts, which
>> always have this flag set) should be sent at lowest rate (unless
>> overridden by radiotap - this is not covered in this patchset), with
>> no retries.
>=20
> While this may be the case with the current rate control
> implementations, this is not a good assumption to make.
> Multicast/broadcast frames could (and often really should) be
> transmitted at higher rate, i.e., the rate control algorithm could
> figure out that all associated STAs should be able to receive frames =
at
> a higher basic rate.
Good idea. I should implement this in minstrel and use the minimum valu=
e
of max_prob_rate for all stations as multicast rate ;)
Johannes: Can you think of a good way to fit this into the API?
- Felix
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next prev parent reply other threads:[~2009-04-24 17:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 17:35 [PATCH 0/5] mac80211, iwlwifi, ath9k: Fix rate scaling for IEEE80211_TX_CTL_NO_ACK packets Gábor Stefanik
2009-04-23 18:09 ` Jouni Malinen
2009-04-23 18:18 ` Gábor Stefanik
2009-04-24 17:31 ` Felix Fietkau [this message]
2009-04-25 7:12 ` Johannes Berg
2009-04-28 20:53 ` Gábor Stefanik
2009-04-30 18:28 ` John W. Linville
2009-04-30 19:02 ` John W. Linville
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