On Fri, 2007-06-01 at 11:14 -0500, Larry Finger wrote: > /* TODO: what is a good starting rate for STA? About middle? Maybe not > * the lowest or the highest rate.. Could consider using RSSI from > * previous packets? Need to have IEEE 802.1X auth succeed immediately > * after assoc.. */ > > After that the code goes on to set the rate equal to the last one in the rate table, which might be > the highest rate. Yeah, I think that's very wrong. > Although that rate might be OK for most of the devices using mac80211, Even then, if the AP is just in range it might not receive transmissions at 54M, depending on the fallback mechanism that might or might not be ok. > it > certainly is not for bcm43xx, which does not have the ability to transmit or receive at speeds much > above 1 Mbs. In a private patch circulated only on the bcm43xx mailing list, I changed this routine > to set an initial rate of 1 Mbs, which certainly helps bcm43xx authenticate and communicate with the > DHCP server. The thing about 802.1X is that you have a handshake with a few packets that need to go through or you need to restart, which is the wpa problem people are seeing currently with bcm43xx, but my brother also sees with madwifi/atheros in our living room upstairs (router is downstairs here) > If this low rate were to be set for all drivers, how rapidly would the rate-control algorithm > respond? Would this cause a serious performance degradation? This, unfortunately, I don't know. I'd think the algorithm would adjust fast enough for it not to be an issue. johannes
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