* A bug about multicast power save transmitting
@ 2015-07-13 14:18 Gyujin Lee
0 siblings, 0 replies; only message in thread
From: Gyujin Lee @ 2015-07-13 14:18 UTC (permalink / raw
To: linux-wireless
Hi all,
Firstly, I want to apologize for any mistakes I make this mail.
This is the first mail I have posted
My WiFi chipset:
Qualcomm Atheros AR9380/HB112
Device driver: ath9k (backports-4.1-rc1-1)
In power save multicast transmission, I want to increase the number of
transmitted multicast packets at a time.
So, I extend the max_duration of "ath_tx_cabq" function in the file
/drivers/net/wireless/ath/ath9k/xmit.c
void ath_tx_cabq{
...
line 2437 sc->cur_chan->beacon.dtim_period / ATH_BCBUF
=> sc->cur_chan->beacon.dtim_period
// Eliminate ATH_BCBUF
...
}
Then, multicast packets can be transmitted over one beacon interval.
(DTIM interval is not zero)
In this case, some of next multicast packets are transmitted before
next DTIM beacon.
(If multicast transmission ends in a beacon interval, all of next
multicast packets are transmitted after next DTIM beacon)
For example, if PHY rate for multicast transmission is 6Mb/s, 3
multicast packets are transmitted before DTIM beacon and other packets
are transmitted after DTIM beacon.
Is this phenomenon an error of this chipset?
Can I fix this error via modifying device driver?
Thank you.
Regards,
Gyujin Lee
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2015-07-13 14:18 A bug about multicast power save transmitting Gyujin Lee
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