[rt2x00-users] [PATCH RFC] rt2800usb: TX_STA_FIFO read timer

Helmut Schaa helmut.schaa at googlemail.com
Tue Jan 11 03:00:09 EST 2011


Hi Johannes,

Am Montag, 10. Januar 2011 schrieb Johannes Stezenbach:
> as discussed some time ago my previous patch
> "rt2800usb: read TX_STA_FIFO asynchronously"
> (in rt2x00/experimental) makes it more likely
> for TX_STA_FIFO entries to be stuck in the FIFO until
> the watchdog picks them up, because the TX_STA_FIFO read
> is now happening quicker after TX DMA is done.

Nice. Did you do any performance measurements again?

> In theory it shouldn't take that long to send a packet but the
> debug output suggests otherwise so I picked 10ms for the timeout.
> I guess there is a lot of traffic from other APs in the neighbourhood
> on the same channel.

It can easily take >= 10ms, depending on the channel utilization and,
number of retries etc.

IMHO 10ms is a safe value.

Nice work,
Helmut



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