Hi all,

For my current project, I need to send out response frames to a given type of data frames in the MadWifi driver as quick as possible.  I am doing it in the ath_rx_tasklet(...) function after knowing that I have received the wanted data frames and then sending out the customized response frames through a dedicated hardware queue.  However, I noticed that for IEEE 802.11a the inter frame space between the response and data frames is usually higher than 100 microseconds on my T43 laptop, but the gap between ACK and data frames is only around 12 microseconds. 

I know that ACK is generated in hardware to guarantee that the gap is SIFS and there may be some delay from the hardware to the driver for packet reception, depending on my system configuration.  Does anyone know how to reduce this delay?  I have disabled backoff and used DIFS = SIFS for the response frames.