Hi, I just told you what those fields are. Figure out:
* how they're used * the tx path queue code that uses them - figure out how it ends up programming D_RETRY_LIMIT * .. and which ones of those map to which fields inside D_RETRY_LIMIT. -a On 12 May 2014 09:49, Bhavesh Kamani <bhavesh.kam...@cyberoam.com> wrote: > Hi Adrian, > > Thanks a lot for the detailed info. I will try different combination in the > pointed function and observe it. > > Can you/someone help me what is the meaning of below macros? > > > #define INIT_SH_RETRY 10 > #define INIT_LG_RETRY 10 > #define INIT_SSH_RETRY 32 > #define INIT_SLG_RETRY 32 > > Setting value 2 for all these macros, increases the packet drop by > 2%(approximately) in lower signal strength(approx -80 db), if I set the > values to 64 then packet drop is very less. > > Thanks, > Bhavesh. > > > > On Monday 12 May 2014 10:00 PM, Adrian Chadd wrote: >> >> Hi, >> >> ath9k_11n_rate_series has "Tries". That's how many attempts at that >> given rate series entry. >> >> ar9002_set_txdesc() and ar9003_set_txdesc() (where the latter is >> relevant for you, using an ar9380) turn that rate series information >> into hardware specific information. >> >> ath_buf_set_rate() takes care of populating the bf->rates[] array, >> which is an array of ath9k_11n_rate_series entries. (Note - there's >> four of them. The hardware is limited to four.) >> >> Now, those fields in question behave slightly differently to what I >> think you expect: >> >> * Retry limits (D_RETRY_LIMIT) >> Offset: 0x1080 + (D << 2) >> >> 3:0 - Frame RTS failure limit. Specifies the number of times a >> frame's RTS exchange may fail before the current transmission >> series is terminated. (A frame's RTS exchange fails if RTS >> is >> enabled for the frame, but when the MAC sends the RTS on the >> air, no CTS is received.) Resets to 0x4. Note: A value of >> 0x0 >> is UNSUPPORTED. >> 7:4 - Reserved >> 13:8 - Station RTS failure limit. Specifies the number of times a >> frame's RTS exchange may fail before the CW is reset to >> CW_MIN. >> Resets to 0x20. Note: A value of 0x0 is UNSUPPORTED. >> 19:14 - Station data failure limit. Specifies the number of times a >> frame's data exchange may fail before CW is reset to CW_MIN. >> Resets to 0x20. Note: A value of 0x0 is UNSUPPORTED. >> 31:20 - Reserved >> >> .. so frame RTS controls the RTS failure count; I think the rate >> series tries is the total attempts made to transmit the frame assuming >> RTS succeeds, and station RTS/station data have to do with contention >> window management. >> >> Hope that helps, >> >> >> >> -a >> >> >> On 12 May 2014 08:49, Bhavesh Kamani <bhavesh.kam...@cyberoam.com> wrote: >>> >>> Hi Adrian, >>> >>> Can you please point me the exact file/function for rate schedule? >>> >>> But still I am not able to understand the usage of these macros. >>> >>> Thanks, >>> Bhavesh. >>> >>> >>> On Monday 12 May 2014 09:13 PM, Adrian Chadd wrote: >>>> >>>> There's also a maximum transmit retry counter in the rate schedule >>>> setup in the transmit descriptor. >>>> >>>> -a >>>> >>>> >>>> On 12 May 2014 07:59, Bhavesh Kamani <bhavesh.kam...@cyberoam.com> >>>> wrote: >>>>> >>>>> Hi Team, >>>>> >>>>> I am using this Ar9380 NIC as AP using hostapd 2.0. >>>>> >>>>> Thanks, >>>>> Bhavesh. >>>>> >>>>> On Monday 12 May 2014 08:26 PM, Bhavesh Kamani wrote: >>>>>> >>>>>> Hi Team, >>>>>> >>>>>> I have changed the values of following four macros and set it to 2 to >>>>>> change LongRetryLimit and ShortRetryLimit, but I am not able to see >>>>>> any difference. >>>>>> >>>>>> File : drivers/net/wireless/ath/ath9k/mac.h >>>>>> #define INIT_SH_RETRY 10 >>>>>> #define INIT_LG_RETRY 10 >>>>>> #define INIT_SSH_RETRY 32 >>>>>> #define INIT_SLG_RETRY 32 >>>>>> >>>>>> After setting value 2, I am able to see more than 2 retries when ACK >>>>>> is not sent by WiFi client for particular packet. >>>>>> Please let me know how to change LongRetryLimit and ShortRetryLimit. >>>>>> Is it the right place where I am changing the values? If yes, then >>>>>> what are the possible value ranges for LongRetryLimit and >>>>>> ShortRetryLimit? >>>>>> >>>>>> ath9k version : backports-3.12.8-1 >>>>>> Hardware : AR9380 miniPCIe >>>>>> >>>>>> Thanks, >>>>>> Bhavesh. >>>>> >>>>> _______________________________________________ >>>>> ath9k-devel mailing list >>>>> ath9k-devel@lists.ath9k.org >>>>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel >>> >>> > _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
