On Wed, Aug 20, 2014 at 5:55 PM, Adrian Chadd <adr...@freebsd.org> wrote: > On 20 August 2014 16:33, PseudoCylon <moonlightak...@yahoo.ca> wrote: >> On Wed, Aug 20, 2014 at 1:29 PM, Adrian Chadd <adr...@freebsd.org> wrote: >>> Are you seeing RX CRC errors for all rates? CCK? OFDM? HT? At all distances? >> >> CCK not sure, OFDM and HT yes. And at wide range of distances. (Tx >> rates usually hit mcs 12 to 14 with 2s ht20 ap) >> >>> >>> There's a handful of things we can look at to see what's causing it >>> once some more digging is done. >>> >>> (Eg, HT? could be guard interval. OFDM has similar issues, there's >>> typically ways to configure how much time between each symbol is left >>> before transmitting the next one. It may not be doing CTS-to-self, or >>> it may not be advertising the right thing via NAV, or it may be >>> ignoring CCK, or the receive gain tables are all messed up, etc.) >> >> I have looked into stuff I was able to dig out from other src codes, >> ie protection, ifs, nav, bk slot. (Because I do not have datasheet, >> every thing is based on my guesses.) One thing I could not figure out >> is if on-chip memory is properly allocated for rx pkt. (It seems >> memory can be allocated for different things, ie beacon, enc keys). >> > > So CRC errors are pretty normal with wifi. Even a tiny bit of > interference generates CRC errors. That's why there's an ACK and retry > mechanism. :P > > If you're hitting MCS 12 then you're doing pretty well. A-MPDU will > see lots of CRC errors just because of how long the transmissions are > and how easily corrupted things can get. That's again why there's a > quick retry mechanism for things.
To clarify, tx on run hits mcs 12 to 14. I assume tx on run is working. But, tx on ap can hit 39mbps at the best, most likely due to high rx crc error rates on run. > > What %age errors are you seeing? Constantly 70 to 80 rx crc errors/sec during active downloads. (h/w does not count total rx, so cannot tell the %.) > > > > > -a _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"