Date: Fri, 9 Sep 2011 20:12:49 +0400 From: Lev Serebryakov <lev@serebryakov.spb.ru> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: AP performance (again): txpower regulation Message-ID: <1181080993.20110909201249@serebryakov.spb.ru> In-Reply-To: <CAJ-VmomOwpsmtoLqDO-=%2B_B_Ed0mnkuT%2BT5w5wuf2%2BLyjKmbAw@mail.gmail.com> References: <663133681.20110907193747@serebryakov.spb.ru> <CAJ-Vmonai4LzwanLw7i5d-NyjN2b6GqfttjkdcROvOuEcuzEAw@mail.gmail.com> <437702009.20110907235248@serebryakov.spb.ru> <CAJ-Vmo=R-a%2BqhDLWj1n%2BBj70Pmg4WSL6bVZ6jwCUmNq=v7EBBw@mail.gmail.com> <426917282.20110908125907@serebryakov.spb.ru> <CAAUsrB5Qtokpcz-koUfYWCHrsnUUErQSAYHrXrW2F0Uvp3RzSA@mail.gmail.com> <4610390305.20110908154130@serebryakov.spb.ru> <CAAUsrB6LJ%2BmuTvaqHCySh6e9dMjzshohYFE4PQ3KTezZMZS2JA@mail.gmail.com> <1705262661.20110908180850@serebryakov.spb.ru> <CAAUsrB7CFu096x%2BKKWa=8O_VeSHOK10LuwJ2rWq6r8EidUrL=Q@mail.gmail.com> <CAJ-VmokvXfUAZpxDgv5gLrRdLYn3YwTXAOb7QiTyUg8K5yKLHg@mail.gmail.com> <458771414.20110908183656@serebryakov.spb.ru> <CAJ-Vmom_ZHKbqt%2BQgmdq_oPU-SugbrJ3LNS=g-cpcQ7KExusUw@mail.gmail.com> <4910491962.20110908185213@serebryakov.spb.ru> <CAJ-Vmo==J_9ZhnSciVKNaEaMhM4oeM9fr4yjzPev_MW3g9DALg@mail.gmail.com> <1273865639.20110908191303@serebryakov.spb.ru> <1607911768.20110909113824@serebryakov.spb.ru> <CAJ-Vm okAvtKTUGo5zBS3ry0nRH=P%2B1TNB2n-9dKK%2BSWn6FdJ2A@mail.gmail.com> <140679489.20110909154614@serebryakov.spb.ru> <CAJ-VmomQQGgSf=R8A1bvF9s_FqWBaCCzwFjG5eaoWAOhjHKkiw@mail.gmail.com> <CAJ-VmonUioh4g3NScinYDU6gEFWDLeGKUYQfRyNoWr5%2BfjQeTw@mail.gmail.com> <192542574.20110909193326@serebryakov.spb.ru> <CAJ-VmomOwpsmtoLqDO-=%2B_B_Ed0mnkuT%2BT5w5wuf2%2BLyjKmbAw@mail.gmail.com>
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Hello, Adrian. You wrote 9 =F1=E5=ED=F2=FF=E1=F0=FF 2011 =E3., 19:37:57: > Look at all of those OFDM errors. That's a big, big part of your problem. Yep. I've been almost sure, that this is not normal to see such big numbers here. > It's possible that there's some problem with the driver code and it's > somehow setting up the RX side of your NIC incorrectly, causing lots > of those OFDM errors. > But it's also very likely you've just got a lot of noise in your local > environment. Interesting question, is it possible to measure noise without spending $100K on special hardware? And, is it possible, that cause of these errors is that card is broken? Overheated some time ago, for example -- case of my AP is not very well ventilated, unfortunately, it is Soekris net5501 in its standard case and it is very hot sometimes. > You could try disabling ANI (sysctl dev.ath.0.intmit=3D0) and see if > things behave better/worse. You won't get OFDM/CCK error counts > though, so don't assume "0" for those counts magically means they went > away. Stable 36M from athstat and 9-10Mbit UDP from client to server. Changing this sysctl back and forth doesn't affect bandwidth. BTW, it seems, that problems is (partially) with noise in environment -- speed vary from day to day... > Finally, if you/someone sends me one of those NICs, I can try using it > here and see how it behaves. :) It seems, they are discounted :( I could not find any in-stock. --=20 // Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>
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