Date: Tue, 9 Aug 2011 18:14:19 +0800 From: Adrian Chadd <adrian@freebsd.org> To: Lev Serebryakov <lev@serebryakov.spb.ru> Cc: freebsd-wireless@freebsd.org Subject: Re: Bad host-vased AP performace -- and qouple of questions about FreeBSD WiFi stack tuning Message-ID: <CAJ-Vmom-VdzRpS0S7c8z3rH5tYkbk1Nadw-=R6r65OX-_AOX1A@mail.gmail.com> In-Reply-To: <7764247.20110809135323@serebryakov.spb.ru> References: <1151152206.20110808220720@serebryakov.spb.ru> <201108090829.18712.bschmidt@freebsd.org> <1681554189.20110809132747@serebryakov.spb.ru> <CAJ-VmokAuF6rmN=x1oTE5jksrbf2Psew7-4Qb%2BWd-=kZS1svaQ@mail.gmail.com> <7764247.20110809135323@serebryakov.spb.ru>
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txpower 15 is actually 15dBm. Ie, try "ifconfig wlan0 txpower 1.5" :-) Adrian 2011/8/9 Lev Serebryakov <lev@serebryakov.spb.ru>: > Hello, Adrian. > You wrote 9 =C1=D7=C7=D5=D3=D4=C1 2011 =C7., 13:35:52: > >> There's a dBm to mW chart. > =9AYou've forgot link or attache? > > =9A =9AI'm looking at: > =9Ahttp://en.wikipedia.org/wiki/DBm > > =9AAnd according to this table my "30" is 1W, which is not believable > (too high). Datasheet says "21.5dBm at 54Mbit", which means ~140mW, > which is in contradiction with "600mW" from same datasheet (or 400mW, > according to other, as I'm not sure about exact version of my card -- > it has protection shield from one version and additional power header > from other). > > =9AAnd "15" for iwn card is 32mW, which is not believable (too > low). > >> Don't forget antenna gain. > =9A9dBm or 10dBm in my case, oh my. So, result is ~30+10 =3D 40dBm =3D 10= W?! I don't > =9Aunderstand something here! > > -- > // Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru> > >
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