[ath9k-devel] Linksys WPC300N Wireless-N Notebook Adapter

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Mon, May 18, 2009 at 12:35:13PM -0700, hong zhang wrote:
> 
> 
> 
> --- On Mon, 5/18/09, Luis R. Rodriguez <lrodriguez@atheros.com> wrote:
> 
> > From: Luis R. Rodriguez <lrodriguez@atheros.com>
> > Subject: Re: [ath9k-devel] Linksys WPC300N Wireless-N Notebook Adapter
> > To: "hong zhang" <henryzhang62@yahoo.com>
> > Cc: "Luis Rodriguez" <Luis.Rodriguez@Atheros.com>, "Luis R. Rodriguez" <mcgrof@gmail.com>, "ath9k-devel at lists.ath9k.org" <ath9k-devel@lists.ath9k.org>, "Johannes Berg" <johannes@sipsolutions.net>
> > Date: Monday, May 18, 2009, 12:33 PM
> > On Mon, May 18, 2009 at 09:36:43AM
> > -0700, hong zhang wrote:
> > >
> > > Luis,
> > >
> > > 1. Does ath9k Tx/Rx buffer packets for power save
> > purpose?
> >
> > You mean in AP mode? If you are on a kernel >= 2.6.29
> > yes. That is
> > even if you are using compat-wireless you need at least
> > 2.6.29 still.
> >
> > > 2. Do TX power and signal level display go same path
> > to mac80211
> > >?   through rate control interface?
> >
> > I don't understand your question.
> >
> > > I think iw dev wlan0 station should
> > >?   display Tx power and signal level as
> > well.
> >
> > 'iw dev wlan0 station dump' does display signal. I get:
> >
> > mcgrof at tesla ~ $ iw dev wlan2 station dump
> > Station 00:0b:85:5b:8d:6c (on wlan2)
> >         inactive time:  22628 ms
> >         rx bytes:
> >    3042422
> >         rx packets:
> >    13165
> >         tx bytes:
> >    177786
> >         tx packets:
> >    947
> >         signal:
> >    -30 dBm
> >         tx bitrate:
> >    54.0 MBit/s
> >
> If signal -30dBm is Tx power on a channel, why the channel number is not displayed here?

That's seems reasoanble, patches are welcomed.

  Luis
> 
> 
> > Keep in mind wireless extensions added a 'quality' term
> > which
> > unfortunately was used differently between drivers. What we
> > add to
> > nl80211 should remain consistant accross drivers and it
> > should be
> > defined properly. If there is some enhancement to this
> > reporting which
> > you can think of please feel free to address this on
> > linux-wireless
> > with your recommendation. The next best thing we have to
> > report
> > signal would be through using the RCPI concept [1], but
> > note that it
> > specifically defines it as "the received RF power in the
> > channel measured
> > over the entire received frame or by other equivalent means
> > which meet the
> > specified accuracy". The last part is a little vague, that
> > of
> > "or by other equivalent means which meet the specified
> > accuracy" and
> > its questionable whether or not all devices support this.
> > Anyway
> > this could just be used by userspace and nl80211 should not
> > have to know
> > about this except maybe whether or not the device claims to
> > support
> > this accuracy terminology, I am also not sure what the
> > status of 802.11k
> > is which the group working on this, so it may be premature
> > to just add
> > it to nl80211/cfg80211.
> >
> > [1] http://www.spinics.net/lists/netdev/msg12028.html
> >
> > Patches are welcomed to add tx power displaying, not sure
> > why we didn't
> > add that.
> >
> >   Luis
> >
> > >
> > >
> > > ---henry
> > >
> > > --- On Mon, 5/18/09, Luis R. Rodriguez <lrodriguez@atheros.com>
> > wrote:
> > >
> > > > From: Luis R. Rodriguez <lrodriguez@atheros.com>
> > > > Subject: Re: [ath9k-devel] Linksys WPC300N
> > Wireless-N Notebook Adapter
> > > > To: "hong zhang" <henryzhang62@yahoo.com>
> > > > Cc: "Luis R. Rodriguez" <mcgrof@gmail.com>,
> > "ath9k-devel at lists.ath9k.org"
> > <ath9k-devel@lists.ath9k.org>
> > > > Date: Monday, May 18, 2009, 10:41 AM
> > > > On Sat, May 16, 2009 at 10:51:57PM
> > > > -0700, hong zhang wrote:
> > > > >
> > > > > Luis,
> > > > >
> > > > > Have you experience XJperf (windows graphic
> > version
> > > > iperf) to measure UDP/TCP throughput? I think it
> > does not
> > > > work properly because UDP throughput is always
> > 1Mbites/s.
> > > >
> > > > No, thanfully I don't have a windows box anywhere
> > near my
> > > > home or office,
> > > > that's just a serious security risk. But I see
> > xjperf runs
> > > > in Linux, I'll give
> > > > it a shot some time.
> > > >
> > > > > Also, does "iw dev ath0 station dump"
> > display bit rate
> > > > (I have not tested my WPC300N yet)?
> > > >
> > > > Right now ath9k does not report the proper 11n
> > rate, that
> > > > work needs a
> > > > decent rewrite on rate handling in ath9k. For now
> > please
> > > > use the ath9k
> > > > debugfs file, rcstat. That'll show you counters
> > for every
> > > > MCS rate.
> > > >
> > > >???Luis
> > > >
> > >
> > >
> > >
> >
> 
> 
>