iwn(4) driver showing poor performance, variable media selection on 10.0-BETA3

[R. Tyler Croy]

On Tue, 03 Dec 2013, Adrian Chadd wrote:

> What's the pci id string? Pciconf -lv

iwn0 at pci0:3:0:0:    class=0x028000 card=0x12118086 chip=0x42378086 rev=0x00 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'PRO/Wireless 5100 AGN [Shiloh] Network Connection'
    class      = network



> On Dec 2, 2013 11:48 PM, "R. Tyler Croy" <tyler at monkeypox.org> wrote:
> 
> > I recently installed FreeBSD 10.0-BETA3 onto my Thinkpad X200, everything
> > is
> > largely running fine except the wireless performance leaves a lot to be
> > desired.
> >
> > I've got an older Thinkpad T43 running -CURRENT next to the X200 in the
> > same
> > exact room, same distance from the AP, but with an iwi(4) card in it.
> >
> > The T43 will download large files between 100-200KB/s, and the "media"
> > mode for
> > wlan0 is "OFDM/48Mbps" which seems non-crazy.
> >
> > The X200 however will get between 20-90KB/s on the same files, and the
> > "media"
> > mode will oscillate *dramatically* during the transfer. I've watched it go
> > from
> > OFDM/54Mbps, down to 48Mbps, to 16Mbps, to DS/1Mbps which is where it
> > seems to
> > idle.
> >
> > I've started looking at the output of wlanstats(1) and nothing jumps out
> > at me,
> > then again, I'm a noob so what do I know:
> >
> >     [23:35:28] tyler:~ $ wlanstats
> >     8          rx frame too short
> >     30         rx from wrong bssid
> >     802156     rx discard 'cuz dup
> >     4          rx discard 'cuz mcast echo
> >     172272     rx beacon frames
> >     175177     rx element unknown
> >     996        rx frame chan mismatch
> >     61         rx seq# violation (TKIP)
> >     42         active scans started
> >     41         background scans started
> >     1072961    tkip crypto done in s/w
> >     405918     tkip tx MIC done in s/w
> >     667043     tkip rx MIC done in s/w
> >     173976     rx management frames
> >     667045     total data frames received
> >     663976     unicast data frames received
> >     3069       multicast data frames received
> >     406278     total data frames transmit
> >     405920     unicast data frames sent
> >     1M         current transmit rate
> >     22         current rssi
> >     -86        current noise floor (dBm)
> >     -64        current signal (dBm)
> >
> > The only thing that looks removely suspicious is the "rx discard" segment,
> > but
> > again, I plead noob.

- R. Tyler Croy
------------------
   Code: https://github.com/rtyler
Chatter: https://twitter.com/agentdero
         rtyler at jabber.org

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 196 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-wireless/attachments/20131203/96e28c14/attachment.sig>