Re: rtl8187 rate control doesn't work

Re: rtl8187 rate control doesn't work

[Luis R. Rodriguez]

On Jan 5, 2008 9:47 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> Hi
>
> Now the compat-wireless-2.6 package is working and I get an Internet
> connection with my rtl8187 based card. (It's on an ASUS P5B Deluxe)
>
> I used the compat-wireless-2.6 package for this log, but I have the same
> problem with the version integrated in kernel 2.6.24-rc6
>
> The Access Point is some rooms away so the signal is not the best at my
> location. When starting the device with no fixed rate it wants to
> connect with 54MBit/s and as iwconfig says it was successful but I can't
> ping any device in the wireless LAN. (it's the first part of the log)
> The rate will not be slowed down it stays fixed at 54MBit/s.
>
> After starting the device with rate fixed to 11M I get a connection to
> the Access Point and iwconfig's output looks the same as without fixed
> rate, but I'm able to ping the all devices in the network. (second part
> of the log)
> Now it slows down the rate to 1MBit/s

Seems to be the new PID rate control algorithm. I believe Stephano
(CC'd) was sending some patches for this. Please try changing in
config.mk

>From this value:

CONFIG_MAC80211_RC_DEFAULT=pid

To this:

CONFIG_MAC80211_RC_DEFAULT=simple

and let us know how that goes. Oh and linux-kernel is the wrong list
to use, please just use linux-wireless for future e-mails.

  Luis

Re: rtl8187 rate control doesn't work

[Hauke Mehrtens]

There is an other Problem.

iwconfig shows me "Bit Rate=1 Mb/s" the hole time, but I'm able to
download with an average of 440K/s as wget says.

It's with PID rate control algorithm.

--

Hauke Mehrtens

Luis R. Rodriguez wrote:
> On Jan 5, 2008 9:47 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
>> Hi
>>
>> Now the compat-wireless-2.6 package is working and I get an Internet
>> connection with my rtl8187 based card. (It's on an ASUS P5B Deluxe)
>>
>> I used the compat-wireless-2.6 package for this log, but I have the same
>> problem with the version integrated in kernel 2.6.24-rc6
>>
>> The Access Point is some rooms away so the signal is not the best at my
>> location. When starting the device with no fixed rate it wants to
>> connect with 54MBit/s and as iwconfig says it was successful but I can't
>> ping any device in the wireless LAN. (it's the first part of the log)
>> The rate will not be slowed down it stays fixed at 54MBit/s.
>>
>> After starting the device with rate fixed to 11M I get a connection to
>> the Access Point and iwconfig's output looks the same as without fixed
>> rate, but I'm able to ping the all devices in the network. (second part
>> of the log)
>> Now it slows down the rate to 1MBit/s
> 
> Seems to be the new PID rate control algorithm. I believe Stephano
> (CC'd) was sending some patches for this. Please try changing in
> config.mk
> 
> From this value:
> 
> CONFIG_MAC80211_RC_DEFAULT=pid
> 
> To this:
> 
> CONFIG_MAC80211_RC_DEFAULT=simple
> 
> and let us know how that goes. Oh and linux-kernel is the wrong list
> to use, please just use linux-wireless for future e-mails.
> 
>   Luis

Re: rtl8187 rate control doesn't work

[Luis R. Rodriguez]

On Jan 7, 2008 11:02 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> There is an other Problem.
>
> iwconfig shows me "Bit Rate=1 Mb/s" the hole time, but I'm able to
> download with an average of 440K/s as wget says.
>
> It's with PID rate control algorithm.

Thanks for reporting this, how'd it go with simple rate control
algorithm instead?

  Luis

Re: rtl8187 rate control doesn't work

[Hauke Mehrtens]

Luis R. Rodriguez wrote:
> On Jan 7, 2008 11:02 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> 
> Thanks for reporting this, how'd it go with simple rate control
> algorithm instead?

How do I change from pid to simple rate control algorithm? I have tried
to set the CONFIG_MAC80211_RC_DEFAULT variable but it doesn't change the
 dmesg output. On kernel 2.6.22 simple rate control algorithm is used as
default but on 2.6.24 pid is the default on.

Can you please send me a config.mk

On kernel 2.4.24 with pid the rate shown by iwconfig stays at the
starting on, also if I change it with "sudo iwconfig wlan0 rate 11M", on
kernel 2.6.22 with simple rate control algorithm it shows the right rate.

If I change the rate to something smaller than 11M I am able to ping the
Access Point and if it is bigger that 11M I can't ping it. If no fixed
rate is entered it stays at 54MBit/s and I can't ping the AP. The
network speed is at ~1MBit/s and "Link Quality=53/64  Signal level=25/65"

I have a AMD64 System and I am using the compat-wireless-2.6 of today.

Hauke Mehrtens

Re: rtl8187 rate control doesn't work

[Hauke Mehrtens]

I have tested kernel 2.6.24-rc7-git4 with the build in rtl8187 module
and I have the same problem.

I can't ping the AP if the rate is set to auto or to something higher
than 11M. I have to set it to something less than 11M to be able to ping
the AP.

iwconfig shows a successful connection in both cases.

I am using Ubuntu 7.10 with vanilla kernel 2.6.24-rc7-git4 on AMD64
system with wpa_supplicant v0.5.8

--
Hauke

Re: rtl8187 rate control doesn't work

[Stefano Brivio]

On Sat, 12 Jan 2008 15:44:30 +0100
Hauke Mehrtens <hauke@hauke-m.de> wrote:

> I have tested kernel 2.6.24-rc7-git4 with the build in rtl8187 module
> and I have the same problem.

Could you please try the wireless-2.6 kernel tree? I think it's fixed
there. Details on how to download that can be found here:
http://linuxwireless.org/en/developers/Documentation/git-guide


--
Ciao
Stefano

Re: rtl8187 rate control doesn't work

[Hauke Mehrtens]

I have tried wireless-2.6 and I have the same problem. If the rate goes
over 11M no TCP/IP traffic goes through the wireless connecting. If rate
is set to auto and the rate control algorithm changes it to something
less than 11M TCP/IP traffic goes through, but if it is more than 11M no
TCP/IP traffic goes through the wireless link.

with "iwconfig wlan0 rate 11M" everything works.

--
Hauke Mehrtens

Stefano Brivio wrote:
> On Sat, 12 Jan 2008 15:44:30 +0100
> Hauke Mehrtens <hauke@hauke-m.de> wrote:
> 
>> I have tested kernel 2.6.24-rc7-git4 with the build in rtl8187 module
>> and I have the same problem.
> 
> Could you please try the wireless-2.6 kernel tree? I think it's fixed
> there. Details on how to download that can be found here:
> http://linuxwireless.org/en/developers/Documentation/git-guide
> 
> 
> --
> Ciao
> Stefano
> -
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: rtl8187 rate control doesn't work

[Stefano Brivio]

On Sat, 12 Jan 2008 19:23:53 +0100
Hauke Mehrtens <hauke@hauke-m.de> wrote:

> I have tried wireless-2.6 and I have the same problem. If the rate goes
> over 11M no TCP/IP traffic goes through the wireless connecting. If rate
> is set to auto and the rate control algorithm changes it to something
> less than 11M TCP/IP traffic goes through, but if it is more than 11M no
> TCP/IP traffic goes through the wireless link.

And this is a problem if the rate control algorithm often sets the rate to
more than 11M even if connection is unreliable at that rate. Does this
actually happen? Are you currently using 'pid'?

Also, it would be fine to have a dump of the PID events. In order to get
this, you need to:
- build a kernel with debugfs enabled;
- mount debugfs (mount -t debugfs foo /mnt/debug)

Then, before testing:
cat /mnt/debug/ieee80211/phy0/stations/*/rc_pid_events > events_dump

You can even make a graph out of that, with a python script which Mattias
posted on this list some time ago, but a dump would be just fine.


--
Ciao
Stefano

Re: rtl8187 rate control doesn't work

[Stefano Brivio]

[CC'ing rtl8187 maintainers again - please don't strip CC's off]

On Fri, 18 Jan 2008 21:19:03 +0100
Hauke Mehrtens <hauke@hauke-m.de> wrote:

> Stefano Brivio wrote:
> > Are you using an 802.11b only access point, or an access point configured
> > to support 802.11b only?
> 
> My Access Point is using 802.11g and 802.11b in mixed mode. With my
> notebook (b43 driver) I am getting a good connection to the Access Point.

Should I assume that this happens with the same kernel setup?

> If the Access Point is configured to support 802.11b only I have no
> problems with the rtl8187 card, because the card doesn't try to set the
> rate above 11M.

Then it looks like for some reason frames sent with rtl8187 using OFDM rates
silently fail, no errors are reported even if they aren't getting ACKed.
Andrea, Michael, any clue?


--
Ciao
Stefano

Re: rtl8187 rate control doesn't work

[Luis R. Rodriguez]

On Jan 11, 2008 5:39 PM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> Luis R. Rodriguez wrote:
> > On Jan 7, 2008 11:02 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> >
> > Thanks for reporting this, how'd it go with simple rate control
> > algorithm instead?
>
> How do I change from pid to simple rate control algorithm?

In config.mk replace this line:

CONFIG_MAC80211_RC_DEFAULT=pid

with:

CONFIG_MAC80211_RC_DEFAULT=simple

although I am planning on changing the config stuff soon.

  Luis