SmallNetBuilder Forums
Go Back   SmallNetBuilder Forums > Wireless Networking > ASUS Wireless > ASUS N Routers & Adapters

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 11-26-2012, 11:09 AM
reza.kashef reza.kashef is offline
New Member
 
Join Date: Nov 2012
Posts: 7
Thanks: 0
Thanked 1 Time in 1 Post
reza.kashef is just starting out
Default Can you see this entry in your log file?

kernel: COEX: downgraded chanspec 0x2d04 to 0x2b02: channel x used by exiting BSSs

Hi

As the topic implies, can you see the entry in your log file?
I cant find it in the FW source code, so if someone knows EXACTLY what this is please inform me!

Thanks in advance!
Reply With Quote
  #2  
Old 11-26-2012, 01:39 PM
RMerlin's Avatar
RMerlin RMerlin is offline
Very Senior Member
 
Join Date: Apr 2012
Location: Canada
Posts: 12,168
Thanks: 66
Thanked 6,943 Times in 2,817 Posts
RMerlin is just starting out
Default

It's the wireless driver simply adapting itself to the presence of other networks causing interference with it. This is just a normal notice, it doesn't indicate any real problem.
__________________
Asuswrt-Merlin: Customized firmware for Asus routers
Github: github.com/RMerl - Twitter: RMerlinDev
See the sticky post for more info.
Reply With Quote
  #3  
Old 11-26-2012, 02:54 PM
KevTech KevTech is offline
Very Senior Member
 
Join Date: Feb 2012
Location: United States
Posts: 350
Thanks: 2
Thanked 56 Times in 46 Posts
KevTech is just starting out
Default

I believe it is the wireless downgrading from 40 to 20MHz.
Reply With Quote
  #4  
Old 11-27-2012, 04:21 AM
reza.kashef reza.kashef is offline
New Member
 
Join Date: Nov 2012
Posts: 7
Thanks: 0
Thanked 1 Time in 1 Post
reza.kashef is just starting out
Default

Thank you.

RMerlin: It is the ”adapting” part I’m interested in.

This has nothing to do with “downgrading” from 40 to 20MHz, neither with changing of the channel in auto mode.

I have 2 routers operating in the same neighborhood (roughly the same interference), one with FW .220 and the other with .260.
In the log file for the .220 router I see the entry all the times but never in the one running .260.
Reply With Quote
  #5  
Old 11-27-2012, 11:09 AM
RMerlin's Avatar
RMerlin RMerlin is offline
Very Senior Member
 
Join Date: Apr 2012
Location: Canada
Posts: 12,168
Thanks: 66
Thanked 6,943 Times in 2,817 Posts
RMerlin is just starting out
Default

Quote:
Originally Posted by reza.kashef View Post
Thank you.

RMerlin: It is the ”adapting” part I’m interested in.

This has nothing to do with “downgrading” from 40 to 20MHz, neither with changing of the channel in auto mode.

I have 2 routers operating in the same neighborhood (roughly the same interference), one with FW .220 and the other with .260.
In the log file for the .220 router I see the entry all the times but never in the one running .260.
Asus has been experimenting with ways to make the router more stable under high interference environments. They added a new option to manually trigger that behaviour while they look deeper into the root issue - that's what the Enhanced Interference Management option under Wireless -> Professional will toggle how the router react if there's too much radio interference.

I'm not sure if that downgrade is related to the channel width or to switching to a different channel. If you have your router set to "Auto" for the channel selection, then that might be what you are seeing in the log - a switch to a less crowded channel. Unfortunately, I don't know enough about the lowlevels of the wireless driver itself to know for sure.
__________________
Asuswrt-Merlin: Customized firmware for Asus routers
Github: github.com/RMerl - Twitter: RMerlinDev
See the sticky post for more info.
Reply With Quote
  #6  
Old 11-28-2012, 04:15 AM
reza.kashef reza.kashef is offline
New Member
 
Join Date: Nov 2012
Posts: 7
Thanks: 0
Thanked 1 Time in 1 Post
reza.kashef is just starting out
Default

Thanks RMerlin

Yes, I also suspected that this might have something to do with the "Enhanced Interference Management" (wl interferance).

As I mentioned before the log entry has nothing to do with a channel or bandwidth change, I think that the driver calls the fw about the interference and at the same time logs this.
I have found the string in an object file but nothing in the fw source.

Is it right that the "Enhanced Interference Management" option, when enabled sets interference = 4 and when disabled sets it to 0?

Oh, by the way, do you know if and where the wl interference equivalent value is stored in nvram?

Last edited by reza.kashef; 11-28-2012 at 05:55 AM. Reason: Add a question
Reply With Quote
  #7  
Old 11-28-2012, 11:05 AM
RMerlin's Avatar
RMerlin RMerlin is offline
Very Senior Member
 
Join Date: Apr 2012
Location: Canada
Posts: 12,168
Thanks: 66
Thanked 6,943 Times in 2,817 Posts
RMerlin is just starting out
Default

Quote:
Originally Posted by reza.kashef View Post

As I mentioned before the log entry has nothing to do with a channel or bandwidth change, I think that the driver calls the fw about the interference and at the same time logs this.
I have found the string in an object file but nothing in the fw source.
The driver is closed source. Fairly sure that this message comes from the wireless driver itself and not from the firmware.

Quote:
Originally Posted by reza.kashef View Post
Is it right that the "Enhanced Interference Management" option, when enabled sets interference = 4 and when disabled sets it to 0?
That's correct.

Quote:
Originally Posted by reza.kashef View Post
Oh, by the way, do you know if and where the wl interference equivalent value is stored in nvram?
The value itself isn't stored in nvram, only the state of that option you mentioned. The nvram setting wl_noisereduction will be set to 0 or 1.
__________________
Asuswrt-Merlin: Customized firmware for Asus routers
Github: github.com/RMerl - Twitter: RMerlinDev
See the sticky post for more info.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 09:07 AM.


Top 10 Stats
Top Posters* Top Thanked
RMerlin  529
john9527  189
System Error...  167
huotg01  166
stevech  149
L&LD  142
jegesq  131
azazel1024  89
hggomes  88
RussellInCinc...  71
RMerlin  6942
john9527  664
stevech  375
ryzhov_al  311
L&LD  275
TeHashX  271
RogerSC  211
hggomes  174
sinshiva  156
sfx2000  145
Most Viewed Threads* Hottest Threads*
Old Asuswrt-Merli...  43263
Old SECURITY:...  18651
Old ASUS...  10887
Old ASUS...  8076
Old Asus...  4102
Old choose a new...  3445
Old Bulding...  2329
Old Horrible...  2149
Old What is dual...  1846
Old Upgraded to...  1789
Old Asuswrt-Merli...  336
Old Asus...  95
Old SECURITY:...  74
Old choose a new...  73
Old ASUS...  59
Old What is dual...  44
Old ASUS...  43
Old Can you help...  40
Old How to build...  32
Old Using a UPS...  30


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
© 2006-2015 Pudai LLC All Rights Reserved.