Bug 451701

Summary:	Poor bit rate with rt61pci based wlan card
Product:	[Fedora] Fedora	Reporter:	Mats Ljunggren <mats.ljunggren>
Component:	kernel	Assignee:	John W. Linville <linville>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	9	CC:	kernel-maint
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	2.6.25.10-86.fc9.x86_64	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-07-28 15:05:56 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mats Ljunggren 2008-06-16 18:59:50 UTC

Description of problem:
I get very poor bit rate between my RaLink RT2561/RT61 rev B 802.11g wlan card and wlan router 
(only about 4 meters between them). With kernel 2.6.25.6-55.fc9.x86_64 I only get a bit rate of 2 
Mb/s. With previous kernels (e.g. 2.6.25.4-30.fc9.x86_64) I get 54 Mb/s.

Version-Release number of selected component (if applicable):
kernel-2.6.25.6-55.fc9.x86_64

How reproducible:
Always

Steps to Reproduce:
1.
2.
3.
  
Actual results:
Bit rate of only 2 Mb/s

Expected results:
Higher bit rate, mostly 54 Mb/s

Additional info:
dmesg output:
ADDRCONF(NETDEV_UP): wlan0: link is not ready
wlan0: Initial auth_alg=0
wlan0: authenticate with AP 00:19:5b:e5:2e:f0
wlan0: RX authentication from 00:19:5b:e5:2e:f0 (alg=0 transaction=2 status=0)
wlan0: authenticated
wlan0: associate with AP 00:19:5b:e5:2e:f0
wlan0: authentication frame received from 00:19:5b:e5:2e:f0, but not in authenti
cate state - ignored
wlan0: RX AssocResp from 00:19:5b:e5:2e:f0 (capab=0x421 status=0 aid=2)
wlan0: associated
wlan0: switched to short barker preamble (BSSID=00:19:5b:e5:2e:f0)
ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
wlan0: Initial auth_alg=0
wlan0: authenticate with AP 00:0f:66:c7:a4:ef
wlan0: RX authentication from 00:0f:66:c7:a4:ef (alg=0 transaction=2 status=0)
wlan0: authenticated
wlan0: associate with AP 00:0f:66:c7:a4:ef
wlan0: RX AssocResp from 00:0f:66:c7:a4:ef (capab=0x411 status=0 aid=1)
wlan0: associated
wlan0: switched to long barker preamble (BSSID=00:0f:66:c7:a4:ef)
wlan0: No ProbeResp from current AP 00:0f:66:c7:a4:ef - assume out of range
wlan0: Initial auth_alg=0
wlan0: authenticate with AP 00:0f:66:c7:a4:ef
wlan0: Initial auth_alg=0
wlan0: authenticate with AP 00:0f:66:c7:a4:ef
wlan0: RX authentication from 00:0f:66:c7:a4:ef (alg=0 transaction=2 status=0)
wlan0: authenticated
wlan0: associate with AP 00:0f:66:c7:a4:ef
wlan0: authentication frame received from 00:0f:66:c7:a4:ef, but not in authenti
cate state - ignored
wlan0: RX ReassocResp from 00:0f:66:c7:a4:ef (capab=0x411 status=0 aid=1)
wlan0: associated

Comment 1 Mats Ljunggren 2008-07-22 15:26:05 UTC

With kernel 2.6.25.10-86.fc9.x86_64 the problem is gone. Bit rate is back at 54 Mb/s again.

Comment 2 John W. Linville 2008-07-28 15:05:56 UTC

Thanks for the report!