Bug 699224 - ath9k: low throughput, disconnects
Summary: ath9k: low throughput, disconnects
Keywords:
Status: CLOSED DUPLICATE of bug 698978
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 15
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: John W. Linville
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-04-24 11:33 UTC by Stefan Assmann
Modified: 2011-05-02 18:47 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-05-02 18:47:10 UTC
Type: ---

Attachments (Terms of Use)
dmesg.txt (58.10 KB, text/plain)
2011-04-24 11:33 UTC, Stefan Assmann 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)


Links
System ID Private Priority Status Summary Last Updated
Linux Kernel 31452 0 None None None Never

Description Stefan Assmann 2011-04-24 11:33:36 UTC 
Created attachment 494512 [details]
dmesg.txt

Description of problem:
With F15 alpha and beta I see very low performance with my atheros wireless device. Throughput is often below 10kB/s and the network disconnects often.
Even if the netbook is placed right next to the AP.
After disabling power managment with "iwconfig wlan0 power off" things improved a little. Connection still gets reset every few minutes but average throughput is about 100kB/s now.

01:00.0 Network controller [0280]: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) [168c:002a] (rev 01)

Version-Release number of selected component (if applicable):
kernel-PAE-2.6.38.2-9.fc15.i686

How reproducible:
always
Comment 1 John W. Linville 2011-04-25 14:02:52 UTC 
Stefan, could you try the patch Hauke posted in the linked kernel.org bugzilla?
Comment 2 Stefan Assmann 2011-04-26 12:01:21 UTC 
John,
I tried the patch you mentioned and speeds are back to normal. :-)
However I noticed that once in a while transfer stalls for a moment and I found the following in dmesg
[  114.821716] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
[  114.821731] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  114.834213] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
Comment 3 Stefan Assmann 2011-05-02 12:17:38 UTC 
is the patch going to be included in F15?
Comment 4 John W. Linville 2011-05-02 14:25:20 UTC 
Just sent email asking for the corresponding commit to be added to stable series for 2.6.38.
Comment 5 John W. Linville 2011-05-02 18:47:10 UTC 

*** This bug has been marked as a duplicate of bug 698978 ***
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