Bug 831571 - Slow network (iwlwifi) after update to 3.4 kernel
Summary: Slow network (iwlwifi) after update to 3.4 kernel
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 17
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2012-06-13 10:43 UTC by Roman Kennke
Modified: 2012-06-23 21:35 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-06-15 20:05:46 UTC
Type: Bug

Attachments (Terms of Use)
Comment (150.99 KB, text/plain)
2012-06-15 09:04 UTC, Roman Kennke
no flags Details

Description Roman Kennke 2012-06-13 10:43:47 UTC
Description of problem:

After today's update of the kernel to 3.4, my network is superslow and times out regularily. I am using an Intel chip with iwlwifi (Lenovo T520 Thinkpad). Rebooting to older 3.3.x kernel works fine (therefore it's not my router/network/whatever). Please let me know what other info you need for diagnosing.

Version-Release number of selected component (if applicable):

How reproducible: Always

Steps to Reproduce:
1. Update to 3.4 kernel on computer with Intel chipset / iwlwifi
2. Connect to network using wifi
Actual results:

Browser pages load very slow, if at all (frequent timeouts), IRC, email, etc connection either very slow or timeouts.

Expected results:

Network should work fine.

Additional info: Please let me know what you need.

Comment 1 Roman Kennke 2012-06-13 10:44:28 UTC
Kernel version is 3.4.0-1.fc17.

Comment 2 Josh Boyer 2012-06-13 12:26:30 UTC
There are a couple of iwlwifi fixes committed in Fedora git.  You might try the scratch build Thorsten did in bug 825491


Unfortunately, upstream iwlwifi has been rather bug ridden for the past couple of releases.

Comment 3 Roman Kennke 2012-06-15 09:04:00 UTC
Created attachment 915462 [details]

(This comment was longer than 65,535 characters and has been moved to an attachment by Red Hat Bugzilla).

Comment 4 Roman Kennke 2012-06-15 20:05:46 UTC
Duh. I had wd_disable=1 set for iwlwifi module. Removing this fixes the problem.

Comment 5 moondrake 2012-06-23 21:35:29 UTC
I'd say this needs to be reopened: An update in a fedora kernel caused a significant regression. 

It has always worked without any major problems but after updating today to 3.4.2 I get things like:
[  951.609456] iwlwifi 0000:03:00.0: GF was set with SGI:SISO
(a million time until your disk is full, also makes connection slow, covered in bug Bug 832094)

and now suddenly:
[  351.882096] iwlwifi 0000:03:00.0: Queue 12 stuck for 2000 ms.
[  351.882103] iwlwifi 0000:03:00.0: Current SW read_ptr 135 write_ptr 192
[  351.882135] iwlwifi 0000:03:00.0: Current HW read_ptr 135 write_ptr 192
[  351.882139] iwlwifi 0000:03:00.0: On demand firmware reload
[  351.882550] ieee80211 phy0: Hardware restart was requested
[  351.882600] iwlwifi 0000:03:00.0: L1 Disabled; Enabling L0S

after wich the connection was completely unusable. I have never seen either problem before.

Unless the iwlwifi updates fixed a real problem, please at least consider reverting some of the recent patches.

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