Bug 755213

Summary:	iwl4965 offers bad performance and connection hangs/high ping
Product:	[Fedora] Fedora	Reporter:	Michel Bouwmans <mfb.chikazuku>
Component:	kernel	Assignee:	Stanislaw Gruszka <sgruszka>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	16	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-07-13 13:06:13 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Michel Bouwmans 2011-11-19 15:14:47 UTC

User-Agent:       Opera/9.80 (X11; Linux x86_64; U; en) Presto/2.9.168 Version/11.52

My laptop has the following WiFi-card, which uses the iwl4965-driver:

Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

Since upgrading to Fedora from Ubuntu, which used the iwlagn-driver, the quality of my WiFi connection has been very bad.

I mostly experience problems making TCP/IP-connections and bad performance with 11n disabled and occasional high ping and packet loss added when 11n is enabled.

Reproducible: Always

Steps to Reproduce:
1. Try to use the network with the iwl4965-driver out of the box
Actual Results:  
Bad performance, problems making TCP/IP-connections, occasional high ping and packet loss

Expected Results:  
Good performance, no problems with connections or ping and no packet loss

There are some messages continuously coming up in dmesg in 11n-mode, no messages with 11n_disable=1. Some snippets:

iwl4965 0000:04:00.0: iwl4965_tx_agg_start on ra = e0:69:95:98:88:34 tid = 0

iwl4965 0000:04:00.0: Aggregation not enabled for tid 0 because load = 0

Also happening with tid 2, but much less frequently.

Comment 1 Stanislaw Gruszka 2011-11-22 07:53:07 UTC

Which kernel version was on ubuntu? There are lots of regressions on iwl4965, introduced between 2.6.38 and 2.6.39, where Intel split driver between iwlwifi and iwlegacy. I'm trying to fix them but it take time.
If you used ubuntu with 2.6.38 kernel or older, that would be regression I mension. If ubuntu has newer kernel, that mean the bug is caused by different behaviour of user space i.e. NetworkManager.

Comment 2 Michel Bouwmans 2011-11-22 10:50:58 UTC

I used 2.6.37 vanilla with the iwlagn-driver. So yeah, that must have been before the split is I now use the iwl4965-driver.

Comment 3 Dave Jones 2012-03-22 16:36:56 UTC

[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 4 Dave Jones 2012-03-22 16:42:04 UTC

[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 5 Dave Jones 2012-03-22 16:50:17 UTC

[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 6 Stanislaw Gruszka 2012-07-13 13:06:13 UTC

If this still happen on 3.4 or never please reopen that bug, I'm closing it.