Red Hat Bugzilla – Bug 447013
Taking iwlagn interface down slows down system for 1-2 seconds
Last modified: 2009-02-23 23:46:22 EST
Description of problem:
Taking the iwl4965 interface down (e.g., via NetworkManager or ifconfig wlan0
down) causes the system to become slow for a 1-2 seconds (mouse and screen
update very jerky, sound sticks).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Take wlan0 down.
System sluggish for a few seconds.
That this does not happen.
No ominous messages found in dmesg.
$ cat /proc/interrupts
0: 254 60 IO-APIC-edge timer
1: 4 8861 IO-APIC-edge i8042
8: 2 1 IO-APIC-edge rtc
9: 233 465474 IO-APIC-fasteoi acpi
12: 214259 67 IO-APIC-edge i8042
14: 13829 68661 IO-APIC-edge libata
15: 98012 44 IO-APIC-edge libata
17: 0 57472 IO-APIC-fasteoi uhci_hcd:usb3, sdhci:slot0,
18: 1801640 494 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 223975 3 IO-APIC-fasteoi uhci_hcd:usb6, firewire_ohci
20: 5772 1 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 305432 145 IO-APIC-fasteoi HDA Intel
216: 231627 339343 PCI-MSI-edge iwl4965
217: 2255 3146 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 18778974 18636674 Local timer interrupts
RES: 2333168 2505174 Rescheduling interrupts
CAL: 431 217 function call interrupts
TLB: 18156 17263 TLB shootdowns
TRM: 0 0 Thermal event interrupts
SPU: 0 0 Spurious interrupts
Still happens with kernel 188.8.131.52-60.fc8.
Still present in kernel-PAE-184.108.40.206-46.fc8.
Seen in x86-64 with kernel-220.127.116.11-79.fc9.x86_64.
Also in kernel-18.104.22.168-58.fc10.x86_64 from Rawhide.
Seen in kernel-22.214.171.124-30.fc9.x86_64, with iwlagn driver.
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Happens with 126.96.36.199-117.fc10.x86_64
This seems to be gathering some momentum upstream:
There a claim of a fix now in the above link.
Yes, unfortunately that patch does not apply cleanly to 2.6.27 or even 2.6.28-rc7. It will be a while before this is available in Fedora...
Could you try a Rawhide kernel? Is the problem resolved there?
The problem appears fixed in kernel-2.6.29-0.38.rc1.git4.fc11.x86_64. I've disabled wireless several times now without screen update interruption, sound skipping, or PS/2 port or ACPI EC timeouts.
John, is there any chance this will make it back into one of the more mature F10 kernel lines?
Most likely not until 2.6.29 is released...sorry. :-(