Month: September 2007

Categories
everything else hopkinsville

Flakey Wireless + NFS != Good

Why would a flakey wireless connection cause login problems for a specific tty without affecting others? Why would the wireless connection affect local logins at all? These and many other questions may never be answered but at least the problems have a solution. If login problems weren’t enough the NFS mounts I had were causing hangs during shutdown.

My wireless is still not quite fixed. The underlying problem is that Wifi has suddenly gotten very crowded near my house. Even better, even though I have numerous networks causing interference for me none of them are close enough where i can leach off of them! :)

Categories
everything else

Followup on 2.6.23 idle wakeups

Well, I figured out that uhci_hcd was the culprit for the previous wakeups. uhci_hcd provides USB 1.1 support, which I can disable because my laptop is all USB v2. As you can see below the menu governor for 2.6.23-rc5 + hrt patch doesn’t work quite as well versus 2.6.23-rc4 + hrt patch because the CPU stays in C2 60% of time with the Wifi turned on. lspci output just for kicks.

PowerTOP 1.8 (C) 2007 Intel Corporation Collecting data for 15 seconds
Cn Avg residency
C0 (cpu running) ( 0.8%)
C1 0.0ms ( 0.0%)
C2 49.1ms (66.5%)
C3 0.7ms ( 0.0%)
C4 22.3ms (32.7%)
P-states (frequencies)
1.87 Ghz 0.0%
1.60 Ghz 0.0%
1333 Mhz 0.0%
800 Mhz 100.0%
Wakeups-from-idle per second : 28.5 interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
39.3% ( 10.1) <interrupt> : ipw2200, lan0
14.8% ( 3.8) <interrupt> : acpi
9.6% ( 2.5) gkrellm2 : schedule_timeout (process_timeout)
7.8% ( 2.0) xfce-mcs-manage : schedule_timeout (process_timeout)
7.0% ( 1.8) X : do_setitimer (it_real_fn)
5.5% ( 1.4) wpa_supplicant : schedule_timeout (process_timeout)
2.1% ( 0.5) wpa_cli : schedule_timeout (process_timeout)
2.1% ( 0.5) slim : do_setitimer (it_real_fn)
1.8% ( 0.5) events/0 : ipw_gather_stats (delayed_work_timer_fn)
1.6% ( 0.4) <interrupt> : ide0
1.0% ( 0.3) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer)
0.8% ( 0.2) ifplugd : schedule_timeout (process_timeout)
0.8% ( 0.2) init : schedule_timeout (process_timeout)
0.8% ( 0.2) <kernel core> : page_writeback_init (wb_timer_fn)
0.5% ( 0.1) gaim : schedule_timeout (process_timeout)
0.5% ( 0.1) ssh-agent : schedule_timeout (process_timeout)
0.5% ( 0.1) cupsd : schedule_timeout (process_timeout)
0.3% ( 0.1) <interrupt> : PS/2 keyboard/mouse/touchpad
0.3% ( 0.1) gaim : sk_reset_timer (tcp_write_timer)
0.3% ( 0.1) <kernel core> : ipw_net_hard_start_xmit (delayed_work_timer_fn)
0.3% ( 0.1) cifsdnotifyd : schedule_timeout (process_timeout)
0.3% ( 0.1) <kernel core> : init_nonfatal_mce_checker (delayed_work_timer_fn)
0.3% ( 0.1) bash : start_this_handle (commit_timeout)
0.3% ( 0.1) xfdesktop : schedule_timeout (process_timeout)
0.3% ( 0.1) xfce4-menu-plug : schedule_timeout (process_timeout)
0.3% ( 0.1) <kernel core> : end_that_request_last (laptop_timer_fn)
0.3% ( 0.1) pdflush : schedule_timeout (process_timeout)
0.3% ( 0.1) <kernel core> : neigh_update (neigh_timer_handler)
0.3% ( 0.1) <kernel core> : init_sunrpc (delayed_work_timer_fn)
0.3% ( 0.1) cifsoplockd : schedule_timeout (process_timeout)

Categories
everything else

SimpleShare Weirdness

Several days ago my SimpleShare desktop NAS stopped responding via NFS. Access to the web interface was still functional with no errors, a cursory disk check found no problems, rebooting the drive didn’t fix it. However, attempting to mount the drive over CIFS (samba) worked. After that NFS access worked again, for whatever reason. For other unknown reasons, fixing this problem also fixed an annoying hang on shutdown that happened at the “Unmounting all filesystems” step. How a problem with a NFS share could cause this I don’t know.