Hi,
I just installed vdr 1.6.0 on Debian stable (Lenny). I run it on an old
notebook (Dell 1300, 1.5 GHz Celeron M).
Up until now the system was a network storage for some windows clients and a
music player for my living room. Now I plan to use vdr as a remote
controled VCR.
To keep it quiet I checked with powertop and got rid of most software that does
short idle loops. Now the system shows less than 10 wakeups per second from
sleep.
That is with dvb_usb_af9015 loaded but with "remote=0" module parameter
to disable the remote control input that aparently is done by polling.
(With "remote=2" it goes up by about 50 wakeups per second. OK, AFAIK USB
input devices need to be polled. No way around it. But does it have to be
at 20ms intervals?)
Anyway, the real fun comes with starting vdr. With vdr runing I get a
whopping 2700 wakeups per second! And thats doing nothing at all. No recording,
no playback no streaming. Nada! The result is a 30% CPU load (admittetly at a
low P-state) and a constantly runing CPU fan.
I don't know what vdr does, but it causes the device to jump through a lot of
(idle) loops. At least thats what I'd read from the output of powertop.
Does anybody have an idea as to what it causing this?
Any comparative data for other devices?
I also own a "Fujitsu-Siemens DVB-T Mobile TV Tuner" and I'll
take a look and try to find out if that device will generate
less system load.
Cheers
-henrik
Here's the idle state without vdr:
=================================
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 0.2%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.0ms ( 0.0%) 188 Mhz 100.0%
C3 102.8ms (99.8%)
Wakeups-from-idle per second : 9.7 interval: 20.0s
no ACPI power usage estimate available
Top causes for wakeups:
38.1% ( 4.9) <interrupt> : uhci_hcd:usb3, eth0
15.6% ( 2.0) xfsaild : schedule_timeout (process_timeout)
13.2% ( 1.7) xfsbufd : schedule_timeout (process_timeout)
7.8% ( 1.0) ifconfig : b44_open (b44_timer)
5.1% ( 0.7) <kernel core> : sk_reset_timer (tcp_delack_timer)
5.1% ( 0.7) mpd : sk_reset_timer (tcp_write_timer)
3.9% ( 0.5) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn)
1.9% ( 0.2) <kernel module> : neigh_table_init_no_netlink (neigh_periodic_timer)
1.9% ( 0.2) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer)
1.6% ( 0.2) runsvdir : schedule_timeout (process_timeout)
1.6% ( 0.2) <kernel core> : __netdev_watchdog_up (dev_watchdog)
1.6% ( 0.2) init : schedule_timeout (process_timeout)
0.8% ( 0.1) screen : do_setitimer (it_real_fn)
0.8% ( 0.1) nmbd : schedule_timeout (process_timeout)
0.4% ( 0.1) <kernel core> : neigh_add_timer (neigh_timer_handler)
0.4% ( 0.1) <kernel core> : queue_delayed_work (delayed_work_timer_fn)
0.4% ( 0.1) xfssyncd : schedule_timeout (process_timeout)
=================================
and here's the "idle" state with vdr:
=================================
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (29.4%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.0ms ( 0.0%) 188 Mhz 100.0%
C3 0.2ms (70.5%)
Wakeups-from-idle per second : 2878.8 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
60.2% (4431.3) USB device 5-1 : DVB-T 2 (Afatech)
39.4% (2897.7) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
0.1% ( 7.7) klogd : ehci_work (ehci_watchdog)
0.1% ( 5.1) vdr-kbd : schedule_timeout (process_timeout)
0.1% ( 4.4) <interrupt> : uhci_hcd:usb3, eth0
0.1% ( 3.7) vdr-kbd : futex_wait (hrtimer_wakeup)
0.0% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.0% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
0.0% ( 1.0) ifconfig : b44_open (b44_timer)
0.0% ( 0.9) kdvb-ad-0-fe-0 : schedule_timeout (process_timeout)
0.0% ( 0.6) <kernel core> : sk_reset_timer (tcp_delack_timer)
0.0% ( 0.6) mpd : sk_reset_timer (tcp_write_timer)
0.0% ( 0.5) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn)
0.0% ( 0.3) <kernel module> : neigh_table_init_no_netlink (neigh_periodic_timer)
0.0% ( 0.2) <kernel core> : __netdev_watchdog_up (dev_watchdog)
0.0% ( 0.2) xfssyncd : schedule_timeout (process_timeout)
0.0% ( 0.2) runsvdir : schedule_timeout (process_timeout)
0.0% ( 0.2) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer)
0.0% ( 0.2) init : schedule_timeout (process_timeout)
0.0% ( 0.1) syslogd : do_setitimer (it_real_fn)
0.0% ( 0.1) nmbd : schedule_timeout (process_timeout)
=================================
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