On Mon, Mar 23, 2009 at 05:02:54PM +0200, Antti Palosaari wrote:
> Heinrich Langos wrote:
>> How about a module option to force usage of the PID filter?
>> Should be easy to add if the code for enabling it on demand is aready
>> there.
>
> It is there.
> modinfo dvb-usb
Wow!
I tried it and using the pid filter greatly reduces system load!
In short it cuts minimal system load for transfeing a tv
program from 30% to 1.3% !!! (Yes, I think this deserves
three exclamation marks.)
with vdr it reduces the idle load from 37% to 19% (and yes,
i waited about a minute after starting vdr to let it settle)
below are some cut'n paste numbers from powertop for the
curious.
now, are there any negative side effects to enabling the
pid filter that one has to expect?
is it still possible to record two stations that are send
over the same OTA channel?
if yes, can reprogramming of the pid filter cause lost
packages for a already running recording?
cheers
-henrik
More details:
i ran zap and vdr on a system that is idle and without either
does about 5 wakups per second. polling of the remote is disabled.
vdr is the one from e-tobi.net/vdr-experimental lenny vdr-extensions
here's the list of plugins that were enabled during the test:
| Searching for plugins (VDR 1.6.0-2/1.6.0) (cache hit): epgsearch quickepgsearch conflictcheckonly live epgsearchonly ffnetdev streamdev-server.
#####################################################
==================== remote disabled, pid filter disabled
------------------ running zap
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (30.2%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.4ms (49.7%) 188 Mhz 100.0%
C3 0.1ms (20.1%)
Wakeups-from-idle per second : 3205.5 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
59.6% (4761.9) USB device 5-1 : DVB-T 2 (Afatech)
40.2% (3206.1) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
0.1% ( 5.7) zap : schedule_timeout (process_timeout)
0.0% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.0% ( 1.8) xfsbufd : schedule_timeout (process_timeout)
------------------- running vdr
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (37.0%) 750 Mhz 0.0%
polling 0.0ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.4ms (21.2%) 188 Mhz 100.0%
C3 0.2ms (41.8%)
Wakeups-from-idle per second : 2507.8 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
58.9% (4300.1) USB device 5-1 : DVB-T 2 (Afatech)
37.6% (2744.9) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
3.0% (220.7) vdr : futex_wait (hrtimer_wakeup)
0.2% ( 12.9) <interrupt> : rtc0
0.1% ( 6.0) vdr : schedule_timeout (process_timeout)
0.1% ( 5.3) vdr : hrtick_set (hrtick)
0.0% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.0% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
#######################################
------------------ remote disabled, pid filter enabled:
------------------ running zap
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 1.1%) 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 10.6ms (98.9%)
Wakeups-from-idle per second : 96.2 interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
50.3% ( 72.9) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
34.3% ( 49.7) USB device 5-1 : DVB-T 2 (Afatech)
5.7% ( 8.2) <kernel core> : ehci_work (ehci_watchdog)
3.8% ( 5.5) zap : schedule_timeout (process_timeout)
1.4% ( 2.0) xfsaild : schedule_timeout (process_timeout)
1.1% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
------------------ running vdr
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (18.7%) 750 Mhz 0.0%
polling 0.1ms ( 0.0%) 563 Mhz 0.0%
C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0%
C2 0.1ms ( 0.3%) 188 Mhz 100.0%
C3 0.8ms (81.0%)
Wakeups-from-idle per second : 1044.2 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
49.4% (1137.5) USB device 5-1 : DVB-T 2 (Afatech)
40.1% (922.4) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel
9.6% (220.8) vdr : futex_wait (hrtimer_wakeup)
0.3% ( 6.2) vdr : schedule_timeout (process_timeout)
0.2% ( 5.6) <kernel core> : ehci_work (ehci_watchdog)
0.1% ( 2.0) xfsaild : schedule_timeout (process_timeout)
0.1% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
0.0% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup)
#########################################
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