[linux-dvb] Re: High error rates when running Athcool

Uwe Maier umaier at gmx.de
Tue Feb 7 13:55:29 CET 2006

For me it indeed makes a difference: 66W vs. 105W (and 40W fewer power 
consumption means fewer 40W to cool -> less noise).

On higher load (more than 3 recordings at the same time) I get artefacts 
(lost frames) so I switch it off when a recording starts.


Rudo Thomas wrote:

>>To keep the power consumption of the machine down I use 'Athcool'.
>>This utility tweaks registers on the Northbridge chip so that when the
>>CPU is idle it goes into a 'deep sleep' mode where is uses very little
>>power. The downside is that it takes much longer for the processor to
>>resume, so interrupt latency is greatly increased, though I have never
>>before seen any problem in use.
>>I get fairly poor reception of UK Freeview on the system, and an
>>aerial upgrade hasn't improved it much. I've just realised that
>>Athcool may be to blame. This is the output of 'dvbtune -m' on C5 with
>>Athcool running:
>>Signal=14135, Verror=11891, SNR=40349dB, BlockErrors=99, (S|L|C|V|SY|)
>>Signal=14135, Verror=13445, SNR=39578dB, BlockErrors=191, (S|L|C|V|SY|)
>>Signal=14135, Verror=12998, SNR=42662dB, BlockErrors=188, (S|L|C|V|SY|)
>>And this is with it off:
>>Signal=14135, Verror=1497, SNR=51143dB, BlockErrors=0, (S|L|C|V|SY|)
>>Signal=14135, Verror=1385, SNR=50115dB, BlockErrors=0, (S|L|C|V|SY|)
>>Signal=14135, Verror=1366, SNR=51143dB, BlockErrors=0, (S|L|C|V|SY|)
>On my system (Athlon XP 1800+, ASUS A7V333), athcool does not make a
>difference. The card is
>saa7133[1]: subsystem: 5168:0306, board: LifeView FlyDVB-T DUO [card=55,autodetected]
>In cz-Praha, I get the following regardless of athcool settings:
>Signal=40349, Verror=38170, SNR=65021dB, BlockErrors=0, (S|L|C|V|SY|)
>Signal=40349, Verror=43736, SNR=64764dB, BlockErrors=0, (S|L|C|V|SY|)
>Signal=40349, Verror=45370, SNR=64764dB, BlockErrors=0, (S|L|C|V|SY|)
>PS: Please CC me on replies as I am not subscribed to the list. Thanks.
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