[vdr] Re: performance during cutting

[thees@informatik.uni-kl.de]

On 26 Mar, Axel Gruber wrote:
>> Mh, even if I get a continuous transfer rate of 20 MB per second
>> (10 MB/s for reading and 10 MB/s for writing, which is pretty good
>> performance on the same harddisk), cutting a simple 120 minute film will
>> take about 5 Minutes (2*1.5GB / (10MB/s) = 300s).
> 
>> So cutting takes a little more than "a few seconds"!
> 
> 
> I agree with you - but the CPU-Speed should be not so high at a big
> HD-traffic - otherwise anything is wrong at the system.
> 
> When i make a Cutting i can watch a other Movie without any problems.


So exactly this is my problem. Sometimes I can watch a recorded movie
during cutting (even if I will have to wait for 30 seconds until I can
select one), but sometimes I canīt even switch between channnels in
order to watch life-tv, because vdr blocks until it times out and
restarts (and aborts the cutting done so far :-((

Maybe there are other file IOs (e.g. reading/writing EPG-data during
zapping?) which compete with the cutting thread for disk access? 
I didnīt check CPU-load in these situations, yet. But I know that
sometimes cutting nearly locks me out of the system.

So just tell me, is this normal operation or is there a problem with my
machine?

Harddisk transfer rate is ok, DMA is enabled (ok, I will have to check
if it gets disabled during operation). Next time I will try to disable
all power management functions of the BIOS setup. Any further ideas?


Joachim

-- 
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 Joachim Thees <thees@informatik.uni-kl.de>
 Univ. of Kaiserslautern, Computer Networks Group
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