[linux-dvb] Re: blocking FE_SET_FRONTEND ioctl in non-blocking mode

["Franck Arnaud" <franck@nenie.org>]

Andrew de Quincey:

> I don't get this. I'm using a grundig_29504-401 under linux 2.6.6-rc3. I 
> patched dvbtune to time FE_SET_FRONTEND:
> 
> -----
> ceridwen dvbtune # ./dvbtune -f 634166670 -qam 16 -gi 32 -cr 3_4 -bw 8 -tm 2 
> -m
> Using DVB card "Grundig 29504-401"
> tuning DVB-T (in United Kingdom) to 634166670 Hz, Bandwidth: 8
> time taken: 0 sec, 39966 usec
> -----
> 
> Which version of the driver are you using? 

That was with CVS dvb-kernel, checkout from March 25, 
with kernel version 2.4.26. 

I have now tried again with current CVS from the linux_2_4 
branch. I have also realised that I was in error yesterday 
and actually timing two consecutive tuning on the TDA 
(5s from cold, 700 ms from warm). I've actually timed 
the grundig this time and it takes 3-4 seconds from 
cold, 500 ms from warm. I've also noted the very first 
tuning attempt after booting is fast like a warm one.

> Is 39ms an acceptable figure,

It should be good enough, much better than 5 seconds :-).



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