[vdr] Re: sound clicks and "block artefacts" with Nova-CI

[Andreas Vierengel <vdr@vierengel.de>]

Am Sa, 2003-08-23 um 16.56 schrieb Timo Helkiö:
> On Sat, 2003-08-23 at 15:43, Andreas Vierengel wrote:
> > Hi,
> > 
> > I have used VDR for 3 month so far with a Nexus-s(rev 2.1) and nova-ci
> > (rev 1.1) connected via a sat-multiswitch (no diseqc) without problems.
> > A few days ago I bought new computer hardware:
> > P4-Celeron 2.4GHz, MSI-845-GE MAX-L Mainboard, 350W Enermax Powersupply
> > and a new computer case.
> > My old system was an 433 MHz Celeron (PII) on an asus p2l97 Maibnboard.
> > storage-system: 4x 120GB Seagate IDE => software raid5 and raid1 for
> > booting.
> > 
> > Sofware is/was: debian linux 3.0, vanilla-kernel 2.4.21, vanilla
> > vdr-1.2.2, liunxtv-dvb-1.0.0, gcc-2.95.4
> > 
> > My problem is:
> > recording on Nova-CI ( I don't use a cam-module at the moment) produces
> > sound clicks, block-artefacts and small skips on every channel. The
> > recording is not usable anymore :(
> > recording on my nexus-s works perfectly the same like in my old
> > computer-system.
> > 
> > I changed PCI-Slots for both cards, tested any pci-latency setting,
> > tested shared/unshared interrupt combinations => no effect.
> > 
> > On software side I only rebuilt my kernel with optimization for P4,
> > recompiled DVB-drivers and VDR.
> > 
> > The whole thing is driving me nuts, so I'm at the point to throw out the
> > nova and buy another nexus...
> > 
> > What can I do further to investigate the problem ?
> > Thanks in advance for any help !!
> > 
> > --Andi
> > 
> > 
> 
> Check if DMA for HD is on.
> 
Thanks for the answer !

It is already on for every harddisk.
hdparm -d 1 -m 16 -c 1 -u 1 -X67 /dev/hd[a-d].

This cannot be the problem, since my nexus-s does record perfectly.
My old system was only multiword-dma 2, which is slower than UDMA3,
which I use now ( I had to use UDMA3, since kernel 2.4.x does have
problems with UDMA >3 under load ). My throughput (tested with hdparm)
was about 13MB/s with my old System and is now about 35MB/s.
My Nova did record perfectly with the old, much slower io-subsystem...

--Andi



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