[Ardour-Users] gak

DA. Forsyth steampipe at iwr.ru.ac.za
Mon Nov 12 23:55:34 PST 2007

On 12 Nov 2007 at 18:47, Martin Lynch murmured decisively:


> Hi David,
> disks' fault (which have no problems simultaneously capturing and 
> playing HD TV signals, for example, in full 1080 glory...). And before 
> the obvious question arises, it's NOT a case of the drives not being DMA 
> enabled - they're 2 X 320 GB Seagate SATA 2 @ 7200RPM: cached reads = 
> 761.46 MB/sec; buffered disk reads = 148.93 MB/sec with Ardour running 

that is a hell of a lot faster than mine.  initial test was 3gb/s, and by 
enabling 32bit mode I doubles it to just over 6GB/s.   seems Fedora is 
considering my SATA drives as IDE drives due to my BIOS settings.
I'll fix it next week, or later when I upgrade from FC5

> I did notice that there were an inordinately high number of regions - ie 
> perhaps 50+, which was odd given I'd only tried to record the damn thing 
> maybe 4 times. I'm blissfully ignorant about programming etc but I won't 
> let that stop me from suggesting it's a RAID implementation error in 
> Ardour...

remember that all regions are read during playback, even if they are 
beneath a topmost region that is what you actually hear.

> As for the sample rate, I'm unfamiliar with the M-Audio 1010 (I use 
> M-Audio FireWire Solo) but are you sure the device is capable of 44K? 
> Some devices are fixed at what amounts to a "native resolution" which 
> jack can't alter...

yes it can do 44.1k, it is listed in the options.  I've had it doing 96k, 
so I know I can change it, just cannot figure out how right now (-:

> Can you get it working at 88.2K, then halve the sample rate afterwards?

that would use too much disk space (-:

> Good luck and sorry I can't be of more help, and here's hoping there's a 
> solution for the very frustrating "Disk Can't Keep Up" message - I 
> certainly can't trust Ardour to record live music until there is!!!

my solution was using 
hdparm -c1 /dev/hda and /dev/hdc
to set 32 bitmode.  I could not enable DMA and other fun things, but did 
get a lot more speed and successfully mixed 3 songs.

David                       http://iwr.ru.ac.za/~iwdf/
If you receive email saying "Send this to everyone you know",
           PLEASE pretend you don't know me.

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