[PlanetCCRMA] Were's the weak link?

[Ken Dawson]

Did you remember to shut off removable media auto-mount probing?

/ken

linuxmedia4@netscape.net wrote:
> Hi,
> 
> I installed the Indigo IO card on my FC5/CCRMA system. I've done 
> everything I could think (or was suggested) to optimize my system to 
> allow for smooth, uninterrupted recording, including buying a 7200rpm 
> drive, tunning my hard disk, trying different 'Frames/Period' and 
> 'Periods/Buffer' settings in qjackctl. I read several articles about 
> IRQs but haven't changed anything in relation to IRQs because I was 
> under the impression that FC5/CCRMA has a program that reorders the IRQs 
> so the sound card is favored. But any input on IRQs (or anything) is 
> welcome.
> 
> I'm running ecasound and jackd (both with realtime priorities). When 
> recording or in playback, sometimes I hear disruptions, but they don't 
> always end up in the actual recording. But there are *always* a few 
> noticeable pops, clicks or the (rare) loss of data in the actual 
> recorded audio files.
> 
> Can anyone spot where the "weak link" is in my system. I put in this 
> post (what I believe) is the most relevant information...
> 
> My system...
> Dell Precision M50 laptop
> 2 GHz Processor
> 1 Gig Ram
> 2.6.16-1.2080.16.rrt.rhfc5.ccrma
> 7200rpm hard drive
> 
> 'cat /proc/interrupts' shows:
> 
>   0: 3945911  XT-PIC [........N/  0]  pit
>   1:    2898  XT-PIC [........./  6]  i8042
>   2:       0  XT-PIC [........N/  0]  cascade
>   5:   16931  XT-PIC [........./  0]  Intel 82801CA-ICH3 Modem, Intel 
> 82801CA-ICH3
>   7:       4  XT-PIC [..P....../  0]  parport0
>   8:       1  XT-PIC [........./  0]  rtc
>   9:       2  XT-PIC [........./  0]  acpi
>  11:    8900  XT-PIC [........./  0]  yenta, yenta, yenta, pcmcia2.0, 
> Indigo IO, uhci_hcd:usb1, uhci_hcd:usb2, ohci1394
>  12:   78714  XT-PIC [........./  6]  i8042
>  14:   74419  XT-PIC [........./  1]  ide0
> NMI:       0
> LOC:       0
> ERR:       0
> MIS:       0
> 
> '/sbin/hdparm /dev/hda' shows...
> 
>  multcount    = 16 (on)
>  IO_support   =  3 (32-bit w/sync)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 16383/255/63, sectors = 117210240, start = 0
> 
> (3 reads of) 'hdparm -Tt /dev/hda'...
> 
> /dev/hda:
>  Timing cached reads:   1368 MB in  2.00 seconds = 683.60 MB/sec
>  Timing buffered disk reads:  112 MB in  3.03 seconds =  36.93 MB/sec
> /dev/hda:
>  Timing cached reads:   1368 MB in  2.00 seconds = 682.87 MB/sec
>  Timing buffered disk reads:  120 MB in  3.02 seconds =  39.68 MB/sec
> /dev/hda:
>  Timing cached reads:   1368 MB in  2.00 seconds = 683.64 MB/sec
>  Timing buffered disk reads:  120 MB in  3.02 seconds =  39.75 MB/sec
> 
> Thanks,
> Rocco
> 
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