Hi :)
your mail is the only mail I'm able to read today, resp. I even have no
time to read your mail, but I'm to curious to delay reading it ;).
I don't have latency issues, but jitter. 1/4 @ 120 BPM = 500 ms, 1000
ms, 1500 ms, 2000 ms etc. ... Cubase = Windows XP, the others are timers
used as sequencer timer source for Qtractor on 64 Studio 3.0-beta3:
||Cubase|HR tmr|System|PCM pl|PCM ca
------++------+------+------+------+------
500.0|| 493.0| 504.9| 505.6| 503.4| 503.2
1000.0|| 993.4|1005.4|1005.8|1005.3|1006.4
1500.0||1494.5|1503.6|1506.4|1507.4|1507.3
2000.0||1994.8|2003.8|2007.2|2007.9|2009.5
2500.0||2492.4|2504.1|2504.3|2503.6|2503.2
3000.0||2992.9|3006.0|3006.2|3005.9|3007.6
3500.0||3493.7|3502.7|3505.4|3506.5|3509.5
4000.0||3994.6|4003.1|4003.2|4008.8|4009.9
msec +/- 0.1 msec
maxDif|| 4.8| 6.0| 7.2| 8.8| 9.9
minDif|| -2.4| -2.7| -3.2| -3.4| -3.2
--------------+------+------+------+------
Jitter|| 2.4| 3.3| 4.0| 5.4| 6.7
msec +/- 0.2 msec
More information about this will follow next year.
> Gigabyte GA-M51GM-S2G F16A , Athlon X2 4600+, 4Gb memory
> RME HDSP multiface
> Midiman 8x8 on USB extender.
>
I'm missing one information. Does your graphics use the main memory for
frame buffer or has the graphics it's own memory?
I'm using an on-board graphics, thus it needs to access the main memory,
because it doesn't have it's own memory.
Purely hypothetical: Using the same RAM for Linux and the graphics might
cause unwanted interrupts and timing issues. After a short search in the
www I guess you are using a graphics with it's own memory.
I reckon your BIOS is upgraded?!
The computer I'm using has got a CPU model "AMD Athlon(tm) X2 Dual Core
Processor BE-2350", socket AM2. The MIDI interface is an Swissonic USB,
a very cheap one.
Again, more information next year.
I'm not able to use my external MIDI equipment with the PC. Using the
Atari ST or Commodore 64 there were no problems.
Cheers,
Ralf
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