PCI latency

Music Manic · Post by **Music Manic** » Mon Dec 05, 2005 4:42 am

Just wondering what you guys set your Pulsar cards to and your graphics cards.

I have Pulsar2 and two pulsar 1s.Since I set them all to 64 I get scope.sys crashes occasionally.

What about you guys?

MD69 · Post by **MD69** » Mon Dec 05, 2005 4:47 am

PCI Latency 64 for PowerPulsar (128 samples latency in ULLI).

Sound like the Pulsar1 is driving the game! Should swap to your PulsarII in your configfile (board0 / Board1 definition)

djmicron · Post by **djmicron** » Mon Dec 05, 2005 5:42 am

i'm using 64 with pulsar1 + 2x scope srb (first model) but i've tryied with 32 and nothing change with the recent mainboards as asus k8n or gigabyte k8ns pro, but with my older cusl 2 a 32 pci latency timer caused pci master overflows..

ABOUT latency i'm using 512 because the pulsar 1 is the only with i/o....

samplaire · Post by **samplaire** » Mon Dec 05, 2005 1:32 pm

On 2005-12-05 05:42, djmicron wrote:
ABOUT latency i'm using 512 because the pulsar 1 is the only with i/o....

Correct me if I wrong but it has nothing to ULLI. If one card is the so called 'new generation' - and I presume from your words you have an XTC - then you're entitled to use smaller ULLI than 12ms at 44kHz.

djmicron · Post by **djmicron** » Mon Dec 05, 2005 1:57 pm

The Pulsar one is the only provided with phisical i/o, the other 2 cards are 15 dsp first generation scope srb, so, from the ulli settings i can set the latency lower than 13 ms@44100, but when restarting a message inform me that the latency is too low for the pulsar one and nothing change.
If you know a way of using a lower latency using the pulsar one i/o, please let me know

MD69 · Post by **MD69** » Mon Dec 05, 2005 2:06 pm

DJMicron,

If both your card are first generation (the same 15 DSP board available for DP) I think you are correct. Remember a mate who had to send the board to creamware.

samplaire · Post by **samplaire** » Mon Dec 05, 2005 2:34 pm

Ok, I withdraw... I thought you had at least one second generation card (from your text 'my only i/o card is pulsar1' I could suspect this, but if you wrote 'my cards are first generation' I would have had no suspections

<font size=-1>[ This Message was edited by: samplaire on 2005-12-05 14:36 ]</font>

Counterparts · Post by **Counterparts** » Tue Dec 06, 2005 1:14 am

Never bothered with PCI latency settings, never really had any problems either.

TBH, I doubt that it'll make a whole bunch of difference. Modern BIOSes can ignore/override card latency settings if they want, forcing fairness (fixed max latency) - across all devices on the bus.

The system is dynamically adaptive and IMO that's the best way to let it operate.

Royston