Quote:
Originally Posted by valis  What Timur means is that there isn't a 1:1 correlation with your DPC latency results and your "this is how low my ASIO buffer goes" results. Deferred Procedure calls that are excessively large just indicate there's a resource conflict (or crummy driver more typically) and is just 1 of many tools used to troubleshoot things. So please let's not perpetuate a myth that it's an essential statistic when tuning an audio machine.
For instance I get a significantly higher DPC latency figure on my 8 core Xeon than I do my tiny AMD triple core box. Yet the Xeon will trounce that machine when it comes to any audio related task that's not single threaded, including handling the lowest buffer settings on large projects significantly better. Another good example of how judging by only the DPC figures could easily omit more important info would be when one machine is significantly older & slower. I have 2 machines here, one gets 15us under Xp32 and the other gets 90-110us in Win7. Based on that info alone, what does it tell you? Nothing really, since my 2001 era Prestonia Xeon rig with Xp32 gets 15us compared to 90-110us on my 2008 Xeon. There is still a difference there since the older box is on the RTC clock and the newer one is using HPET under Win7, but guess which still gets lower buffer settings ? |
So let me clear my point.
Of course I don't think the ASIO buffer is directly correlated to DPC results, nor do I mean to perpetuate a myth I was not aware of. I also don't strive to have the lowest result possible.
Yet, this system has been (is?) unstable and I was asking if someone could see in my results a known behaviour, possibly caused by a component, driver or some hardware combination.
The 150-200 micro-seconds latency is by no means disturbing, but the fluctuations up to 700-800 just make me think there's something strange going on. In fact, today drop-outs on
single channels in Cubase reappeared in the XP install - the one with the better measured results
By the way, thanks for your opinion as well.