ASUS E45M1-M PRO Latency Issues

Hi

I searched this forum and found that the mentioned bord can do servo threads with 5kHz...

I bought it and have now a latency jitter of 27000-38000ns?

I found the C6 and p-step disabling info and did it, also tried isolcpus.
Doesnt work out...

What did I do wrong?

best regards

I have one running 4-5 KHZ without trouble and ~12 usec worst case jitter
What peripherals do you have?

There is a serial/parallel port PCI card which is not used (no driver loaded), nothing else.
Hard disk is a Kingston SSDNow 120GB SATA, 8GB Ram (4 used)

System runs 5i25 / 7i77

I have disabled all Clockstepping, sleepmodes, NX and stuff in the Bios.

Best regards

I have a standard SATA hard drive (WD) 4G RAM
disabled C6 and Cool & Quiet but thats it
Tried Isocpus and saw no major difference either way

with isolcpus the latency is 6000-8000 for the first 3-5 seconds, then it goes up to 30000-40000
Without isolcpus it is >20000 from the beginning.

Yes, I am using the on board video

me too ^^

I wouldn't mind, but I told my buddy to buy this board for his new machine and now this

Just a couple of thoughts

There is a serial/parallel port PCI card which is not used (no driver loaded),

There are no drivers anyway, try removing it so it is not allocated an interrupt and see if it makes any difference.

If it does try it in another slot

Blurb makes great play of ASUS Fan Xpert which sounds like a recipe for unwanted low level activity.
Can you just turn it all off and have the fan at a fixed speed the whole time?

Try the kernel parameter nohalt with and without isolcpus=1, can reduce latency caused by interrupt idle/sleep

regards