Do I have a strange latency issue?

Possible Latency spike issues

The problem I am having is trying to determine my max latency (besides being a noob)
When I use either the integrated graphics or the ATI card and absolutely nothing running but whatever runs at boot with RAM in non-interleaved mode and the Latency-Test going my Max Latency starts out at (1ms)996100, 1600 and (25us) 27591, 2752 they both slowly crawl up about 10-15% the (25us) reading crawls up a little more than the (1ms) until about 1800 and 2300 respectively over a period of 10-15 minutes sometimes longer, then all of the sudden it jumps to (1ms) 35079 and (25us) 39598 and it will grow slightly over an hour or so. I can reset the Latency-test and it starts all over with same spike after 10-15 min. I have better performance with the ATI card installed with driver that comes with the Live CD install and I can run at least 6 instances of glxgears with little effect each using about2% memory according to system monitor but I still have the same problem...... if it is a problem?. Also I have not connected to the stepper controller and motors at all.

From what I have read this doesn't match the typical latency spike profile,
The PC I am using is:
Dell Poweredge SC420 with an Intel P4 2.8Ghz 800Mg FSB
speedstep is not an option in this limited bios
2 512k DDR2 ECC matched pair and 1 stick of 256k DDR2
Integrated Intel Graphics and or an ATI Radeon x300 graphics card
I have all power management turned off, hyper threading turned off (everything I can turn off in bios that is listed in the wiki) and I have tried both dual interleaved mode with just the 2 ECC sticks (Problem is worse in this mode) and found better performance in asymmetric mode with the all three memory sticks.
Debian Wheezy Linuxcnc 2.7 live CD installed.

I have another slower system Dell Dimension 1100 running ubuntu-10.04-linuxcnc1-i386 Emc2 2.4 and I have the same issues. But worse latency performance.
Thanks in advance for any help.

Do you use, w-lan instead of cable lan. I have seen only that is some 12 times slower as with cable.

That is with no Ethernet connected and USB wireless dongle unplugged, I figured I needed to eliminate everything possible to chase this apparent non-issue down. thanks for the replay

Thank you tommylight, you have no idea how happy I am to hear that I don't have a giant goose egg of a server. I'm pretty excited to finally get to the stage where I'm wiring everything up and installed the Linuxcnc. I thought I was in for more expenses, I have been chasing this for 4 or 5 days and was ready for the hammer treatment. I'm not sure about the software step generation, I haven't gotten that far yet, it took me 3 years to build my CNC machine. I will be using the parallel port to start, I'm not exactly sure what a Mesa card is but if it needs anything other than a PCI X1 or strait PCI slot I'm out of luck.The drawback to those Dell Poweredge servers is they took half the pins out of the one and only PCIe X16 slot and call it an X8, you have to cut 2 dividers out of the plug just to install a video card and run as X8. Is software step generation necessary with the Gecko G540?

I already bought the G540 and It's been sitting around for a year waiting on me to get to the point I'm at right now. Would you tell me how you remove the input divider? I was an electronics tech for almost 30 years, If someone points me in the right direction I can usually get most anything done with electronics (Excluding PC's....I hate them) I had at first made my own breakout board and driver board from a design posted in the net using an A3979 as the Controller/Driver I.C. but I bought the 540 to save time. I have only completed 1 axis so far and it is untested as of yet.

How much will the precision suffer with the input divider x10? I am building this to make fairly precise parts...I hope.
I am using ACME 1/2-10 rod to drive the axis, I did this on purpose, not really to be cheap but so I could have very movement on a per revolution basis. I am fully uninformed when it comes to the quality of the ball screws available out there that are affordable in the length I need and can always add them later if needed (As you can probably tell I'm not in much of a hurry). So far I have no measurable backlash measuring with a dial indicator on each axis. I'm not too concerned with speed but I don't want to wait 3 weeks for a part either.