I just did a minor system update on my desktop. As I finished that, I realized I had enough hardware lying around to make myself a fileserver that should do fairly well on the grid, too. So I set everything up, get things working, and finally go to set up BOINC. When the first benchmarks came through, I was getting a little over half the speed I got off the same CPU on my desktop per core. (an X2 3800, now benching at 1.059GFlops per core) The early times for the WCG work units (crunching two HDC units now at 5-6 hours per) seem to bear out this estimation. The CPU seems to be running just fine, at 2000mhz, BOINC is using both cores as expected, top indicates the processes are getting 99% of the CPU or so...

So since the hardware is basically the same (RAM, CPU, etc) as it was when it was in my Windows box, only the system board being different, why am I losing so much speed in Linux? The only hardware-based conclusion I've been able to come up with is that the nvidia 6150 based board is hogging so much memory bandwidth for video that it's slowing the system down that much, but that doesn't seem likely to me. Anyone have any ideas?