On Fri, Nov 14, 2003 at 08:26:55AM +0100, Svante Signell wrote:
For the erroneous motherboard with a 1.3GHz Tualatin CPU the numbers are around 400ns independent of array size. The only thing changig is that the latency numbers increase to 440-460ns for large values of the stride. My interpretation is that not even the L1 cache is working properly. All other tests indicate a _very_ slow CPU, around 7MHz is measured by lmbench (BTW how good is this value?) compared to the expected 1.3GHz. Two questions immediately arise.
- Is this slowness reasonable if _no- caches are working properly?
- If there is a problem with the on-chip voltage regulator and the CPU
clock speed is really 7MHz, as measured by lmbench, can the CPU operate properly at this low speed. I thought there was a _lower_ limit as well as an upper limit for the operating frequency?
What do these commands say?
cat /proc/mtrr cat /proc/cpuinfo