HPL low performance result.

Dear Everyone,
I used Pelican HPC to make my own cluster. I had 5 nodes including frontnode. Its all the same PCs Intel Pentium core2duo 1.8 GHz with 1024MB RAM connected throw 100Mbps 5port switch. I tried to run HPL on first node with default setting in HPL.dat, and result was 2,476 Gfpops (7,2 sec). Then consecutively conected one more node = 2,34 Gflops (7.71 sec). With third node 1,893Gflops (9,3 sec), fourth 1,88Gflops (9,56 sec) and finally whole 5 nodes cluster was 1,893 (9,52 sec). The performance is decreesing with more added nodes  :(  Do you have any solutions for this?



Best Regards Martin Cech.