Hello All, I have tried to benchmark Squid on EM64T (Extended Memory 64 bit technology). System Details ========== System Model - 2.6.5-1.358smp x86_64 x86_64 x86_64 GNU/Linux Processor Model - model name : Intel(R) Pentium(R) 4 CPU 3.40GHz X 2 processors Memory - 256 MB Processor Activity with vmstat ===================== procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 5 325468 2156 8100 3532 1724 381 1866 381 1710 232 0 1 28 71 0 1 325468 4368 8248 5324 565 486 1077 498 1256 176 0 1 2 97 0 1 325492 2540 8256 5400 1932 235 1932 253 1381 238 0 1 42 57 I have found problem because of CPU as, 1) Proxy Server is working fine during Warm, Inc phase with the CPU usage 50% to 75%. During top phase cpu usage is reduced to 3.4% - 5% so that benchmarking getting problem on 500 clients itself. System error message log /var/log/messages did not have any messages for the problem. Is there any way to detect the functionality issues of a processor which causes problem for benchmarking? Plz. share your knowledge on getting problem because of CPU. Thanks, -Muthukumar.