My check on RHEL 5.7 seems to show the same results for both vendors. I cant believe there ~120 times more interrupts for IBM Intel hardware VS HP AMD hardware, unless there is a bug on CS reporting for AMD or Intel.
________________________________ From: Musayev, Ilya Sent: Tuesday, November 08, 2011 6:20 PM To: 'Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list' Subject: Context Switching and what is normal I have IBM/Intel 2x10 CPU servers and HP/AMD 2x12 CPU servers running RHEL5.4 stock kernel, soon to go 5.7 latest. What I find weird is that on HP AMD servers with vanilla OS and no apps, my context switch count is very low somewhere in 50 cs/s VS IBM Intel servers with vanilla OS and no apps ranging in 6000 cs/s. Both are idle and not doing much other than typical OS operations. I'm curious why, I did hear in past that AMD CPUs do better with CS due to special instruction sets, but it should not be this drastic. The check is done via sar -w 5 5 and vmstat. Why is this occurring? Is this normal? Does anyone else see this behavior? Thanks ilya
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