Hi, On Tue, Nov 8, 2011 at 5:20 PM, Musayev, Ilya <imusa...@webmd.net> wrote: > I have IBM/Intel 2x10 CPU servers and HP/AMD 2x12 CPU servers running > RHEL5.4 stock kernel, soon to go 5.7 latest.
I don't have any servers with the 10 core CPUs, but I've got a Dell R910 running Cent5.7 with 4 of the 8 core X7550 cpus and it's showing cs/s of 1300 - 1600 with a load average of ~1 . On a Dell R515 with 2 x 6 core opteron 4184 processors running Cent6.0 also with a load average of ~1 it's showing 900 - 1000 cs/s . On a Dell R815 with 4 x 12 core opteron 6174 processors at idle (~0 load average) it's show 175 - 350 cs/s . I used dstat to get the csw (same as vmstat 1). > 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. The latter is not normal. HTH, Sabuj > 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 > > > > _______________________________________________ > rhelv5-list mailing list > rhelv5-list@redhat.com > https://www.redhat.com/mailman/listinfo/rhelv5-list > > _______________________________________________ rhelv5-list mailing list rhelv5-list@redhat.com https://www.redhat.com/mailman/listinfo/rhelv5-list
