Messages in this thread |  | | Date | Tue, 18 Mar 2003 13:14:21 -0600 (CST) | From | Thomas Molina <> | Subject | Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) |
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> > You can run this (stupid) test-program to try. On my P4 I get > > > > empty overhead=320 cycles > > load overhead=0 cycles > > I$ load overhead=0 cycles > > I$ load overhead=0 cycles > > I$ store overhead=264 cycles
On my Athlon 1.3GHz system I get: [tmolina@dad tmolina]$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 4 model name : AMD Athlon(tm) Processor stepping : 2 cpu MHz : 1343.030 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow bogomips : 2637.82
empty overhead=16 cycles load overhead=1 cycles I$ load overhead=1 cycles I$ load overhead=1 cycles I$ store overhead=763 cycles
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