On 10/04/2007 03:19 PM, Luca Tettamanti wrote: >>>>>> The latter seems to be utime ...decreasing. No wonder if >>>>>> arithmetics will give strange results (probably top is using >>>>>> unsigned delta?)... >>>>> Hmm, minor miscounting from my side, stime seems more appropriate... >>>> So, is it normal that stime decreases sometimes or a kernel bug? >>>> /me expects the last... >>> Let me guess... Dual core AMD64 ? >> Nope: Intel(R) Pentium(R) D CPU 3.20GHz > > I just notice the same thing here, with a Core2 Duo (which is supposed > to have synced TSCs) and working HPET. > >> The following may well be relevant. >> With 2.6.22 and early 2.6.23-rc kernels (rc3-rc6) I often had this in my >> kernel log (see http://lkml.org/lkml/2007/9/16/45): >> checking TSC synchronization [CPU#0 -> CPU#1]: >> Measured 248 cycles TSC warp between CPUs, turning off TSC clock. >> Marking TSC unstable due to check_tsc_sync_source failed > > I don't see this though, TSCs are always syncronized between the 2 > cores. >
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