RE: OT: high WIO on Linux

>>>
>>>First of all, Linux sucks. Let me clarify things a bit: the
>>>whole concept of %WIO makes me cringe. CPU works in user
>>>mode, kernel mode, is on the interrupt stack or is idle.
>>

I agree with Mladen on on this aspect of Linux (and many others). The %WIO thing is goofy. I should point out, however, that the interrupt handlers are kernel mode cycles. So it is actually, Kernel,User, Idle loop. This is why a broken (chatty) hardware device runs CPUs to saturation in kernel (sys) mode.

From a database perspective, Linux is about where good Unix implementations where circa 1995. There were so many Oracle-special OS features that the OSDs could exploit for scalability that Linux can't dream of offering because the focus of Linux is not RDBMS and the hardware is too general purpose--albeit EXTREMELY fast in the case of AMD.

Like I say, Linux stands for (L)inux (I)s (N)ot (U)ni(X). But that doesn't make it hopeless either. You just have to watch your expectations.

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