Re: tar x cpu bound

[mlelstv%serpens.de@localhost (Michael van Elst)]

ef%math.uni-bonn.de@localhost (Edgar =?iso-8859-1?B?RnXf?=) writes:

>Even if tar (and pax, which I also tried) was to use stdio, this would not 
>explain being bound by /system/ cpu time.

With a smaller stdio buffer, you do more read/write syscalls and add more
overhead.


>It must be something in the kernel. Likely vnode/FFS, but maybe at a lower 
>level (RAIDframe, scsipi, mfii), that's why I asked up to what level time 
>spent in the kernel is attributed to the user process.

The spend in a syscall is attributed to the process. But the
actual I/O is often deferred to kernel threads and handled in
interrupts. Interrupt time is not accounted to user processes.