>On a RiscPC with a 233MHz StrongARM and 78MB of core memory, the
>`Building Dependency Tree' stage of Debian's `apt-get' progresses
>/significantly/ slower than on a Netwinder with 64MB, for the same
>sources.list set. Can anyone imagine why?
Well, that part of apt-get doesn't touch the disk. My guess is that it's
memory bound; the RiscPC uses FPM (or is it EDO?) RAM on a nominal 16MHz bus
and the NetWinder uses SDRAM on what I assume is a 66MHz bus. So any time you
have to go to main memory you will lose out. SA-110 runs the core from bus
clock any time the bus is in use (not just when the core is talking to it) so
you may be spending a lot of your time doing slow cycles.
For processes that are actually compute bound and running from CCLK the
NetWinder will still be faster but probably only by 50% or so.
Bizarrely, apt-get seems to make a huge number of calls to gettimeofday(),
which is unlikely to be helping its performance on either platform.
p.
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