poor performance on big machine

Simon 'corecode' Schubert corecode at fs.ei.tum.de
Mon Jul 30 08:58:06 PDT 2007

Simon 'corecode' Schubert wrote:
more data:

- irq21 seems to always carry about half of the number of interrupts 
atapci1 is carrying.

- over large periods, the % busy of ad6 is at 100%, servicing maybe 350 
or even 800 requests/sec.  I/O speed then is around 3-10 MB/sec.  this 
is with 1.10 and SMP.  I'll try compiling a old-ata kernel now.
Okay, old ata kernel does not help.  I'd even be inclined to say "looks even worse", but that might be subjective.  We definitely need an I/O scheduler and a low level disk scheduler.


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