Re: poor performance on big machine

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

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.

cheers
 simon