On Mon, Jul 30, 2007 at 05:54:11PM +0200, Simon 'corecode' Schubert wrote: > 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.
there's an implementation of anticipatory io scheduler for freebsd 4.3 it might be quite easily portable to dfly http://www.cs.rice.edu/~ssiyer/r/antsched/ roman
