IO To IDE Blocking In 5.1
Mark Kirkwood
markir at paradise.net.nz
Thu Sep 4 00:43:56 PDT 2003
Poor form to anwser my own question but ....
I removed and inspected the IDE cables... found one with some damage - I
suspect this is the
cause.
Happend to get a Promise TX2000 raid card yesterday , so I reinstalled
(+ new cables).
Retesting the scenario finds that iostat is not blocked.
regards
Mark
P.s : Still seeing loss of 2 processor scaling where *any* io is
involved, but I will study this some more and post to smp if cant
understand it (I wonder if its something to do with running 2 copies of
the *same* binary).
Mark Kirkwood wrote:
> .....
> iostat blocks until the process is completed. If I start iostat
> *first*, then it does not block, and
> I can see the io activity generated by the process when it starts.
>
> I am running the SMP kernel, but can reproduce this using GENERIC.
>
> Any ideas ?
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