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SubjectRe: 2.6 ide i/o performance
Date
Vitalis Tiknius <vt@vt.fermentas.lt> writes:

> i simultaneously burned (audio mode, without scsi emulation) and ripped cd's
> under 2.6.0-test2-mm2. devices are:
>
> ../ide/host0/bus1/target0/lun0/cd (Teac CD-W552E)
> ../ide/host0/bus1/target1/lun0/cd (Teac DV-516E).
>
> mobo is Intel 875. software is k3b-0.9, cdrtools-2.01_alpha18, grip-3.1.1, and
> cdparanoia-3.9.8 with all paranoia options on.
>
> when burning and ripping are performed separately, their speeds are approx.
> 42x and 6.3x. when simultaneously, 12x and 1.6x with no options touched.
>
> although devices are on the same controller (my first controller is
> SATA) and on the same bus, i'd rather expect linear and not almost
> square-law throughput regression observed. are the things expected
> to go this way, or there is some room for optimizations, etc.?

The first thing to do is to use separate cables for those devices, and
see if it helps.

--
Måns Rullgård
mru@users.sf.net

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