(cc's lovingly restored. Please do not do that)
On Mon, 26 Nov 2007 07:57:00 +0300 Al Boldi <[email protected]> wrote:
> Jens Axboe wrote:
> > On Sun, Nov 25 2007, Adrian Bunk wrote:
> > > Is there any technical reason why we need 4 different schedulers at all?
> >
> > Until we have the perfect scheduler :-)
> >
> > With some hard work and testing, we should be able to get rid of 'as'.
> > It still beats cfq for some of the workloads that deadline is good at,
> > so not quite yet.
> >
> > > I have the gut feeling that the usual thing happens and people e.g. not
> > > report some cfq problems because as works for them...
> >
> > There's always a risk with "duplicate", like several drivers for the
> > same hardware. I'm not disputing that.
>
> Actually, both 'cfq' and 'as' are broken, and have been repeatedly reported
> as such. Deadline is the only one that currently looks sane, and seems like
> a good starting point for a more involved iosched. But keep in mind, the
> fact that 'cfq' and 'as' are broken may also point to a lower-level block-io
> problem. So, incrementally improving deadline may help discovering the
> problems both 'cfq' and 'as' are plagued with.
>
Sorry, but these are vague and unuseful assertions.
Please send bug reports, preferably with testcases which developers can use
when fixing the bugs.
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