Messages in this thread | | | Date | Sun, 25 Nov 2007 21:12:59 -0800 | From | Andrew Morton <> | Subject | Re: [2.6 patch] make I/O schedulers non-modular |
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(cc's lovingly restored. Please do not do that)
On Mon, 26 Nov 2007 07:57:00 +0300 Al Boldi <a1426z@gawab.com> 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.
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