Messages in this thread | | | From | Al Boldi <> | Subject | Re: [2.6 patch] make I/O schedulers non-modular | Date | Mon, 26 Nov 2007 08:28:41 +0300 |
| |
Andrew Morton wrote: > (cc's lovingly restored. Please do not do that)
Thanks! I'm replying off list.
> 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. > > Please send bug reports, preferably with testcases which developers can > use when fixing the bugs.
http://bugzilla.kernel.org/show_bug.cgi?id=5900
Thanks again!
-- Al
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |