Re: [Lsf10-pc] [ATTEND] Want to attend LSF 2010

[Chris Mason <chris.mason@oracle.com>]

On Thu, Jul 01, 2010 at 02:10:06PM -0400, Ric Wheeler wrote:
> On 07/01/2010 02:04 PM, Vivek Goyal wrote:
> > Resending this mail. This time also CCing linux-scsi mailing list. Sorry
> > for the duplicate copy.
> >
> > Hi,
> >
> > I wanted to attend LSF 2010. Sepcifically I was interested in discussing
> > couple of things.
> >
> > - CFQ performance issues on higher end storage
> >          - Deadline outperforms CFQ on higher end storage (storage arrays
> >            and also on host based hardware RAID). I was wondering if there
> >            is a way to fix it or it is just design limitation. In the past
> >            Jens had mentioned that he wants to get rid of deadline also and
> >            be replaced with CFQ. Are we still targeting that and if yes,
> >            how to achieve that (some kind of auto tuning).
> >
> > - Max bandwidth IO controller
> >          - A basic proportional weight controller (blkio) based off CFQ is
> >            now in. Now there is also a need to implement throttling/max
> >            bandwidth controller. Wanted to get some ideas on how to go
> >            go about it and what is the best place to impement it. Implement
> >            it in CFQ or a new device mapper target or something else.
> >
> > Thanks
> > Vivek
> >
> 
> Thanks Vivek,
> 
> I know that this IO scheduling issue has been a hot issue for us in our 
> performance testing. We would love to figure out how to get CFQ to displace 
> deadline totally and definitely it would be very interesting to have a 
> conversation around what needs done/what can be done.
> 

I'll second that...one scheduler to rule them all.

-chris