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

[Jens Axboe <jaxboe@fusionio.com>]

On 01/07/10 20.40, Chris Mason wrote:
> 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.

Agreed :-)

-- 
Jens Axboe