Want to attend LSF 2010

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

Quoted 23 lines · Vivek Goyal

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.

Quoted 3 lines

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.

Quoted 30 lines · Ric Wheeler

Quoted 23 lines · Vivek Goyal

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.

Quoted 3 lines

Thanks
Vivek

Thanks Vivek,

Quoted 5 lines

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.