Changes in block layer for IOScheduler Insertion selection

[Eduardo Silva]

On Fri, May 27, 2011 at 8:29 AM, mani <manishrma at gmail.com> wrote:
>
> Dear All,
>
> I am working on linux kernel 2.6.32.9 tegra NVIDIA board.
>
> I am getting ~8MBps speed of the Nand disk if i use hdparm
> hdparm -t /dev/mtdblock3
>
> i made changes in block layer of kernel as below:-
>
> block/blk-core.c
> static inline void add_request(struct request_queue *q, struct request *req)
> {
>         drive_stat_acct(req, 1);
>
>         /*
>          * elevator indicated where it wants this request to be
>          * inserted at elevator_merge time
>          */
>
>         __elv_add_request(q, req, ELEVATOR_INSERT_BACK, 0);
>         //__elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0);
> }
>
>

What are the results for read and write for both cases ?


> changed ELEVATOR_INSERT_SORT to ELEVATOR_INSERT_BACK
> it improves my NAND speed to 10MBps.
>
> I am using "noop" I/O scheduler.
>
> Will this change have any adverse effect in kernel ? or any other side
> effect as far as i am using only Nand no Hard disk.
>
>
> Thanks
> Mani
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>



-- 
Eduardo Silva
http://edsiper.linuxchile.cl
http://www.monkey-project.com