On Fri, May 27, 2011 at 8:29 AM, mani <manishrma@xxxxxxxxx> 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
>
>
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>
>
--
Eduardo Silva
http://edsiper.linuxchile.cl
http://www.monkey-project.com
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