Changes in block layer for IOScheduler Insertion selection

[mani <manishrma@xxxxxxxxx>]

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);
}


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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