I am using squashfs filesystem. So i am more concern with the read speed.
whereas below are the details
read speed write speed
ELEVATOR_INSERT_SORT 8 MBps 5MBps
ELEVATOR_INSERT_BACK 10 MBps 7.2MBps
used the following command for measurement for both the cases.
reading
hdparm -t /dev/mtdblock3
writing
dd if=/dev/zero of=/dev/mtd3 bs=4096 count=100k
As of now everything is working fine with those changes
but i am worried if these changes would have any adverse effect anywhere ?
Thanks.
On Fri, May 27, 2011 at 8:37 PM, Eduardo Silva <edsiper@xxxxxxxxx> wrote:
On Fri, May 27, 2011 at 8:29 AM, mani <manishrma@xxxxxxxxx> wrote:What are the results for read and write for both cases ?
>
> 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
>
>
> Kernelnewbies mailing list
> Kernelnewbies@xxxxxxxxxxxxxxxxx
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
--
Eduardo Silva
http://edsiper.linuxchile.cl
http://www.monkey-project.com
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