On 06/02/2011 05:41 AM, mani wrote:
Dear All,
Any suggestions on the below point ?
have you tried different benchmarks?
This can give you an idea of the impact. It seems that up to now, you've
only executed sequential read and write access by one process.
Personally I use the fio benchmark. For flash file systems, David Wagner
from Free Electrons developed a benchmarksuite. Maybe it would be worse
having a look on it.
Best regards,
Matthias Brugger
Thanks in advance..
On Mon, May 30, 2011 at 10:53 AM, mani <[email protected]
<mailto:[email protected]>> wrote:
Dear Eduardo,
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 <[email protected]
<mailto:[email protected]>> wrote:
On Fri, May 27, 2011 at 8:29 AM, mani <[email protected]
<mailto:[email protected]>> 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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> [email protected]
<mailto:[email protected]>
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
--
Eduardo Silva
http://edsiper.linuxchile.cl
http://www.monkey-project.com
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