Dear All, Any suggestions on the below point ?
Thanks in advance.. On Mon, May 30, 2011 at 10:53 AM, mani <[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]> wrote: > >> On Fri, May 27, 2011 at 8:29 AM, mani <[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 >> > >> > >> > _______________________________________________ >> > Kernelnewbies mailing list >> > [email protected] >> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > >> > >> >> >> >> -- >> Eduardo Silva >> http://edsiper.linuxchile.cl >> http://www.monkey-project.com >> > >
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