From mboxrd@z Thu Jan 1 00:00:00 1970 From: edsiper@gmail.com (Eduardo Silva) Date: Fri, 27 May 2011 11:07:50 -0400 Subject: Changes in block layer for IOScheduler Insertion selection In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On Fri, May 27, 2011 at 8:29 AM, mani 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 > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- Eduardo Silva http://edsiper.linuxchile.cl http://www.monkey-project.com