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Full Discussion: Increasing total data size per file system request for block drivers
Operating Systems Linux Increasing total data size per file system request for block drivers Post 302452803 by amio on Monday 13th of September 2010 06:14:28 AM
Old 09-13-2010
Question Increasing total data size per file system request for block drivers
Hi All,

I am writing a block driver for a 2GB SD card where i get the total amount of data per request as follows:

Code:
struct request *req;
uint card_addr,total_bytes;
struct request_queue *rq = BlkDev->queue;
 
req = elv_next_request(rq);
..
..
card_addr = req->sector*512;
total_bytes = req->current_nr_sectors*512;

Here, the total_bytes i.e the amount of data per request sent/received by file system is always <= 4KB.Hence it affects the card's read/write performance for large file size as the process needs to be repeated for every 4KB.

Is it like, the linux file system block size is limited to 4KB?
Is there any way to increase the transfer size per request?

Thanks in advance.
-amio
Last edited by pludi; 09-13-2010 at 07:42 AM..
 

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LEARN ABOUT DEBIAN

tapset::iosched

TAPSET::IOSCHED(3stap)													    TAPSET::IOSCHED(3stap)

NAME

       tapset::iosched - systemtap IO scheduler probe points

DESCRIPTION

       This family of probe points is used to probe the IO scheduler activities.  It contains the following probe points:

       ioscheduler.elv_next_request
	      Fires when retrieves a request from request queue

	      Arguments:

	      elevator_name
		The elevator name

       ioscheduler.elv_next_request.return
	      Fires when return from retrieving a request

	      Arguments:

	      req
		Address of the request

	      req_flags
		request flags

	      disk_major
		disk major number of the request

	      disk_minor
		disk minor number of the request

       ioscheduler.elv_add_request
	      Fires when add a request into request queue

	      Arguments:

	      elevator_name
		The elevator name

	      req
		Address of the request

	      req_flags
		request flags

	      disk_major
		disk major number of the request

	      disk_minor
		disk minor number of the request

       ioscheduler.elv_completed_request
	      Fires when a request is completed

	      Arguments:

	      elevator_name
		The elevator name

	      req
		Address of the request

	      req_flags
		request flags

	      disk_major
		disk major number of the request

	      disk_minor
		disk minor number of the request

SEE ALSO

       stap(1), stapprobes(3stap)

IBM
															    TAPSET::IOSCHED(3stap)
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