linux/drivers/s390/block
Stefan Haberland 3284da34a8 s390/dasd: reduce the default queue depth and nr of hardware queues
Reduce the default values for the number of hardware queues and queue depth
to significantly reduce the memory footprint of a DASD device.
The memory consumption per DASD device reduces from approximately 40MB to
approximately 1.5MB.

This is necessary to build systems with a large number of DASD devices and
a reasonable amount of memory.
Performance measurements showed that good performance results are possible
with the new default values even on systems with lots of CPUs and lots of
alias devices.

Fixes: e443343e50 ("s390/dasd: blk-mq conversion")
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-07-02 11:22:41 +02:00
..
dasd_3990_erp.c s390/dasd: configurable IFCC handling 2018-02-22 15:31:23 +01:00
dasd_alias.c s390/dasd: only use preallocated requests 2018-06-12 15:14:31 +02:00
dasd_devmap.c s390/dasd: configurable IFCC handling 2018-02-22 15:31:23 +01:00
dasd_diag.c s390/dasd: move dasd_ccw_req to per request data 2018-06-12 15:14:19 +02:00
dasd_diag.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dasd_eckd.c s390/dasd: move dasd_ccw_req to per request data 2018-06-12 15:14:19 +02:00
dasd_eckd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dasd_eer.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2018-06-19 07:44:51 +09:00
dasd_erp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dasd_fba.c s390/dasd: move dasd_ccw_req to per request data 2018-06-12 15:14:19 +02:00
dasd_fba.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dasd_genhd.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dasd_int.h s390/dasd: reduce the default queue depth and nr of hardware queues 2018-07-02 11:22:41 +02:00
dasd_ioctl.c compat: Move compat_timespec/ timeval to compat_time.h 2018-04-19 13:29:54 +02:00
dasd_proc.c proc: introduce proc_create_seq{,_data} 2018-05-16 07:23:35 +02:00
dasd.c s390/dasd: reduce the default queue depth and nr of hardware queues 2018-07-02 11:22:41 +02:00
dcssblk.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
Kconfig dax: introduce CONFIG_DAX_DRIVER 2018-04-03 05:41:19 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scm_blk.c block: Use blk_queue_flag_*() in drivers instead of queue_flag_*() 2018-03-08 14:13:48 -07:00
scm_blk.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
scm_drv.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xpram.c block: Use blk_queue_flag_*() in drivers instead of queue_flag_*() 2018-03-08 14:13:48 -07:00