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| author | Stefan Haberland <sth@linux.ibm.com> | 2026-08-05 13:15:58 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-08-05 06:31:07 -0600 |
| commit | e647f351da2c6601a3e280b5c3477421e981ca73 (patch) | |
| tree | e14aee236d48a6be674728458d0ec3ef44e7d4e8 | |
| parent | dc3e3f7306cb74066f231251602b1be5aaec7bd8 (diff) | |
| download | linux-e647f351da2c6601a3e280b5c3477421e981ca73.tar.gz linux-e647f351da2c6601a3e280b5c3477421e981ca73.zip | |
s390/dasd: Optimize max blocks per request for track alignment
With 4096-byte blocks a full ECKD track holds exactly 12 records. Lower
DASD_ECKD_MAX_BLOCKS from 190 to 180 so requests align to track
boundaries (15 full tracks); full-track I/O is more efficient than
partial-track writes, and 190 had no alignment significance and could
let a request cross a track boundary.
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20260805111612.1285190-6-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/s390/block/dasd_eckd.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index f9299bd184ba..763733bcc4d2 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -131,7 +131,7 @@ /* * Maximum number of blocks to be chained */ -#define DASD_ECKD_MAX_BLOCKS 190 +#define DASD_ECKD_MAX_BLOCKS 180 #define DASD_ECKD_MAX_BLOCKS_RAW 256 /***************************************************************************** |