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s390/dasd: Optimize max blocks per request for track alignment

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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>
This commit is contained in:
Stefan Haberland
2026-08-05 13:15:58 +02:00
committed by Jens Axboe
parent dc3e3f7306
commit e647f351da
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/block/dasd_eckd.h
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@@ -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
/*****************************************************************************