From: Stefan Haberland <sth@linux.ibm.com>
To: linux-s390@vger.kernel.org
Cc: Jan Hoeppner <hoeppner@linux.ibm.com>,
Eduard Shishkin <edward6@linux.ibm.com>
Subject: [PATCH v3 01/13] s390/dasd: Optimize max blocks per request for track alignment
Date: Thu, 23 Jul 2026 15:47:31 +0200 [thread overview]
Message-ID: <20260723134743.672413-2-sth@linux.ibm.com> (raw)
In-Reply-To: <20260723134743.672413-1-sth@linux.ibm.com>
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.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
drivers/s390/block/dasd_eckd.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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
/*****************************************************************************
--
2.53.0
next prev parent reply other threads:[~2026-07-23 13:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 13:47 [PATCH v3 00/13] s390/dasd: ESE thin-provisioning performance improvements Stefan Haberland
2026-07-23 13:47 ` Stefan Haberland [this message]
2026-07-23 13:58 ` [PATCH v3 01/13] s390/dasd: Optimize max blocks per request for track alignment sashiko-bot
2026-07-23 13:47 ` [PATCH v3 02/13] s390/dasd: Add infrastructure for ESE full-track write Stefan Haberland
2026-07-23 14:11 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 03/13] s390/dasd: Add range-based format-track collision detection Stefan Haberland
2026-07-23 14:13 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 04/13] s390/dasd: Extend prepare_itcw() to support WRITE_FULL_TRACK Stefan Haberland
2026-07-23 14:25 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 05/13] s390/dasd: Add dasd_eckd_build_cp_tpm_writefulltrack() Stefan Haberland
2026-07-23 14:14 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 06/13] s390/dasd: Use WRITE_FULL_TRACK in ESE format handler Stefan Haberland
2026-07-23 14:13 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 07/13] s390/dasd: Add full_track_bias sysfs attribute to control fulltrack write mode Stefan Haberland
2026-07-23 14:16 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 08/13] s390/dasd: Derive adaptive ESE fulltrack heuristic from ft_bias Stefan Haberland
2026-07-23 14:09 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 09/13] s390/dasd: Stamp a format label into newly formatted volumes Stefan Haberland
2026-07-23 14:09 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 10/13] s390/dasd: Detect ESE volumes from the on-disk format label Stefan Haberland
2026-07-23 14:19 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 11/13] s390/dasd: Report ESE capability and format mode at device online Stefan Haberland
2026-07-23 14:14 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 12/13] s390/dasd: Re-enable discard support for ESE volumes Stefan Haberland
2026-07-23 14:30 ` sashiko-bot
2026-07-23 13:47 ` [PATCH v3 13/13] s390/dasd: Read cached unit address and LSS in the CCW build path Stefan Haberland
2026-07-23 14:35 ` sashiko-bot
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