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Fri, 31 Jul 2026 15:38:59 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 31 Jul 2026 15:38:59 +0000 (GMT) From: Stefan Haberland To: linux-s390@vger.kernel.org Cc: Jan Hoeppner , Eduard Shishkin Subject: [PATCH v5 03/17] s390/dasd: Optimize max blocks per request for track alignment Date: Fri, 31 Jul 2026 17:38:28 +0200 Message-ID: <20260731153842.1729627-4-sth@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260731153842.1729627-1-sth@linux.ibm.com> References: <20260731153842.1729627-1-sth@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 2rIyTKxlWPwFVbKmz7OG8L4uGQvcIEZx X-Proofpoint-ORIG-GUID: 2rIyTKxlWPwFVbKmz7OG8L4uGQvcIEZx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDExNiBTYWx0ZWRfX1q0AwFo97Nul tsjrm8vjPa/eHpIRurvVSbikQE01UmxJq1CRX6LPEeEPSi8rVPOVIViYGWP146ulyZ7ADNY7O+t /IvtJbBd0vdAw+h+0xp0Etyn75F8bjdft/dx4MKkJFMgZonBF3bEYfwfe8oOyNGIKLDtbYpHtlV kEoXPOHDofCKkuPdiL5ILXTUItrBIHafqBqjZOFX13ya6K1pcv75cHGNc6MsiBbAHKWBoE2VFZh 4MYjqK07R+xQtchFD5QmZFSU9IWydysXnu482ASYCjvSnJu/7cvlbN6wD0lyq21yQwyQWNvzq/H R5U+NTj+dopuqsL+XfFYj75k6gGkXuRV0uP54wZgVrZwHAcP0uHKJKfNx5aPN4M6ef2//kl3y1/ +PJKtUjy2jhYdZ/fNc2UJVqmEyKxXmekdDxISSf8fpl/CPf5SB+Rnib2idzTuWejU/DorlkA4Ef zKEfpPJjt9AcvM6qSuw== X-Authority-Analysis: v=2.4 cv=SKFykuvH c=1 sm=1 tr=0 ts=6a6cc198 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=8f17mpASHZ0i51vZi0YA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDExNiBTYWx0ZWRfXzveqZdNt1cZZ CnWZCjpfEn75P+hqwywZ+GNTWTtpouWN+XScCUUL0wWkRPmohFjySqzClqUqkI7P9lvoR9Jo37O gdwdUhVSOn3mcLM2RbMBtxAAxdySHq0= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-31_04,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310116 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 Signed-off-by: Stefan Haberland --- 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