Hi, > > Wang, > > > scsi optimal_io_size changed from 0 on kernel 6.6, to > > 16773120(32760*512, 4095*4096) on kernel 6.12/6.16 > > Peculiar value. Please share the output of: It seems the valule of 'shost->opt_sectors' 'dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT' that means the optimal_io_size of scsi host(hba). > > # sg_readcap -l /dev/sdN > > and > > # sg_vpd -p bl /dev/sdN > # lsscsi [0:0:0:0] disk HITACHI HUSMH842 CLAR100 C292 /dev/sda [0:0:1:0] disk ATA INTEL SSDSC2BB48 0121 /dev/sdb [5:0:0:0] cd/dvd PLDS DVD-ROM DS-8D9SH UD11 /dev/sr0 # sg_readcap -l /dev/sda Read Capacity results: Protection: prot_en=1, p_type=1, p_i_exponent=0 [type 2 protection] Logical block provisioning: lbpme=1, lbprz=1 Last LBA=195371567 (0xba5222f), Number of logical blocks=195371568 Logical block length=512 bytes Logical blocks per physical block exponent=3 [so physical block length=4096 bytes] Lowest aligned LBA=0 Hence: Device size: 100030242816 bytes, 95396.3 MiB, 100.03 GB # sg_readcap -l /dev/sda Read Capacity results: Protection: prot_en=1, p_type=1, p_i_exponent=0 [type 2 protection] Logical block provisioning: lbpme=1, lbprz=1 Last LBA=195371567 (0xba5222f), Number of logical blocks=195371568 Logical block length=512 bytes Logical blocks per physical block exponent=3 [so physical block length=4096 bytes] Lowest aligned LBA=0 Hence: Device size: 100030242816 bytes, 95396.3 MiB, 100.03 GB # Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2025/06/25
