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a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=EIcjfB9IiI4px24ztqRk:22 a=RzqYyRu2LyB9E_pxa0QA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE4MDA3NCBTYWx0ZWRfXy/k5jd3Tdkn6 U8tkxj67dILWePJNas4lRV4pWtHgm7BJHVY9oXXk8A45Y2OlL/eNe2YVhGaDjvq4ZOSPxn7d7fV b/YIl55P5lrSzlCvY5rWkOoCHXHUPcb2LlKxrP/4eLar11tHepbv4KNNK1cpjny1vDvH3R1N6Vp umHa0y3Ccxqt/KJkMEVILKGPqAlPRtQ5cEYO/+Y9k6AGcqiYfRK8aHtnZZnqVDL6IZJDB9huwj9 wpPTipb5ahHkZKsi2DbCr42motMj+MqpQlzVwNnYx/q0xGjxKYwuB1A+HC8ItZVlp0ApDdgMI+k Pd8ulk0qhUyXAagIjhOBEiqkVyVvP4Z2Gy0M59SMqffK6fG/wcN/dgOhzXI+C4uh+pUHLG/KWiJ Sjiyf7vTi0BGAYm43r3IY2XPMpJh/2YrVA1GgXHhVJi7rcqFQsL+57Tyf7xlZCgHlvG3G+2vldW T/sZZnCZc9Ak31aPN2A== X-Proofpoint-GUID: VVXSMGdynY-GxFcFyyzHDfnY39fNFHoI X-Proofpoint-ORIG-GUID: VVXSMGdynY-GxFcFyyzHDfnY39fNFHoI On 18/03/2026 07:43, Ionut Nechita (Wind River) wrote: > Answer to John's question about blk_validate_limits() rounding: > blk_validate_limits() rounds optimal_io_size down to physical_block_size > (4096), but does NOT enforce that optimal_io_size is a multiple of > minimum_io_size (8192). So optimal_io_size=16773120 survives validation > unchanged — it is already a multiple of 4096. The mismatch only shows > up when mkfs.xfs divides optimal_io_size by minimum_io_size and expects > an integer result: 16773120 / 8192 = 2047.5, giving swidth=4095 and > sunit=2, with 4095 % 2 != 0. thanks for the info. I feel that that io_opt should be a multiple of the io_min and we should enforce it in blk queue limits validation, but that can mask problems like you have seen.