On 2023/8/17 06:36, Jens Axboe wrote:
On 8/16/23 3:46 PM, Qu Wenruo wrote:
Is that write back caching enabled?
Write back caching with volatile write cache? For your device, can you
do:
$ grep . /sys/block/$dev/queue/*
You didn't answer this one either.
Sorry, here is the output:
$ grep . /sys/block/vdb/queue/*
/sys/block/vdb/queue/add_random:0
/sys/block/vdb/queue/chunk_sectors:0
/sys/block/vdb/queue/dax:0
/sys/block/vdb/queue/discard_granularity:512
/sys/block/vdb/queue/discard_max_bytes:2147483136
/sys/block/vdb/queue/discard_max_hw_bytes:2147483136
/sys/block/vdb/queue/discard_zeroes_data:0
/sys/block/vdb/queue/dma_alignment:511
/sys/block/vdb/queue/fua:0
/sys/block/vdb/queue/hw_sector_size:512
/sys/block/vdb/queue/io_poll:0
/sys/block/vdb/queue/io_poll_delay:-1
/sys/block/vdb/queue/iostats:1
/sys/block/vdb/queue/logical_block_size:512
/sys/block/vdb/queue/max_discard_segments:1
/sys/block/vdb/queue/max_hw_sectors_kb:2147483647
/sys/block/vdb/queue/max_integrity_segments:0
/sys/block/vdb/queue/max_sectors_kb:1280
/sys/block/vdb/queue/max_segment_size:4294967295
/sys/block/vdb/queue/max_segments:254
/sys/block/vdb/queue/minimum_io_size:512
/sys/block/vdb/queue/nomerges:0
/sys/block/vdb/queue/nr_requests:256
/sys/block/vdb/queue/nr_zones:0
/sys/block/vdb/queue/optimal_io_size:0
/sys/block/vdb/queue/physical_block_size:512
/sys/block/vdb/queue/read_ahead_kb:128
/sys/block/vdb/queue/rotational:1
/sys/block/vdb/queue/rq_affinity:1
/sys/block/vdb/queue/scheduler:[none] mq-deadline kyber bfq
/sys/block/vdb/queue/stable_writes:0
/sys/block/vdb/queue/throttle_sample_time:100
/sys/block/vdb/queue/virt_boundary_mask:0
/sys/block/vdb/queue/wbt_lat_usec:75000
/sys/block/vdb/queue/write_cache:write back
/sys/block/vdb/queue/write_same_max_bytes:0
/sys/block/vdb/queue/write_zeroes_max_bytes:2147483136
/sys/block/vdb/queue/zone_append_max_bytes:0
/sys/block/vdb/queue/zone_write_granularity:0
/sys/block/vdb/queue/zoned:none
Thanks,
Qu
