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- Make /sys/block/<dev>/queue/discard_max_bytes writeable, by me. Most
devices have huge trim limits, which can cause nasty latencies when
deleting files. Enable the admin to configure the size down. We will
look into having a more sane default instead of UINT_MAX sectors.
When attempting to trim a large volume, the block core submitting the discards as enormous requests taking inordinate amounts of time each to complete usually results in many 120 second stall warnings in my kernel logs. Being able to request the block core split the requests into smaller, reasonable-time chunks will remove this logspam and hopefully improve performance also.
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