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add vfs_zfs.abd_chunk_size tunable

Description

add vfs_zfs.abd_chunk_size tunable

It is reported that the default value of 4KB results in a substantial
memory use overhead (at least, on some configurations). Using 1KB seems
to reduce the overhead significantly.

PR: 222377
Reported by: Sean Chittenden <sean@chittenden.org>
MFC after: 1 week

Details

Provenance
avgAuthored on
Parents
rS323796: fix memory leak in g_bio zone introduced in r320452, another ABD fallout
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