add vfs_zfs.abd_chunk_size tunable
authoravg <avg@FreeBSD.org>
Wed, 20 Sep 2017 08:36:31 +0000 (08:36 +0000)
committeravg <avg@FreeBSD.org>
Wed, 20 Sep 2017 08:36:31 +0000 (08:36 +0000)
commit52d97ef7c7841c679cd8086a678fa40666d6a59f
tree7714e8c0991197570c83a70823fc3eb5027731bd
parent0697f6613b255c1d2db00bceb47b8428caf84695
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
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c