https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222377
Bug ID: 222377
Summary: ZFS ABD wasteful...
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 186440
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186440&action=edit
ABD chunk size 1K
ABD was developed by Delphix and spent most of its life in testing with a value
of 1024. Late in the review process over at OpenZFS the value was bumped to 4K
under the auspices of "page-aligned memory allocations perform better,"[1]
which is frequently true, however under production workloads we have found this
to be very wasteful. The original 1K value should be restored and pushed
upstream into OpenZFS. This change has already been made in Joyent's branch of
Illumos[2].
https://github.com/openzfs/openzfs/pull/326#issuecomment-291223116
https://github.com/joyent/illumos-joyent/commit/09443b7960ae0f0a3ddcf56d1879e006c2790316
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
[email protected] mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-bugs
To unsubscribe, send any mail to "[email protected]"
