Date: Sat, 16 Sep 2017 23:20:42 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 222377] ZFS ABD wasteful... Message-ID: <bug-222377-8@https.bugs.freebsd.org/bugzilla/>
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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: freebsd-bugs@FreeBSD.org Reporter: sean@chittenden.org 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.
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