Differential D10012

Reduce ARC fragmentaion threshold
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Authored by smh on Mar 15 2017, 12:40 PM.

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mav
avg
Commits
rS315449: Reduce ARC fragmentation threshold
Summary

As ZFS can request up to SPA_MAXBLOCKSIZE memory block e.g. during zfs recv, update the threshold at which we start agressive reclamation to use SPA_MAXBLOCKSIZE (16M) instead of the lower zfs_max_recordsize which defaults to 1M.

This was reported here:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194513

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rS FreeBSD src repository
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smh created this revision.Mar 15 2017, 12:40 PM
smh added a reviewer: mav.Mar 15 2017, 12:40 PM
mav accepted this revision.EditedMar 15 2017, 12:45 PM

I have no objections. It may be too aggressive if fragmentation was somehow caused not by ZFS, but any way I don't know any other place in system which would bother to do this, while I know other places that suffer quietly from fragmentation.

This revision is now accepted and ready to land.Mar 15 2017, 12:45 PM
smh added a reviewer: avg.Mar 17 2017, 12:14 PM
avg accepted this revision.Mar 17 2017, 12:22 PM
Closed by commit rS315449: Reduce ARC fragmentation threshold (authored by smh). · Explain WhyMar 17 2017, 12:35 PM
This revision was automatically updated to reflect the committed changes.

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head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c

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