Bug 218043 - ZFS ARC hit regression
Summary: ZFS ARC hit regression
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 11.0-STABLE
Hardware: Any Any
: --- Affects Many People
Assignee: Alexander Motin
Keywords: regression
Depends on:
Reported: 2017-03-23 15:24 UTC by slw
Modified: 2017-07-27 19:33 UTC (History)
3 users (show)

See Also:


Note You need to log in before you can comment on or make changes to this bug.
Description slw 2017-03-23 15:24:37 UTC
After base r307265 (MFC base r305323) ZFS ARC caused regresion for hit ratio of data and cused about x220 rise of metadata request ratio.

System w/ reverted base r307265:

   ARC demand metadata hits:    27     30     29     29
 ARC demand metadata misses:     0      0      0      0

System w/ applied base r307265:

   ARC demand metadata hits:  6619   6773   6680   6643
 ARC demand metadata misses:     0      0      0      0

I mean requested (and hited) metadata evict data from ZFS and give regression of data hit ratio.
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2017-03-23 22:18:02 UTC
Over to committer of r307265.