misc/178467: Optimized Checksum Code for ZFS

[Jason Keller]

>Number:         178467
>Category:       misc
>Synopsis:       Optimized Checksum Code for ZFS
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 09 21:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Jason Keller
>Release:        9.1
>Organization:
BBI International
>Environment:
FreeBSD chewy 9.1-RELEASE-p3 FreeBSD 9.1-RELEASE-p3 #0: Mon Apr 29 18:27:25 UTC 2013     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
This isn't so much a problem as it is an RFE.  Basically, the SHA256 checksum code within ZFS looks like it could use a little helping hand.  On my limited testing, it would appear that Solaris 11 has at least a 20-25% edge in efficiency when doing SHA256 checksumming for ZFS.  IANAP, but it would be extremely nice to be able to have the same (or better) efficiency for ZFS on FreeBSD.  I have not done specific testing with Fletcher4, but that also seemed to be slightly better tuned in Solaris 11 as well.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: