On 06/01/2011 23:07, David Magda wrote:
On Jan 6, 2011, at 15:57, Nicolas Williams wrote:
Fletcher is faster than SHA-256, so I think that must be what you're
asking about: "can Fletcher+Verification be faster than
Sha256+NoVerification?" Or do you have some other goal?
Would running on recent T-series servers, which have have on-die crypto units,
help any in this regard?
The on chip SHA-256 implementation is not yet used see:
http://blogs.sun.com/darren/entry/improving_zfs_dedup_performance_via
"Note that the fix I integrated only uses a software implementation of
SHA256 on the T5120 (UltraSPARC T2) and is not (yet) using the on CPU
hardware implementation of SHA256. The reason for this is to do with
boot time availability of the Solaris Cryptographic Framework and the
need to have ZFS as the root filesystem."
Not yet changed it turns out to be quite complicated to fix due to very
early boot issues.
--
Darren J Moffat
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