1.5.2 usage impact

Developer discussions.

Re: 1.5.2 usage impact

Postby haer22 » Wed Jun 08, 2016 10:39 am

I'm going for skein when I will re-create my quirky 15TB pool this evening. So I will use your config

tangles wrote:so, should we suggest a "speed" config/option in the documentation of:
Code: Select all
 sudo zpool create -f -o ashift=12 -O compression=skein -O casesensitivity=insensitive -O atime=off -O normalization=formD tank mirror disk3 disk4


I saw that edon-R has some issues...
https://www.listbox.com/member/archive/ ... FD97918BF/

Mr Lundy? yr expertise please... :geek: :D
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Re: 1.5.2 usage impact

Postby lundman » Wed Jun 08, 2016 10:40 pm

First comment about SIMD, we are somewhat lucky that in XNU kernel we can mix SIMD with regular without any hoop-jumping, so we can vectorise our algorithms at any time. None of them are at the moment though. I was looking at the fletcher avx2 code from ZOL, but realised my hardware does not have AVX2 so I am unable to test it anyway.

As for EDON-R, the cryptographical concerns are probably valid, but it is only used as checksum in ZFS, so worries about collisions are probably not as drastic. But who knows.
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Re: 1.5.2 usage impact

Postby haer22 » Thu Jun 09, 2016 1:45 pm

And i guess you meant "checksum=skein" instead of "compression=skein".

tangles wrote:so, should we suggest a "speed" config/option in the documentation of:
Code: Select all
 sudo zpool create -f -o ashift=12 -O compression=skein -O casesensitivity=insensitive -O atime=off -O normalization=formD tank mirror disk3 disk4


I saw that edon-R has some issues...
https://www.listbox.com/member/archive/ ... FD97918BF/

Mr Lundy? yr expertise please... :geek: :D
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Posts: 112
Joined: Sun Mar 23, 2014 2:13 am

Re: 1.5.2 usage impact

Postby tangles » Tue Jun 14, 2016 4:57 am

ah... yep... :oops:

Did have a pint in my hand at the time when I hit the submit button.

Might have something to do with it :roll:
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