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Date: Sat, 10 Sep 2005 22:24:19 -0400
From: Nick Evans <nevans@syphen.net>
To: "ke.han" <ke.han@redstarling.com>
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Cc: freebsd-geom <freebsd-geom@freebsd.org>
Subject: Re: GELI hardware performance.
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On Sun, 11 Sep 2005 08:56:26 +0800
"ke.han" <ke.han@redstarling.com> wrote:

> Thanks for the comparison.  As a newcomer to both GELI and gbde, it 
> would be niced to know how these numbers compare to no encryption on
> the same hardware.  How hard would it be to run these performance
> tests on the same hardware with no GELI? 
> It seems that for drives that put through  over 100Mbs that your
> results of around 14 to 27 Mbs (block output) are pretty low.  Am I
> readin the numbers wrong? comparing apples to oranges?
> any help in my understanding is appreciated as I'm trying to decide
> how to solve a new server setup.
> thanks, ke han
> 

No GELI, same disk:

Per char output: 45967 K/sec, 82.2% CPU
Block output: 56019 K/sec, 35.9% CPU
Rewrite: 15833 K/sec, 10.5% CPU

Per char input: 31412 K/sec, 60.8% CPU
Block input: 40143 K/sec, 17.5% CPU

Seeks/sec: 853.2, 5.2% CPU

Looks like ~50-85% of the original performance when hardware crypto is
used. Not bad considering.