Date: Mon, 21 Oct 2013 11:43:10 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Andre Oppermann <andre@freebsd.org>, Mark R V Murray <mark@grondar.org>, freebsd-arch@freebsd.org Subject: Re: always load aesni or load it when cpu supports it Message-ID: <20131021184310.GZ56872@funkthat.com> In-Reply-To: <37748.1382380333@critter.freebsd.dk> References: <20131020070022.GP56872@funkthat.com> <423D921D-6CE5-49D9-BCED-AB14EB236800@grondar.org> <20131020161634.GQ56872@funkthat.com> <5264F074.4010607@freebsd.org> <20131021164034.GU56872@funkthat.com> <37693.1382379728@critter.freebsd.dk> <20131021182834.GX56872@funkthat.com> <37748.1382380333@critter.freebsd.dk>
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Poul-Henning Kamp wrote this message on Mon, Oct 21, 2013 at 18:32 +0000:
> In message <20131021182834.GX56872@funkthat.com>, John-Mark Gurney writes:
>
> >If you're on a slow system (embeded x86 or arm) that has an AES
> >accelerator, you really want to be using your accelerator than wasting
> >your cpu cycles on large blockes of AES...
>
> First, as I said in my previous email: I have still to see "distant"
> crypto accelerator do any good if you have idle CPU, even on a soekris 4801.
Also depends upon the crypto mode you are using... If you're using
CBC encrypt, then you'd need a very fancy accelerator to out perform
a CPU, but in other modes like XTS or CTR, an accelerator can/will out
perform the CPU...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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