Date: Mon, 21 Oct 2013 18:45:02 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: John-Mark Gurney <jmg@funkthat.com> 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: <37850.1382381102@critter.freebsd.dk> In-Reply-To: <20131021184310.GZ56872@funkthat.com> 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> <20131021184310.GZ56872@funkthat.com>
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In message <20131021184310.GZ56872@funkthat.com>, John-Mark Gurney writes: >Poul-Henning Kamp wrote this message on Mon, Oct 21, 2013 at 18:32 +0000: >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... Only for very large requests that can amortize the considerable setup overhead. Either way, we do *not* want the heuristics to guess this spread out over every and all modules which need crypto services. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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