Date: Tue, 18 Apr 2006 20:10:15 +0100 From: Bruce M Simpson <bms@spc.org> To: Dave Cornejo <dave@dogwood.com> Cc: freebsd-net@freebsd.org Subject: Re: crypto accelerators Message-ID: <20060418191015.GE28496@spc.org> In-Reply-To: <200604180244.k3I2icZj076600@white.dogwood.com> References: <200604180244.k3I2icZj076600@white.dogwood.com>
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On Mon, Apr 17, 2006 at 04:44:38PM -1000, Dave Cornejo wrote: > So the question is whether these cards, regardless of their affect on > throughput, increase usable CPU cycles? I have several Soekris 1401 > cards and am wondering if there would be any point to putting them > into some machines that provide logins over ssh. These machines are > generally pretty good spec, 2.4GHz+, 1GB RAM, Intel MBs, mostly > on-board peripherals. Given that spec of machine, I don't see that a hardware cipher would offer much improvement -- and some of the available crypto accelerators don't perform Diffie-Helmann or AES, some do. I myself have a ubsec(4) card, and even when I hacked OpenSSH to use OpenSSL engine support by default (with someone else's patch), I didn't see that much improvement (even when I forced the use of MD5, RSA and 3DES). I could be wrong though - the above is qualitative not quantitative. Regards, BMS
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