Re: [Cfrg] Timing of libsodium, curve25519-donna, MSR ECCLib, and openssl-master

James Cloos <cloos@jhcloos.com> Mon, 18 August 2014 05:49 UTC

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From: James Cloos <cloos@jhcloos.com>
To: Andrey Jivsov <crypto@brainhub.org>
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References: <53F0010B.6080101@brainhub.org> <CD159876-F061-4EB8-B1DC-FAB8E4798E26@shiftleft.org> <53F108CF.4040704@brainhub.org>
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Date: Mon, 18 Aug 2014 01:47:51 -0400
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Subject: Re: [Cfrg] Timing of libsodium, curve25519-donna, MSR ECCLib, and openssl-master
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>>>>> "AJ" == Andrey Jivsov <crypto@brainhub.org>; writes:

>> Do you know if TurboBoost was on?  That CPU can boost to 3.7 GHz, so the cycle counts could be 12% different one way or another.

AJ> I checked my BIOS setting. It says "Intel HT Technology" Not Supported.

Turboboost != hyperthreading.

cpufreq-info(1) should tell you whether turboboost is in use.

-JimC
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James Cloos <cloos@jhcloos.com>;         OpenPGP: 0x997A9F17ED7DAEA6