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Date: Thu, 12 Jul 2012 18:54:56 +0200
From: Frank Dittrich <frank_dittrich@...mail.com>
To: john-dev@...ts.openwall.com
Subject: Re: RAdmin, SIP speedup
On 07/12/2012 06:44 PM, Dhiru Kholia wrote:
> On Sun, Jul 8, 2012 at 11:00 AM, Solar Designer <solar@...nwall.com> wrote:
>> BTW, note that this is not a true 8-core machine (it's Bulldozer with
>> its 4 modules and 2 cores per module; also it reduces clock rate from
>> 4.0 GHz to 3.1 GHz or maybe slightly higher when under full load), so
>> the perfect speedup would be about 6x. Thus, 3x is "only" twice worse
>> than perfect.
>
> 4 modules * 2 cores / module = 8 cores. I don't understand why the
> perfect speedup is only 6x.
Probably that's why:
http://en.wikipedia.org/wiki/Bulldozer_%28microarchitecture%29#Process_technology_and_clock_frequency
Turbo Core 2 performance boost to increase clock frequency up to 500 MHz
with all threads active (for most workloads) and up to 1 GHz with the
half of the thread active, within the TDP limit.
Frank
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