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Re: [hybi] Upgrade Mechanism and HasMat (was Re: Extensibility mechanisms?)

Dave Cridland <dave@cridland.net> Thu, 22 July 2010 14:25 UTC

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Date: Thu, 22 Jul 2010 15:25:30 +0100
From: Dave Cridland <dave@cridland.net>
To: Dave Cridland <dave@cridland.net>, Willy Tarreau <w@1wt.eu>, "Roy T. Fielding" <fielding@gbiv.com>, Server-Initiated HTTP <hybi@ietf.org>, Salvatore Loreto <salvatore.loreto@ericsson.com>
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Subject: Re: [hybi] Upgrade Mechanism and HasMat (was Re: Extensibility mechanisms?)
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On Thu Jul 22 15:22:27 2010, Dave Cridland wrote:
> On Thu Jul 22 13:33:17 2010, Willy Tarreau wrote:
>> Nice, thanks for feeding some useful info here ! So we can assume
>> that a correctly sized server will be able to compute at least 2
>> million hashes a second, which translates into less than 1% CPU
>> overhead at 20000 connections per second.
>> 
>> 
> Well, perhaps a bit worse than that - say 1 million per second, and  
>  therefore 2%.

Harrumph. I misread my own figures.

Given 7,765,276 over 3.0 seconds on one core, my machine can do  
10,353,701 hashes per second using all four cores, and therefore  
20,000 connections per second equates to an overhead (due to MD5) of  
roughly 0.2%.

But what's a factor of ten between friends?

Dave.
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