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Re: [AVTCORE] Comments on draft-lennox-rtcweb-rtp-media-type-mux-00

Harald Alvestrand <harald@alvestrand.no> Fri, 11 November 2011 09:32 UTC

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Date: Fri, 11 Nov 2011 10:32:37 +0100
From: Harald Alvestrand <harald@alvestrand.no>
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Cc: Jonathan Lennox <jonathan@vidyo.com>, Jonathan Rosenberg <jonathan.rosenberg@skype.net>, IETF AVTCore WG <avt@ietf.org>
Subject: Re: [AVTCORE] Comments on draft-lennox-rtcweb-rtp-media-type-mux-00
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On 11/10/2011 03:39 PM, Magnus Westerlund wrote:
>>
>> Still, I think we may be talking about CPU time per packet well below a
>> millisecond for the middle case.
>
> Yes, but if your goal for how many streams a single media range server 
> should handle is in the region of 100000 or more, then it does matter.

Hm. 100.000 streams of audio at 50 pps is 5 Mpps.
At average packet size 128 bytes, this is 640 Mbytes/sec, or 5 Gbits/sec.

You need 6 cores equivalent to Eric Rescorla's Macbook Air (which 
encrypts on the order of 100 MB/s, no hardware encryption support) to 
handle encryption of those streams.

Or two Altera AES cores 
(http://www.altera.com/products/ip/dsp/encryption_decryption/m-dcr-aes_enc.html).

Yes, it does matter. Somewhat.

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