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Re: Ask a question~~

From: Ian B. Jacobs <ij@w3.org>
Date: Wed, 08 Aug 2007 03:35:44 +0000
To: "He, Shelly" <Shelly.He@genesys.com>
Cc: site-comments@w3.org, chris@w3.org
Message-Id: <1186544144.8044.36.camel@localhost>
On Wed, 2007-08-08 at 11:16 +0800, He, Shelly wrote:
> Hi, guys in W3 Company,
> 
>  
> 
> I am a Validation Engineer in Genesys.
> 
> Yesterday I learned a document from your web sit. But I don’t
> understand the meaning of the “eff” marked in yellow.
> 
> Could you give me some explanations? 

Hello,

I believe you are referring to this report (February 1997)
 http://www.w3.org/Talks/970210HTTP/all.htm

I found a more recent version of the paper (June 1997)
 http://www.w3.org/Protocols/HTTP/Performance/Pipeline.html

In the later version, the "eff" column is replaced by "%ov"
where "%ov is the percentage of overhead bytes due to TCP/IP packet
headers."

From a quick glance:

  %ov = (1.0 - eff) * 100

I'm not sure (and am not one of the authors of the report), but it looks
like they replaced "eff" with "%ov," which perhaps was more
communicative.

I'm cc'ing Chris Lilley, one of the authors of the papers.

Hope that helps,

 _ Ian

P.S. The reason I dug into this a bit is that I co-wrote a summary
of the report many years ago:
 http://www.w3.org/Protocols/NL-PerfNote.html

> Thank you very much!
> 
>  
> 
>                                 Jigsaw
>                                     -
>                      High Bandwidth, Low Latency 
>                                    
>                                    
>                                    
>                                    
>                                    
>                                    
>                                    
>                                    
>                                  First
>                                  time
>                               retrival 
>                                    
>                                    
>                                  Cache
>                               validation
>                                    
>                                    
>                                    
>                                    
>                                    
>                                Packets
>                                    
>                                    
>                                  bytes
>                                    
>                                    
>                                  time
>                                    
>                                    
>                                  eff.
>                                    
>                                    
>                                Packets
>                                    
>                                    
>                                  bytes
>                                    
>                                    
>                                  time 
>                                    
>                                    
>                                  eff.
>                                    
>                                    
>                                    
>                                    
>                                    
>                                HTTP/1.0
>                                    
>                                    
>                                  455.2
>                                    
>                                    
>                                187525.6
>                                    
>                                    
>                                  1.12 
>                                    
>                                    
>                                 0.912 
>                                    
>                                    
>                                  362.8
>                                    
>                                    
>                                58993.0
>                                    
>                                    
>                                  0.76 
>                                    
>                                    
>                                 0.803 
>                                    
>                                    
>                                    
>                                    
>                                    
>                                HTTP/1.1
>                                    
>                                    
>                                  234.4
>                                    
>                                    
>                                189938.0
>                                    
>                                    
>                                  1.32 
>                                    
>                                    
>                                 0.953 
>                                    
>                                    
>                                  88.4
>                                    
>                                    
>                                16878.0
>                                    
>                                    
>                                  0.80 
>                                    
>                                    
>                                 0.827 
>                                    
>                                    
>                                    
>                                    
>                                    
>                           HTTP/1.1 Pipelined
>                                    
>                                    
>                                  168.0
>                                    
>                                    
>                                189646.0
>                                    
>                                    
>                                  0.69 
>                                    
>                                    
>                                 0.966 
>                                    
>                                    
>                                  27.6
>                                    
>                                    
>                                16878.0
>                                    
>                                    
>                                  0.52 
>                                    
>                                    
>                                 0.939 
>                                    
>                                    
>                                    
>                                    
>                                    
>                           HTTP/1.1 Pipelined
>                                  and
>                              compression
>                                    
>                                    
>                                  140.4
>                                    
>                                    
>                                158460.0
>                                    
>                                    
>                                  0.59 
>                                    
>                                    
>                                 0.966 
>                                    
>                                    
>                                  27.2
>                                    
>                                    
>                                16873.0
>                                    
>                                    
>                                  0.47 
>                                    
>                                    
>                                 0.939 
>                                    
>                                    
>                                    
>                                    
>                                    
>  
> 
> Best Regards,
> 
> Shelly
> 
> ==============================
> 
> Shelly He, Validation Engineer, 
> 
> Department: Systems Engineering Testing,
> 
> Company: Genesys Conferencing,
> 
> Address: 333 North Chengdu Road, 
> 
> 1902-1905 Suite, Shanghai, 200040, 
> 
> Phone: +86 21 6135 2246
> 
> Mobile: +86 139 1626 8060
> 
> shelly.he@genesys.com
> 
> www.genesys.com 
> 
> 
> 
>  
> 
> 
-- 
Ian Jacobs (ij@w3.org)   http://www.w3.org/People/Jacobs
Tel:                     +1 718 260-9447

Received on Wednesday, 8 August 2007 03:35:49 GMT

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