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Re: Idempotent partial updates

From: Mark Nottingham <mnot@mnot.net>
Date: Thu, 1 Mar 2012 10:02:09 +1100
Cc: Amos Jeffries <squid3@treenet.co.nz>, ietf-http-wg@w3.org
Message-Id: <4FD6F29B-8B30-4CD7-B56F-6A6C00F849D2@mnot.net>
To: Adrien de Croy <adrien@qbik.com>
I'm talking to Steve about getting more fine-grained caching stats in there now…

On 01/03/2012, at 10:00 AM, Adrien de Croy wrote:

> 
> 
> On 1/03/2012 11:56 a.m., Mark Nottingham wrote:
>> On 01/03/2012, at 9:34 AM, Adrien de Croy wrote:
>> 
>>> Last time I sampled Cache-control response headers (over couple million hits crawling sites), I found a large majority use it to prevent caching.  Very few to enable it.  It's a shame.
>>> 
>>> so moving from a naive HTTP/1.0 style cache to a compliant HTTP/1.1 style cache actually resulted in a huge reduction in cache utility.  Without ignoring cache-control directives as you say, it's hard to get more than a 10% effective bandwidth benefit from caching, which frankly is not worth the pain.
>> Not sure what you're crawling, but my experience is that effective bandwidth savings is MUCH higher, even on a conservatively configured cache.
> 
> it was a couple years ago now.
> 
> 
>> 
>> And anecdotal evidence suggests it's getting better; see:
>> 
>> http://httparchive.org/trends.php (~45% of responses have caching headers)
>> http://httparchive.org/interesting.php  (~40% of responses with CC have a max-age>  0)
> 
> ok, that 40% of 45% = 18% overall.
> 
>> 
>> … and if you restrict to the top 1000 sites, both numbers are higher, about 60% each. Combined with heuristic freshness, what's the problem?
> 
> did you do any tests without heuristic freshness?  That's the area where in the past we've had the most problems.
> 
> Cheers
> 
> Adrien
> 
>> 
>> Cheers,
>> 
>> --
>> Mark Nottingham
>> http://www.mnot.net/
>> 
>> 
>> 
>> 
> 
> -- 
> Adrien de Croy - WinGate Proxy Server - http://www.wingate.com
> WinGate 7 is released! - http://www.wingate.com/getlatest/
> 

--
Mark Nottingham
http://www.mnot.net/
Received on Wednesday, 29 February 2012 23:02:39 GMT

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