[26103] in resnet
Re: Bandwidth Concerns
daemon@ATHENA.MIT.EDU (Jason Healy)
Wed Mar 23 22:19:45 2011
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Message-ID: <9957F473-479A-40D8-BB6F-7955DB93652E@logn.net>
Date: Wed, 23 Mar 2011 22:19:27 -0400
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Jason Healy <jhealy@logn.net>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <AANLkTinTu8-1N9V27Xosdxb3scJP=Vd+7rVV3eqDLAJf@mail.gmail.com>
On Mar 23, 2011, at 6:42 PM, Doughty, Marc wrote:
> Anyone have a content cache running? Does it help if you're caching all the fixed elements of from these Web 2.0-type pages?
We run a transparent squid proxy for our 500 users (it's offline at the moment so we can change the way we run traffic through it, but has been running all year until now). This is for a 45Mbit/s connection.
We're seeing a 30% byte hitrate, which is higher than what the squid folks say you typically see in this kind of setup. This is mainly because:
- we're an all-Apple campus (so software updates are cached)
- we use Sophos anti-virus (signature updates are cached)
Even excluding that, the hit rates are still pretty good (28% for "typical" sites). Facebook serves its large content from their CDN, which is cache-friendly. Where the cache does *not* do so well are:
- Youtube (served from different CDN farms, hard to cache, but there are squid "tricks" to cache it that we haven't tried yet)
- Flash-based streaming (using non-HTTP transport), or encrypted/customized downloads (iTunes store)
Squid boxes are pretty cheap to set up; I recommend trying it out to see if you can save yourself a little bandwidth for hot items. Even if you only did it for windows and apple software updates, it could make a difference...
Jason
--
Jason Healy | jhealy@logn.net | http://www.logn.net/
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