Re: [squid-users] What exactly makes accelerator mode faster then transparent mode ?

Thank you Amos,

Suppose that I have to put a WC in front of ONLY ONE
HTTP server and both WC and web server are behind a
load balancer, so the clients will never see whether
traffic comes from a WC or from the server, anyway.

What mode of WC (so transparent or accelerator) will
give me the best performance and why ? Or is there no
difference with respect to performance ?

you mention : "reverse-proxy (or accelerator) -
software that performs many of the service duties of a
'true' web-server"

What web duties can an accelerator WC do, that a
transparent WC cannot do ?

Thanks in advance,

Mark.

--- Amos Jeffries <squid3@treenet.co.nz> wrote:

> Raemaekers Mark wrote:
> > For me it is not clear why an accelerator mode WC
> is
> > faster then a Transparant Mode webcache.
> > This is how I understand both modes after googling
> for
> > about half a day on this topic :
> >
> > WC IN TRANSPARANT MODE (WCTM), When an http
> request
> > hits the WCTM for the second time, then the WC
> will
> > send its cached contents back to the client.
> > Since the info is in the cache, the real web
> server
> > does not have to be contacted by the WCTM.
> >
> > WC IN ACCELERATOR MODE (WCAM) : when an http
> request
> > hits the WCAM for the second time,the the WC will
> look
> > if this request is in its cache and send the
> cached
> > response of this request back to the client. Since
> the
> > info is in the cache, the real web server does not
> > have to be contaced by the WCAM.
> >
> > In both cases (from the second request onwards)
> the
> > real web server is not contacted.
> > So, what exactly makes an accelerator mode WC go
> > faster then ?
> >
>
> Nothing. Neither name accurately reflects the
> operation of the cache.
> Whats the confusion?
>
> proxy - software that sits between a web server and
> a web-client with
> purpose of resource saving or improving web service
> to the clients.
>
> intercepting proxy - software that performs as a
> proxy, but additionally
> can handle traffic redirected to it by a FW without
> the web-clients
> knowledge. Usually typed 'transparent' by those who
> confuse
> client-hidden with totally-invisible.
>
> transparent proxy - software that performs all
> duties of proxy and
> additionally spoofs/hide its IP from both parties
> such that neither can
> detect its existence.
>
> reverse-proxy - software that performs many of the
> service duties of a
> web-server. Redirecting all requests it can't handle
> to a separate
> 'true' web-server or more authoritative source.
>
> accelerator - nickname for reverse-proxy.
>
>
> Amos
> --
> Please use Squid 2.6STABLE17+ or 3.0STABLE1+
> There are serious security advisories out on all
> earlier releases.
>

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Received on Thu Mar 20 2008 - 06:32:11 MDT