Re: [squid-users] squid performance

Hmm... maybe those numbers are only for shared networks.

I didn't make up the 37% number. I actually got it from a book talking
about Cisco equipment and it was talking about ethernet.

Adam Lang
Systems Engineer
Rutgers Casualty Insurance Company
http://www.rutgersinsurance.com
----- Original Message -----
From: "Pranav Desai" <prdesai@Bayou.UH.EDU>
To: "Adam Lang" <aalang@rutgersinsurance.com>
Cc: "Squid-Users" <squid-users@squid-cache.org>
Sent: Friday, June 08, 2001 2:12 PM
Subject: Re: [squid-users] squid performance

> i dont think thats quite true ... i have a 100Mbps switched network
> ...and i always get about 70Mbps .... atleast iperf and NWS (Network
> Weather Service) shows so ...
>
> pranav
>
> On Thu, 7 Jun 2001, Adam Lang wrote:
>
> > You're never going to get 100 Mbps.
> >
> > For starters, the theoretical maximum of Ethernet is about 37% of raw
wire
> > speed. So even under most ideal conditions, you are never getting above
> > 37Mbps on a 100 Mbps line.
> >
> > Next, some of that bandwidth that is not being measured but neccessary,
are
> > the hosts talking back and forth with each other... outside of the
actual
> > data being transfered.
> >
> > Finally, if you are plugged into a hub, you have to divided the amount
of
> > available bandwidth by the number of active hosts (hubs are shared
> > bandwidth, sqitches aren't).
> >
> > If you have a 100 Mbps line, with three hosts talking on it at the same
> > time, you are looking at:
> >
> > 100 x .37 / 3 = 11Mbps.
> >
> > Then you have to figure chatter between the hosts to keep a TCP session
> > going... makes you realize the bandwidth still is not that amazing. :)
> >
> > Of course I don't have a degree in electrical engineering and the books
I
> > have read could be all bunk, but this is how I understand things work.
> >
> > Adam Lang
> > Systems Engineer
> > Rutgers Casualty Insurance Company
> > http://www.rutgersinsurance.com
> > ----- Original Message -----
> > From: "Subbarao Gaddamadugu" <sgaddama@cs.uml.edu>
> > To: <sgaddamadugu@hotmail.com>
> > Cc: "Squid-Users" <squid-users@squid-cache.org>
> > Sent: Thursday, June 07, 2001 3:42 PM
> > Subject: [squid-users] squid performance
> >
> >
> > > i'm doing a test on squid performance.
> > > the client, squid and web server are connected over 100 Mbps line.
> > > why can't i get more than 3.5 Mbps throughput
> > >
> > > how should i tune squid to use available bandwidth.
> > >
> > > subba
> >
> >
Received on Fri Jun 08 2001 - 12:27:57 MDT