[ale] nfs & collisions

[Hogg, Russell E]

>>
Remember, an Ethernet collision is basically an "excuse me; try again."Â  The 
overall effect of adding latency to that process is not unlike watching Bill 
O'Reilly argue with someone via satellite.
>>



Ok that was just funny.
I laughed out loud at my desk.






__________________________________
ctcrreho at opm.gov



-> -----Original Message-----
-> From: hbbs at attbi.com [mailto:hbbs at attbi.com]
-> Sent: Monday, February 24, 2003 2:06 PM
-> To: ale at ale.org
-> Subject: Re: [ale] nfs & collisions
-> 
-> Correct me if I'm wrong, someone, but in an Ethernet hub, I don't think
-> there
-> is an *electrical* commonality between the ports the way there would be
-> if you
-> were srtinging thickwire or thinwire.  This means that there has got to
-> be some
-> meaningful delay between activity at one port and any other in a hub.
-> Put two
-> hubs together and Hub B can't even begin to react to traffic on a port on
-> Hub A
-> until the port on Hub A to which Hub B is connected reacts to traffic
-> elsewhere
-> on Hub A.  Ordinarily this latency is not a big deal, but if you are
-> trying to
-> push big stuff around, then it is, and I get the feeling that the time
-> spent
-> detecting and resolving collisions goes up too, because it takes longer
-> for the
-> collision *and* its resolution to propagate.
-> 
-> Remember, an Ethernet collision is basically an "excuse me; try again."
-> The
-> overall effect of adding latency to that process is not unlike watching
-> Bill
-> O'Reilly argue with someone via satellite.
-> 
-> - Jeff
-> > On Mon, Feb 24, 2003 at 05:10:53PM +0000, hbbs at attbi.com wrote:
-> > > If you're trying to push ~20GB between two machines through four
-> unswitched
-> > > (and I presume 10base-T) hubs, then, yeah, it's gonna collide like a
-> SOB and
-> > > take 31 hours.  At the very least, get the two machines on the same
-> hub, but,
-> > > better yet, put a 10/100 switch in place.  Just because the four
-> cascaded hubs
-> > > works doesn't mean it works efficiently.  The latency is just going
-> to be
-> > awful.
-> >
-> > <tangent>
-> > Would putting the two machines on the same hub really make any
-> > difference?  I thought unswitched hubs always broadcast all traffic
-> over
-> > all ports.  Or is an unswitched hub still smart enough to broadcast the
-> > traffic only on the local ports if the destination address is local?
-> > Just curious.
-> > </tangent>
-> >
-> > Jason
-> > --
-> > Jason Day                                       jasonday at
-> > http://jasonday.home.att.net                    worldnet dot att dot
-> net
-> >
-> > "Of course I'm paranoid, everyone is trying to kill me."
-> >Â Â Â Â  -- Weyoun-6, Star Trek: Deep Space 9
-> > _______________________________________________
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-> > Ale at ale.org
-> > http://www.ale.org/mailman/listinfo/ale
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