[Info-vax] Marketing ideas for VSI ?

[Bill Gunshannon]

On 12/15/18 3:48 PM, Kerry Main wrote:
>> -----Original Message-----
>> From: Info-vax <info-vax-bounces at rbnsn.com> On Behalf Of Dave Froble
>> via Info-vax
>> Sent: December 15, 2018 3:24 PM
>> To: info-vax at rbnsn.com
>> Cc: Dave Froble <davef at tsoft-inc.com>
>> Subject: Re: [Info-vax] Marketing ideas for VSI ?
>>
>> On 12/15/2018 2:05 PM, Scott Dorsey wrote:
>>> Dave Froble  <davef at tsoft-inc.com> wrote:
>>>>
>>>> Now, I'm not a network person.  I'm lucky if I can properly plug in
>>>> an
>>>> RJ45 plug.  But, I'd ask, if you have more to push through a pipe
>>>> than the pipe can handle, why not more pipes?
>>>
>>> That's basically what we have been doing for the past 40 years or so.
>>> More pipes, and fatter pipes, and that is why we have far more
>>> bandwidth today than we had in the seventies.
>>>
>>> But... we don't have any less latency.  In fact we have more latency
>>> since store-and-forward systems now wind up having to store more data
>>> in-transit in order to sort and filter, quite often.
>>>
>>> Now, one of the things we do have are better ways to deal with
>>> latency.  The VoIP people have much better echo cancellation than they
>>> used to have... so although there may be a second lag time between the
>>> time you stop speaking and the time the next person speaks, the effect
>>> is not as annoying as it might be.
>>>
>>> A lot of protocols have evolved to deal with higher latency.  We don't
>>> use Berkeley r-protocols anymore.  But more pipes and fatter pipes
>>> don't solve latency issues.
>>> --scott
>>>
>>>
>>
>> So, are you saying, waiting for a chance at the "pipe" isn't much of a
> latency
>> problem?
>>
>> As I mentioned, I don't know much about these things.
>>
> 
> An analogy ..
> 
> 6 cars lined up on a 6 lane highway that is exactly 100 miles long -
> straight as an arrow with each car max speed = 200mph.
> 
> The fastest any one car will make it to the end is 30mins (latency)
> 
> Now, in this scenario, a total of 6 cars can make the trip in 30min's
> (bandwidth)
> 
> Adding an additional 6 lanes to the highway to improve the bandwidth means a
> total of 12 cars can make it to the end in the same amount of time.
> 
> However, the fastest any one car can make it to the end is still 30min's.
> 
> 

But you are only looking at one meaning for latency.  That's
why I said real world as opposed to theoretical.  In your example
as soon as you ad a 7th car a somebody has to arrive later. And
the other flaw in your analogy is all traffic is single packets.
The 7th (to nth) additional car can be solved by adding lanes
or additional highways of 6 lanes each.  This has been done and
thus the reason I said that real world latency has decreased.

Of course, if your long distance cluster runs on your own private
network with no traffic other than your cluster traffic then the
it isn't a problem.  But that is also something that has changed
in the last 20 years.  More peole have the technical and financial
ability to do that so the argument still stands.  If you want to
sell VMS long distance clusters are one of its strongest points.

bill