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Posted by Peter D on 01/22/08 22:09
"Ilya Zakharevich" <nospam-abuse@ilyaz.org> wrote in message
news:fn3cb5$71n$1@agate.berkeley.edu...
> [A complimentary Cc of this posting was sent to
> Peter D
> <please@.sk>], who wrote in article <13p9pfbrchlpi54@corp.supernews.com>:
>> > If you know WHY the throughput is not close to the theoretical maximum,
>> > please explain.
>>
>> It's all there.
>
> yeah, right...
It is. Your lack of comprehension doesn't make it any less so. Others have
explained it even better than I did. There's been a "plethora" or
non-technical and technical explanations. If you haven't "got it" yet, I
doubt you ever will. And that's too bad. But it's your problem, and not
mine. That said, here's one last attempt to sort through your whining.
>> The theoretical bandwith (400Mbit/sec) relies on perfect cable length,
>> perfect cable materials, and perfect hardware acting perfectly while
>> doing
>> nothing else.
>
> If it were so, how would this differ from Firewire?
Huh? Firewire is better because it is more efficent, has lower CPU overhead,
and employs a more direct way of managing the data stream. USB doens't.
> And since using
> better cables and hardware which does nothing else DOES NOT improve
> the USB throughput, I do not think this is a correct explanation.
Sure it does. But it doesn't improve it sufficiently to make it a viable
alternative to Firewire for Video transfer.
>> and more than one item on the USB 'network' degrades performance.
>
> Why do you repeat this BS?
Because it's true.
> Having a dedicated USB controller does not let performance to be anywhere
> close to the theoretical maximum.
So? That's not what I said
>> further. USB is inherently "busy" and "chatty". And that makes it useless
>> for Vidoe transfer if Firewire is available.
>
> Year, right! Now a presence of Firewire starts to influence USB
> performance...
What? You really need to work on your English langiage comprehension skills!
There is no way to read those two sentences and come to the conclusion you
did.
Anyway, I'm done. The common language of communcation in this thread is
English. If it's not your first language and you're unwilling to improve
your comprehension skills, I can't help you any further. Good luck.
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