XPost: alt.comp.os.windows-11   
   From: dan@djph.net   
      
   On 2025-09-09, Daniel70 wrote:   
   > On 9/09/2025 12:05 am, Dan Purgert wrote:   
   >> On 2025-09-08, Daniel70 wrote:   
   >>> On 8/09/2025 11:50 pm, R.Wieser wrote:   
   >>>> Daniel,   
   >>>>   
   >>>>> If I START NOW how does the clock at the other end know when to START   
   that   
   >>>>> clock. Sure, they'll know when to STOP that clock.   
   >>>> ...   
   >>>>> Conversely, when the distant end STARTs to send infomation, the know when   
   >>>>> to start that clock .... but how do they know when they should STOP that   
   >>>>> clock??   
   >>>>   
   >>>> Thats the nice thing about TCP (as in: TCP/IP) communications : When the   
   >>>> receiver finishes receiving a block of data it will send a signal back   
   that   
   >>>> the block is received correctly, and the next block may be send - or that,   
   >>>> as the sending-side indicated, the last block was received.   
   >>>>   
   >>>> iow, *both* sides can start timers and get an accurate duration of the   
   >>>> transmission.   
   >>>>   
   >>>> Regards,   
   >>>> Rudy Wieser   
   >>>>   
   >>>>   
   >>> But both sides only know when a FULL CYCLE has been completed .... not   
   >>> two half cycles.   
   >>   
   >> What is a "full" or "half" cycle?   
   >>   
   > I know when I send something out .... and I know when I receive   
   > something back .... e.g. I made my post at 23:58, yesterday, 08/09/25   
   > and, if I had still been online, I might have received your reply at   
   > 0005, 09/09/25 .... so this full cycle took "7 minutes". But I did   
   > receive it now, 20:15, 09/09/25   
   >   
   > I know that not a good example for this situation but, hopefully, you   
   > get what I mean by "full" or "half" cycle?   
      
   Yeah, I get it now.  It's not how speed tests work, because the files   
   being transferred are large enough that one Round-Trip Time ("RTT") is   
   going to largely impact the calculations (also, both ends know the RTT,   
   since you figured out "best server" by pinging several).   
      
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