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Bandwidth Emulators (HTML VU)
Has anyone had any issues with the bandwitch emulators in LR. I've recently ran tests with the following results which although are within a pattern they seem incorrect. The results I got for a single user (through VUGEN)
LR ver 2.51
HTML page size 82k
2MB = 0.5 sec
1MB = 1.0
512kb = 1.4
128kb = 8 sec
64kb = 9 sec
any help or view on this would be appreciated !!
Re: Bandwidth Emulators (HTML VU)
82KB * 1024 = 83968 Bytes * 8 = 671744 bits
All speeds are expressed in bits per second.
I.E. 2 Mbs = 2,000,000 bits per second.
Expected minimum response times:
2 Mbs = 671744/2000000 = 0.34 seconds versus 0.5. That is 148.87% of the minimum response time.
1 Mbs = 671744/1000000 = 0.67 seconds versus 1. That is 148.87% of the minimum response time.
512 kbs = 671744/512000 = 1.31 seconds versus 1.4. That is 106.71% of the minimum response time.
128 kbs = 671744/128000 = 5.25 seconds versus 8. That is 152.44% of the minimum response time.
64 kbs = 671744/64000 = 10.5 seconds versus 9. That is 85.75% of the minimum response time.
I must agree that the numbers seem to be a bit off.
Particularly the last number for 64 Kbs, this is simply not possible.
You can probably explain longer response times but not shorter than the minimum.
On another note, I think it is a mistake to simulate the rated bandwidth.
The actual achieved bandwidth is most of the time not higher than 75% of the posted width.
Particularly connections with modems seem to suffer from that. But I have seen less than stellar throughput on higher rated connections just because of competing traffic on the internet, hops, delays, retransmissions etc.
Most of your numbers actually seem to have that 75% factor in there. So I would not directly dismiss them.