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USB Transfer Rate


Loopy

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Ok to ima smisla naravno, ali bi mi trebalo tehnicko objasnjenje (odgovaram na neka pitanja za predmet na koledzu - unix je predmet a on nas pita o USB.. koji lik).

Sto koji lik ?

uradis malo dd upis na USB pa onda dd citanja sa USB-a sve to radis dok je vmstat ukljucen. pa napravis analizu sta se desava tamte a sta vamte.

pa probas sa USB 1.1 USB 2.0 i sa USB 3.0 da se vidi lepo gde je ogranicenje sam interface a gde memorija na disku.

pa mu onda zacinis malo sa detaljima, kazes pre svakog testa smo radili

echo 3 > /proc/sys/vm/drop_caches

Sto se lepo vidi na vmstat outputu ovde:

0 0 248 72132 394452 589004 0 0 0 28 1110 1463 2 0 98 0 0

0 0 248 72132 394468 588988 0 0 0 72 1114 1691 4 0 96 0 0

3 0 248 967784 444 124256 0 0 0 0 1066 1112 3 7 91 0 0 << drop_caches

0 0 248 1235128 524 86980 0 0 88 12 1074 1030 2 9 85 4 0

0 0 248 1235128 524 87044 0 0 4 0 1019 872 2 0 98 0 0

bla bla bla i tako za sve ima da se upiski porfesor od srece!

Edited by stator
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