On (2007-04-12 19:51 +0200), Iljitsch van Beijnum wrote:
8 bytes preamble 14 bytes ethernet II header 20 bytes IP header 20 bytes TCP header 12 bytes timestamp option 4 bytes FCS/CRC 12 bytes equivalent inter frame gap
90 bytes total overhead, 52 deducted from the ethernet payload, 38 added to it.
90 / (1500 - 52 = 1448) * 100 = 6.21
90 / (9000 - 52 = 8948) * 100 = 1
Also note that the real overhead is much bigger because for every two full size TCP packets an ACK is sent so that adds 90 bytes per 2 data packets, or increases the overhead to 9% / 1.5%.
Aren't you double penalizing? Should it be: [ytti@nekrotuska ~]% echo "90 / (1500+38) * 100"|bc -l 5.85175552665799739900 Or other way to say it: [ytti@nekrotuska ~]% echo "100-(1448/(1+7+6+6+2+1500+4+12)*100)"|bc -l 5.85175552665799740000 -- ++ytti