First, we analyze the impact of the web page size on power
consumption. We expected large contents would need more
computing resources, resulting in high power. Table 2 shows
that the size of Flash websites is 2.3 × larger than that
of non-Flash ones. We extracted the web page size information
by inspecting HTTP packets, including a string of
“HTTP/1.1 200 OK”. For Flash content detection, we used
the signature of “Content-Type: application/x-shockwaveflash”.
Figure 4 shows the correlation between the web page
size and the power consumption. From Fig. 4, we can show
that the power consumption of web pages is not tightly correlated
with the web page size. The correlation coefficient
for 400 websites is 0.3, that of Flash sites 0.28, and that of
non-Flash 0.21. Therefore, we can presume that the power
consumption of each web content will be decided not by the
web page size but by various attributes of the web contents,
such as the frame rate of the Flash video.
On the other hand, as shown in [20], the traffic load itself
affects the energy consumption of servers and network elements
such as routers. The power use of a video server is
in proportion to the offered load. Energy cost of gateways
was calculated as 150 Wh/Gigabit for the Cisco GSR 12000
First, we analyze the impact of the web page size on powerconsumption. We expected large contents would need morecomputing resources, resulting in high power. Table 2 showsthat the size of Flash websites is 2.3 × larger than thatof non-Flash ones. We extracted the web page size informationby inspecting HTTP packets, including a string of“HTTP/1.1 200 OK”. For Flash content detection, we usedthe signature of “Content-Type: application/x-shockwaveflash”.Figure 4 shows the correlation between the web pagesize and the power consumption. From Fig. 4, we can showthat the power consumption of web pages is not tightly correlatedwith the web page size. The correlation coefficientfor 400 websites is 0.3, that of Flash sites 0.28, and that ofnon-Flash 0.21. Therefore, we can presume that the powerconsumption of each web content will be decided not by theweb page size but by various attributes of the web contents,such as the frame rate of the Flash video.On the other hand, as shown in [20], the traffic load itselfaffects the energy consumption of servers and network elementssuch as routers. The power use of a video server isin proportion to the offered load. Energy cost of gatewayswas calculated as 150 Wh/Gigabit for the Cisco GSR 12000
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