Understand the bandwidth usage on production.

Hi all, i try to understand the bandwidth usage on production time on the network. I took one C3560G with all device are conected to 1000Mb/s.
I make: show int gi0/1
5 minute input rate 320000 bits/sec, 555 packets/sec
5 minute output rate 9787000 bits/sec, 821 packets/sec
The total is: 10.1 Mb/sec (on this port)
In all active port the summary is: 47 Mb/s (input rate+output rate in all ports)
So, i used 4,7% of the total of the bandwidth. And in cacti (by snmp) software i see one device transfer data with a maximun of 24Mb/s. Why don't use more bandwidth if is available?
Some can give me a hand to understand this?
Thanks!

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So, the bandwidth is limited for the windows size. How i manualy set the RWIN? in a LAN is posible?
Yes, it's often possible. How depends on the host. Search the Internet for BDP and your host IOS, and you'll likely find how to adjust.
PS:
BTW, too large a RWIN can cause a sender to send too many packets at one time which can result in drops. Have you checked your transit interfaces for drops?
Ideally, RWIN should be sized for BDP; not smaller and not larger.

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