DH-PFM881 User Manual All Right Reserved
Page 32
Burst defines the how many bytes allowed for downloading/uploading during a
quick time. That leads to momentary throughput can greater than the limit value.
Figure 24 Traffic Shaping Settings
z
Ingress traffic entering wlan0, control the input rate
z
Egress traffic
exiting
wlan0, control the output rate
The relationship of rate and burst for ingress:
z
Set burst to 0, the rate of ingress is unlimited
z
Set burst to about 1/10 of rate limit, the rate curve is stable
z
Set burst larger than rate limit, the rate curve will hold a high value for a while then
down to stable
Below is the table that reflects the relationship between ingress rate limit and
burst.
Ingress
Throughput when reach stable
RateLimit(kbps)
Burst(Kbytes)
（Mbps） Description
10000
0
29.587 Unlimited
10000
10
4.286 Stable
10000
100
8.037 Oblique up to stable
10000
1000
8.825 From 9.5 down to stable
10000
10000
8.6 From 28.5 down to stable
10000
40000
8.6
Hold on 10 seconds at 29.6, then
suddenly down to stable
The relationship of rate and burst for egress:
z
Set burst less than 1/10 of rate limit, the rate curve is stable totally
z
Set burst larger than rate limit, the rate curve will hold a while at a higher value then
down to stable