某LTE运营商SpeedTest测速分析

1.1

SpeedTest

测速分析

1.1..1

SpeedTest

测速原理介绍

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首

先

，

从

SpeedTest

官

网

（

）

找

到

了

SpeedTest

下载测速的原理 ，具体如下：

1.

Your computer downloads small binary files from the web server to the client,

and we measure that download to estimate the connection speed.

2.

Based off this result, we choose how much data to download for the real test.

Our

goal

is

to

pick

the

right

amount

of

data

that

you

can

download

in

10

seconds,

ensuring

we

get

enough

for

an

accurate

result

but

not

take

too

long.

3.

We

prevent caches

from

throwing

off results

by

appending

random

strings

to each download.

4.

Once

we

start

downloading,

we

use

up

to

four

HTTP

threads*

to

saturate

your connection and get an accurate measurement.

5.

Throughput samples are received at up to 30 times per second.

6.

These

samples

are

then

aggregated

into

20

slices

(each

being

5%

of

the

samples).

7.

The

fastest

10%

and

slowest

30%

of

the

slices

are

then

discarded.

We'll

explain that more below.

8.

The remaining slices are averaged together to determine the final result.

*

Deciding the number of threads: will use up to four http threads

during the download

and

upload portions of the test. However, it will only use

more than two threads if they are needed to accurately measure the speed, so as

to minimize the effect of HTTP overhead on lower-speed connections. After the

pre-test,

if

the

connection

speed

is

at

least

4

megabits

per

second,

then

will

use

four

threads.

Otherwise,

it

will

default

to

two

threads.

However, there is a hurdle on older browsers: on Internet Explorer 7 and earlier

(as

well

as

Firefox

2

and

earlier),

the

browser

strictly

adheres

to

the

HTTP

specification of only two threads per hostname. So for those older

browsers, in

order to scale up to four threads we must open the third and fourth thread to a

secondary URL provided by the host that points to the same server. This way, we

can

work

around

the

limitations

of

those

older

browsers

and

still

measure

higher-speed

connections

accurately.

Most

of

our

hosts

do

have

a

working

secondary URL, but if you're testing from an older browser to a host that doesn't,

will be limited to two threads at maximum. This is one reason why

we recommend that all visitors use up- to-date browsers.

解读关键点：

1.

测量结果中最快的

10%

和最慢的

30%

采样 点不计入评估结果

2.