New Zealand ADSL Mailing List


Re: Anyone noticing general performance degradation lately

From: Lennon - Orcon <lennon_at_orcon.net.nz>
Date: Sun, 10 Apr 2005 23:10:23 +1200
Message-ID: <000a01c53dbd$e6434a10$0100000a@lennons>

> At 12:12 p.m. 10/04/2005, you wrote:
>>Mine seems to be within Global Gateway...
>>
>> 5 ge-0-3-0-6.akbr3.global-gateway.net.nz 40.894 ms
>> 6 p1-3.sjbr1.global-gateway.net.nz 167.555 ms
>> 7 so2-1-0.pabr3.global-gateway.net.nz 200.380 ms
>
(I probably made a huge mistake somewhere here which will show the maths all
wrong)
Getting lower than ~120ms to the US and lower than ~25ms to AU is pretty
hard

This is an example from NZ->US.. hop 3->4 is when it leaves NZ and goes to
US

 Host Loss% Snt Last Avg
Best Wrst StDev
 1. 219.88.240.129 0.0% 6 1.0 1.0
0.6 1.9 0.5
 2. 60.234.9.1 0.0% 6 0.6 2.8
0.6 11.5 4.3
 3. 203.96.64.125 0.0% 6 1.3 1.5
1.1 2.0 0.3
 4. 202.50.116.178 0.0% 6 125.7 126.0
125.7 126.4 0.3
 5. 202.37.245.230 0.0% 6 128.4 129.0
127.7 130.9 1.3
 6. 202.37.245.102 0.0% 5 128.7 136.8
128.3 169.5 18.3

This is an example from NZ->AU.. hop 3->4 is when it leaves NZ and goes to
AU

 1. 219.88.240.129 0.0% 4 1.2 0.9
0.7 1.2 0.2
 2. 60.234.9.1 0.0% 4 0.9
0.9 0.8 1.1 0.1
 3. 203.96.64.125 0.0% 4 2.1 1.8
1.6 2.1 0.3
 4. 203.96.120.230 0.0% 4 25.5 25.7
25.5 26.1 0.3
 5. 203.96.117.74 0.0% 4 26.1 26.0
25.5 26.4 0.3
 6. 203.63.217.2 0.0% 4 27.2 26.7
25.9 27.3 0.7

The latency between the hops 3->4 in both are caused by well.. 1/2 caused by
distance (speed of light) and 1/2 caused by the routers (its very hard to
process data at the speed of light, so routers have to do it a little
slower)

so NZ->US = 62ms (milliseconds)
    NZ->AU = 12ms (milliseconds)

Working out the speed of light it can go in this time (speed of light =
299792458 ms-1) (meters second to the power of -1) (ms-1(speed) * s(time) =
m (distance))
NZ-> US 18587km
NZ->AU 3597km

Actual Distance (estimate)
NZ->US 10517km
NZ->AU 2157km

Thanks
Craig Whitmore

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Received on Sun Apr 10 23:10:16 2005

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