Subject: problems achieving decent throughput with latency.
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I am testing my latency-insertion tool, and I notice that tcp will not use
all of the available bandwidth if there is any significant amount of latency
on the wire.
For example, with 25ms latency in both directions, I see about 8Mbps
bi-directional throughput.
If I lower that to 15ms, I see 12Mbps bi-directional throughput.
I see 27Mbps at 5ms.
Here is the /proc/net/tcp output at 5ms latency.
machine demo2
13: 050302AC:80EB 070302AC:80EB 01 0005900C:0002012E 01:00000016 00000000 0 0 578943 3 c6628a80 22 4 1 45 -1
machine demo1
11: 070302AC:80EB 050302AC:80EB 01 00010DDB:00000000 01:00000014 00000000 0 0 513094 3 c62c5080 21 4 1 45 -1
Any ideas why it is so slow at the higher latencies? Any other info
I can gather to help determine the cause?
(UDP does not experience this slowdown, so I believe my latency
insertion tool is working as designed, but it's always possible it is
to blame...)
--
Ben Greear
President of Candela Technologies Inc http://www.candelatech.com
ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
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