Linux Router: TCP slow, UDP fast
swmike at swm.pp.se
Sat Feb 14 17:57:33 UTC 2009
On Sat, 14 Feb 2009, Chris wrote:
> The RTTs vary massively because the router is forwarding from websites
> on the LAN to visitors worldwide. Is that what you meant ?
And your TCP speed when doing testing is always 300-600 kilobyte/s
regardless of RTT between the boxes with which you're testing?
Without TCP window scaling turned on on the boxes doing TCP with each
others, you're always limited to 1/RTT*64k bytes/s of transfer speed.
Changing window scaling on the linux router will of course not change the
behaviour of the traffic going thru it, only TCP sessions that itself
Mikael Abrahamsson email: swmike at swm.pp.se
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