Hi, On Thu, Nov 09, 2017 at 01:16:39AM +0100, Jan Just Keijser wrote: > Admittedly, not as much as you are seeing but it's definitely there and > it is to be expected over a VPN link: during the transfer/throughput > test the VPN is encrypting+decrypting like mad, which will affect > latency at some point.
With TCP, I expect queueing effects to add up as well - with UDP,
OpenVPN just throws out the packet, but with TCP, there are kernel
buffers involved, and if there's a packet getting lost, retransmits
(= delay!!).
In other words: TCP is there because in some cases it's unavoidable
because stupid people block UDP access, but as long as UDP works,
people really should not use TCP.
UDP has even more advantages, like "roaming to new networks and not
losing VPN access" (like --float, automatic in recent 2.3.x servers),
"surviving loss of NAT state in routers / carrier-grade NAT boxes", etc.
gert
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