[Babel-users] tunnels

[Christof Schulze]

On Sat, Oct 13, 2018 at 05:23:35PM -0700, Dave Taht wrote:
>On Sat, Oct 13, 2018 at 9:26 AM Justin Kilpatrick <justin at altheamesh.com> wrote:


>> > > On Sat, Oct 13, 2018 at 12:01:54AM -0700, Dave Taht wrote:
>> > I get that bandwidth figure a lot for wireguard. I care about  latency
>> > far, far more under a full bidirectional load. Having got base wifi so
>> > much better, and the edge connections sqm-scripts massively better, I
>> > am wondering if wireguard got on the stick yet?

>> > I wrote about this problem in an early version of wireguard here:
>> > http://blog.cerowrt.org/post/wireguard/

>> > As of kernel 4.4 (?) ipsec does take advantage of the fq_codel hash.
>> > the before latency was 100+ms in the tunnel for voip, 2ms after.

>> I can confirm that fq_codel works with Wireguard tunnels just fine. The latency added by a tunneled hop is around 1-2ms.
>
>that is not a possible result. The classic simplest bufferbloat test
>is start a ping, then do a big 60 sec upload or download from a server
>on the other side of that link. Over wifi that's a minimum resulting
>delay of 10ms, closer to 20, nowadays. about 2 over cake on ethernet.
>
>but: Over the wireguard tunnel I tested 2 years or so back, 150ms induced delay.
>
>from tcp on an openwrt router, it's probable that the pacing_rate bug
>still exists which means it's tcp can't flood the link - which is a
>good thing in this case but... users aren't on the routers. users
>don't just ping or download or upload once at a time.
This is what happens for icmp6 for me before during and after an iperf 
with 5 concurrent streams over a connection using one wifi mesh-hop and 
one wireguard-vpn hop

 Bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=212 ttl=62 time=38.0 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=213 ttl=62 time=30.8 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=214 ttl=62 time=31.5 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=215 ttl=62 time=37.2 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=216 ttl=62 time=31.5 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=217 ttl=62 time=32.7 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=218 ttl=62 time=33.0 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=219 ttl=62 time=32.1 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=220 ttl=62 time=31.8 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=221 ttl=62 time=53.2 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=222 ttl=62 time=82.8 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=223 ttl=62 time=57.5 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=224 ttl=62 time=32.2 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=225 ttl=62 time=29.8 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=226 ttl=62 time=247 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=227 ttl=62 time=222 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=228 ttl=62 time=245 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=229 ttl=62 time=325 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=230 ttl=62 time=252 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=231 ttl=62 time=262 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=232 ttl=62 time=261 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=233 ttl=62 time=342 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=234 ttl=62 time=386 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=235 ttl=62 time=422 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=236 ttl=62 time=178 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=237 ttl=62 time=29.9 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=238 ttl=62 time=32.3 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=239 ttl=62 time=34.8 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=240 ttl=62 time=31.0 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=241 ttl=62 time=39.2 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=242 ttl=62 time=40.2 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=243 ttl=62 time=54.3 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=244 ttl=62 time=73.5 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=245 ttl=62 time=58.6 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=246 ttl=62 time=59.0 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=247 ttl=62 time=228 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=248 ttl=62 time=108 ms
64 bytes from 2a06:8187:fbab:1::9000:2: icmp_seq=249 ttl=62 time=63.6 ms

>
>> Here's some iperf data, but not as latency focused as you would probably like.
>
>nope. also udp fragmenting is iperf's default mode.
>
>> https://forum.altheamesh.com/t/althea-performance/44/3

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