Horrible speed to Japan

[ladr]

Tonight I was noticing really slow speed to Japan. Video chats were unusable.

This was speedtest.net's result to a provider in Tokyo:


Local connectivity was fine:


So I assume there is some routing or other connectivity issue between Sonic and Japan.

[virtualmike]

Do a traceroute to the chat server and it should show the routing.

[thulsa_doom]

Latency across the Pacific tends to look pretty bad under the best of conditions, but overall throughput shouldn't be suffering like that. Of course, when I ran the Speedtest.net test (through to Tokyo to see if I could reproduce the problem) it reported 209ms latency:



A quick trace to square.co.jp (the first japanese hostname that sprang to mind) from a server I've got in our datacenter, not but a dozen yards from my desk, shows:

Code: Select all

HOST: REDACTED                     Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- REDACTED                   0.0%    20    1.2   1.3   1.1   2.3   0.3
  2.|-- 2.ge-1-1-0.gw.sr.sonic.ne  0.0%    20    0.4   0.6   0.4   1.6   0.5
  3.|-- 0.ae0.gw2.sr.sonic.net     0.0%    20    1.5   1.3   0.4   1.5   0.4
  4.|-- 0.ge-6-1-6.gw3.equinix-sj  0.0%    20    4.9   6.0   4.6  14.6   2.7
  5.|-- 10gigabitethernet2-3.core  0.0%    20    6.2   9.2   5.2  16.8   3.9
  6.|-- pacnet.10gigabitethernet2  0.0%    20    4.6   5.0   4.3  10.2   1.3
  7.|-- gi9-0-0.cr2.nrt1.asianetc  0.0%    20  118.1 117.9 117.0 118.2   0.3
  8.|-- ge-2-1-0-0.gw3.nrt5.asian  0.0%    20  117.2 117.2 117.1 118.3   0.3
  9.|-- GMO-0003.gw3.nrt5.asianet  0.0%    20  118.7 118.8 118.7 119.0   0.1
 10.|-- c7-e-1-1.interq.or.jp      0.0%    20  117.8 117.9 117.7 119.0   0.3
 11.|-- g-pb1-e-0-1.interq.or.jp   0.0%    20  120.4 126.2 118.4 181.0  13.6
 12.|-- lb04.virt.lolipop.jp       5.0%    20  118.5 118.5 118.4 118.7   0.1

I tried again with 1400-byte packets and it only added ~3ms to the round-trip times at the last hop, so I have to take Speedtest.net's latency numbers with a grain of salt. That said, it sounds like a real problem is happening somewhere on the route between ladr's connestion and the land of the rising sun, and a trace would be of great help in tracking it down.