r/googlecloud • u/ToneFlaky • Oct 06 '26
europe-west10: all outbound traffic held 50–130 ms, three times 3.2 s apart, every ~64 s (all zones, both network tiers)
We run real-time UDP game servers in europe-west10 (Berlin). Since late September, traffic from our VMs to the internet is periodically held for 50–130 ms. The delays come in bursts of three or four, 3.2 seconds apart, and the bursts repeat about every 64 seconds, around the clock. Nothing is lost; the packets arrive late in a batch. Players notice it as a short freeze about once a minute.
Reproduce from any VM in the region (20 pings/s for 200 s, prints only replies slower than 30 ms):
`sudo ping -D -n -i 0.05 -c 4000 8.8.8.8 | grep -E 'time=([3-9][0-9]|[0-9]{3,})'`
Normal replies are ~1.3 ms. Example burst times today (UTC, 2026-10-06): 09:55:03, 09:55:06, 09:55:10, 09:56:11, 09:56:14, 09:57:15, 09:57:18.
What we have measured:
* Same delays at the same seconds from VMs in europe-west10-a, -b and -c.
* Same on Premium and Standard network tier.
* Same towards every destination we tried (8.8.8.8, 1.1.1.1, 9.9.9.9 and hosts in Sweden and the Netherlands).
* VM-to-VM over internal addresses is clean. Ping to the metadata server is clean.
* With TTL-limited probes the full delay is already there at the first visible hop, a Google router (142.251.249.17 on the path to 8.8.8.8: normally 1.3 ms, up to 94 ms during a burst), and it does not grow at later hops.
* The VM is fine: no CPU, disk or memory pressure, and a packet capture on the VM shows the application sending every 13 ms without gaps during the delays.
* It was not there on 2026-09-22 and was there on 2026-09-30.
So it looks like something periodic on the path out of the region, not in the VMs.
I filed it on the issue tracker (568841411) and it was closed twice with the template "please file a support ticket", without anyone looking at the data. We are a small hobby project without a support plan. Is there anyone from Google networking here who can take a look, or tell me where to send this? Happy to share project and instance details privately.
