xDS thread processing is slow

[zyfjeff]

Title: xDS thread processing is slow

Description:

The current Envoy xDS processing, Admin handler、socket data reception are the same thread, when encountered with a large cluster, xDS processing is time-consuming, this time will cause the admin interface is not available, can not receive the ping package sent by the grpc server, resulting in the connection is closed by the grpc server.

[mattklein123]

This is a fundamental limitation of Envoy's threading model. It's not that we can't make this better, but it won't be easy and will require some holistic thinking. IMO it's better right now to focus on the inflight proposals to reduce Envoy management CPU (e.g. the IEDS proposal).

cc @jmarantz

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or other activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as "help wanted". Thank you for your contributions.