On Mon, 25 Nov 2013, Pavel Levshin wrote:

23.11.2013 7:01, Erik Steffl:

Another possibly interesting message is:

7975.038523942:7fe2064cf700: main Q: doEnqSingleObject: LightDelay mark reached for light delayable message - blocking a bit.

which was received approximately once per second during following interval (this is also when the traffic went down to zero):

1385087975 Fri Nov 22 02:39:35 UTC 2013
1385088546 Fri Nov 22 02:49:06 UTC 2013

Does this shed any light on what's going on?

I bet this is the problem. This blocks main queue for a second.

There are possible workarounds, including increasing main queue size (this watermark is set to 70% by default).

what triggers this happening.

and why would a delay block the main queue instead of just the input that triggers it?

David Lang
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