Re: Re: CPU Hog
By: Tracker1 to deon on Sat Aug 06 2022 06:20 pm
> What did your RAM usage look like? I've seen a similar issue a couple
> times, where I couldn't connect on the mail service port... I don't know
> what part of Synchronet was causing the issue... there was definitely
> some kind of memory leak as I was getting a lot of out of memory errors.
Yeah, I am confident RAM wasnt the issue.
I've been running the same container config for 2+ years now, with the only diff
erent being an image update every now and again. (I can see from docker stats, t
hat its happy with 168MB of 2G available to it.)
The problem started when I switched to a new ISP, that uses PPPoE. As a result a
ll of my IPv6 traffic was affected by the lower MTU, and while I addressed that
for my server LAN, I'm assuming it is affecting the docker lan (havent definitiv
ely confirmed that yet, but it seems likely).
Resetting the host (and the container) saw the CPU get back to 100% after a shor
t while (with my fido hub trying to deliver me mail over IPv6). When he switched
to IPv4, problem disappeared and CPU stays normal (< 5%).
My initial report of this was due to the fact that when I polled him with binkit
, it didnt time out after 5 minutes (which IIRC is the "normal" timeout - and I
'm assuming since he is using binkd his side would have) and I was thinking that
subsequent binkit -p polls were "adding" to the issue (together with him pollin
g me as well).
(And I dont think my side would have closed down when his side sent the TCP_FIN
as a result of the binkd timeout, since there was (probably) other defragged pac
kets that werent successfully delivered yet.)
What's also strange, I've learnt that his side is also PPPoE, and I was only hav
ing this issue with his system - my other IPv6 connections were not affected.
Not sure why a hung poll would also peg 2 cores as technically my side is waitin
g to receive - perhaps the repeated system call to check if there is data on the
wire does result in this?
...δεσ∩
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