[clue] Ubuntu update to 14.04 LTS kernel = network wonkiness?

[Sean LeBlanc]

Had to update Apache in order to do some basic patch duty. For whatever 
reason, Apache had kernel upgrade as dependency. So I had a VM snapshot 
taken, and took the plunge. Upgrade seemed to go fine: same with reboot, 
and apache got updated, too.


Then...we started noticing some problems, and they give all the 
appearance of being because of timeouts we get from network being very, 
very laggy. Our tool uses dependency management based on Maven, and that 
relies on networking, and apparently it is timing out when trying to 
reach websites.


Anyone else experience anything like this? New Ubuntu kernel is 
3.19.0-58-generic.

Any things to try out?


Another odd symptom that may be a clue for someone that has seen this 
before is that if I have a long-running ssh session I haven't used in a 
while, it takes a bit to "wake up"? I don't think I've noticed this 
before on this box.


For an example of what "slow" means, doing time curl 
https://build.shibboleth.net/nexus/content/repositories/releases/ on 
this box takes 23.6 seconds. On another machine within same environment, 
it takes about 0.04s.

I don't think anything else on network has changed (though I will be 
asking around) and this started happening immediately after restart, so 
it seems the kernel upgrade and this behavior are related. Do kernel 
upgrades on Ubuntu typically change anything related to network?


Cheers,

Sean