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

Sean LeBlanc seanleblanc at comcast.net
Sat Apr 30 09:31:27 MDT 2016


To answer my own question, re-run VMware tools config, and reboot. 

> On Apr 29, 2016, at 11:14 PM, Sean LeBlanc <seanleblanc at comcast.net> wrote:
> 
> 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
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