Re: kernel-4.13.5-200.fc26.x86_64 DNS slowdown?

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On Wed, 2017-10-11 at 21:24 +0800, Ed Greshko wrote:
> On 10/11/17 20:26, Patrick O'Callaghan wrote:
> > I installed the above kernel this morning and immediately experienced
> > very noticeable delays in accessing websites (2 or 3 seconds each
> > time), apparently caused by slow DNS lookups. The same happened when
> > running a 'ping' from the Shell, so I don't think the browser (Chrome) 
> > is to blame.
> >
> > Rebooting with 4.13.4-200.fc26.x86_64 fixed the problem immediately.
> >
> > Anyone else notice this?
> 
> Examples of the sites you've tried?  Whose DNS server are you using?   If your ISP,
> can you change to 8.8.8.8 (google's servers)?

Popular sites such as www.nytimes.com and www.theguardian.com. I took a
look at my router's config and saw that its DNS setting was set to
"dynamic". I assume that means uPnP or DHCP but I don't know where it
was pointing at. I changed it to 8.8.8.8 and 8.8.4.4 and rebooted the
new kernel. It seems to have improved but I'll keep an eye on it.

I don't see how a change of kernel could have affected this, unless
there's some subtlety in uPnP (or DHCP), but we'll see.

poc
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