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Re: jessie-backports: linux 4.7 686-pae triggering eth errors, nginx OOM



On Tue, 2016-09-20 at 06:14 +0100, Laurence Parry wrote:
> Whoever handles this (Zumbi?) might want to hold off on making
> linux-image-686-pae in jessie-backports
> ==
> linux-image-4.7.0-0.bpo.1-686-pae-unsigned (or similar)
> 
> I run nginx caches on Debian Jessie which I keep up to date
> with backports kernels. I saw the 4.7 above, so I tried it, but
> I've started seeing a bunch of eth0 errors since then on x86:
> https://dl.dropboxusercontent.com/u/14570328/if_err_eth0-4.7.png

That seems to show a brief but extreme increase in *drops* - presumably
due to memory pressure.

> I have not seen this on our 64-bit systems running 4.7, but
> these have far larger RAM and perhaps less pressure on it.
> 
> I'm also getting OOMs which did not previously
> happen AFAIK, e.g. http://pastebin.com/SFErSKGS
[...]

OOM behaviour should be improved by "mm, oom: prevent premature OOM
killer invocation for high order request" which was included in
version 4.7.4-1.

Ben.

-- 
Ben Hutchings
Experience is directly proportional to the value of equipment
destroyed.
                                                         - Carolyn
Scheppner

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