Slow NFS writes with sec=krb5

[Florian Oppermann]

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On 05.10.2015 17:25, Brandon Vincent wrote:
> There was an issue with the system detecting if gssd was running,
> so my only recommendation to you is to update to the latest kernel
> and NFS/Kerberos related packages and see if that resolves your
> issue.

I just tried the following things:

1) On one slow machine that is running precise I booted into an old
kernel image (3.2 instead of 3.13). The behaviour was the expected:
The kerberized automount got fast write speeds. Booting back to 3.13
made it slow again.

I think this rules out the possibility that some other packages have
broken something and should be upgraded.

2) On one of our trusty machines I installed the .debs for 4.0.0,
4.1.0, 4.2.3 and 4.3.0 from
<http://kernel.ubuntu.com/~kernel-ppa/mainline/>. None of the new
kernels enabled the fast kerberized NFS automount.

I suspected them to solve the issue because my laptop with Debian
testing had fine write performance. I have to check the kernel version
though.

Maybe we’ll just try to setup one machine with a clean 15.10 when it’s
released.

Best regards,
Florian
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