On Thu, Sep 14, 2017 at 10:46:12AM +0200, Paul Reeves wrote:
>
> Your figures show that FB3 and Kernel 4.1.12 was the slowest
> combination.
>
> Although it is interesting to see that FB 4 Alpha 1 is performing
> better than FB 3.0.3.
>
> Anyway, if I understand correctly the issue is with the kernels, not
> firebird. Have you tried other kernels from other distros ? ( 4.1 is
> getting old, now - the latest is 4.12, I think. )
It's a bit more complicated. Latest release is 4.13 since few days ago
but most distributions - and in particular those targeted for server use
- have something older. E.g. RHEL7 has 3.10, SLES12 3.12 (GA and SP1) or
4.4 (SP2 and SP3). And there are even SLES11 SP4 (3.0) or RHEL6
(2.6.32). On the other hand, version itself may not be sufficient as
those kernels often have many backports that can affect performance
quite a lot.
What would be interesting would be using e.g. perf to identify where
does the difference between kernel versions come from (assuming kernel
is indeed the only different component between two tests).
Michal Kubecek
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