Re: PSA: If you are running Precise/12.04 upgrade your kernel.

Good to know. I've got a few spare machines I might be able to test
3.2 kernels on in the next few months

On Thu, Jun 20, 2013 at 12:54 PM, Shaun Thomas <sthomas(at)optionshouse(dot)com> wrote:
> On 06/17/2013 04:00 PM, Joshua D. Drake wrote:
>
>>>
>>> http://postgresql.1045698.n5.nabble.com/Ubuntu-12-04-3-2-Kernel-Bad-for-PostgreSQL-Performance-td5735284.html
>>>
>>> tl;dr for that thread seems to be a driver problem (fusionIO?), I'm
>>> unsure if Ubuntu specific or in the upstream kernel.
>
>
> That instance wasn't a driver problem. The problem was that the FusionIO
> driver uses kernel threads to perform IO, and it seems that several of the
> 3.x kernels have issues with task migration using the new CFS CPU scheduler
> which replaced the O(1) one.
>
> The next thread related to this that fixed our particular case was this one:
>
> http://www.postgresql.org/message-id/50E4AAB1.9040902@optionshouse.com
>
> --
> Shaun Thomas
> OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
> 312-676-8870
> sthomas(at)optionshouse(dot)com
>
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