Re: Turn off Hyperthreading! WAS: 60 core performance with 9.3

On Thu, Aug 21, 2014 at 5:29 PM, Josh Berkus <josh@agliodbs.com> wrote:
> On 08/21/2014 04:08 PM, Steve Crawford wrote:
>> On 08/21/2014 03:51 PM, Josh Berkus wrote:
>>> On 08/21/2014 02:26 PM, Scott Marlowe wrote:
>>>> I'm running almost the exact same setup in production as a spare. It
>>>> has 4 of those CPUs, 256G RAM, and is currently set to use HT. Since
>>>> it's a spare node I might be able to do some testing on it as well.
>>>> It's running a 3.2 kernel right now. I could probably get a later
>>>> model kernel on it even.
>>> You know about the IO performance issues with 3.2, yes?
>>>
>> Were those 3.2 only and since fixed or are there issues persisting in
>> 3.2+? The 12.04 LTS release of Ubuntu Server was 3.2 but the 14.04 is 3.13.
>
> The issues I know of were fixed in 3.9.
>
I thought they were fixed in 3.8.something? We're running 3.8 on our
production servers but IO is not an issue for us.