On 25.10.2013 00:12, Lists wrote:
> On 10/24/2013 03:48 PM, Karanbir Singh wrote:
>> On 10/23/2013 10:30 AM, Morgan Cox wrote:
>>> If you want SSD + MDRAID you need to use a 3.8+ kernel to have TRIM.
>>>
>>> The speed difference between the stock 2.6.32 -> 3.10 kernel with
>>> SSD +
>>> MDRAID is insane.
>> has someone quantified what this 'insane' amounts to ?
>
> Going from HDD to SSD's gave us better than a 95% reduction in query
> times for complex queries using PostgreSQL on otherwise identical
> hardware. I wouldn't have believed it had I not seen it directly, for
> myself.
That's great, but it's not an answer to what has been asked.
Have you tried SSD based software raid on stock kernel and on
kernel-ml, have you noticed any big difference?
I guess there should be some difference, software raid is not capable
of TRIM in stock kernel, but I'm also not sure if a newer kernel is all
that's required, perhaps modifications to mdadm tool are also necessary.
Lucian
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