Re: [gentoo-user] SSD performance tweaking

[Michael Mol]

On Thu, Aug 23, 2012 at 4:38 PM, Mark Knecht <markknecht@×××××.com> wrote:
> On Thu, Aug 23, 2012 at 12:30 PM, Michael Mol <mikemol@×××××.com> wrote:
>> On Thu, Aug 23, 2012 at 3:22 PM, Neil Bothwick <neil@××××××××××.uk> wrote:
> <SNIP>
>>> If you want real performance from SSD, you ditch SATA altogether and use
>>> a drive on a dedicated card. Of course, you're talking real money now.
>>
>> Um. I'm pretty sure he's already getting 'real' performance from that
>> SSD, even a "mere" 200MB/s runs circles around my best set of platters
>> at home.
>
> Real performance being the combination of drive and controller. This
> particular drive was spec'ed out at 500MB/S which is consistent with
> what the drive did in that link I pointed at earlier this morning.
>
> I do think now that 200MB/S is about the most I'm going to get from a
> 1 lane PCIe type adapter. I suspect that the biggest reason the link
> you pointed me toward at NewEgg is spec'ed at 1GB/S is due to it being
> a 4 lane card?
>
> Anyway, thanks for the pointer.

I linked to a category of products; Internal SSDs which directly
connect via PCIe. Currently 27 listings in that category. Lots of neat
stuff.

As for systemic performance...I'm certain your controller being only
one PCIe lane is a major limiting factor. Beyond that, there are a lot
of factors which weigh into SSD performance...which at least a few
people in here (such as Neil) can tell you about. I only know things
like SLC is often faster than MLC, that the on-drive controller's
properties can have a major impact, and that SSDs are mostly awesome
due to low latency.

-- 
:wq