xchaotic

Poor real life performance of Samsung 950 Pro?

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When I friend was looking for an SSD upgrade, I took advantage of it and sold my 'pedestrian' SATA SSD and replaced it with Samsung 950Pro connected via an adapter in a PCIEx16 slot.

It took some wrangling but the drive is bootable on a Z87 board and is generally working fine.

I ran some benchmark with Crystal DIsk Mark etc and they are more or less in line with reviews.

However, when doing simple tasks, I'm not entirely impressed - for example I recently downloaded a zipped file - a compressed linux image. (650MB uncompressed)

I wanted to unzip to the same folder and saw speed around 2-3MB/s, not exactly what I expected.

The same goes for very small files - something that I'd expect to be instant.

I check the activity monitor and CPU was hardly used, so clearly it is the SSD that's bottlenecking somehow?

Finally I have 24GB RAM so I would expect Windows 10 to take advantage of that to cache recent files in RAM (such as the one I just downloaded)?

Is there a way to investigate what's going on?

I should probably add that while there is no radiator, the SSD is pretty well ventillated and running benchmark for longer indicates that there is no throttling even under have load for at least 10 minutes.

The rest of the system:

CPU i5 3.4GHz quad core

24GB DDR3 #1600Mhz

c: - 256gb Samsung 950 Pro PCIE 3.0 x4

d: 4 way raid-0 - 4 x 500gb Sandisk Ultra II SATA SSD

s: - 3TB backup HDD (nightly backups of d: and some folders on c: using CrashPlan - I temporarily turned it off, but no change)

As you can see I have spare disks attached so I could create an image and perhaps reformat with a different stripe size perhaps?

post-62785-0-12471200-1464784291_thumb.p

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Smells like you're limited somewhere else in the I/O or OS stack for accessing the disk, rather than the disk itself-- since the disk does benchmark just fine, I suspect everything is kosher there.

Obvious test-- do you get better/similar/slower unzip performance with the same file when you do it from your RAID0 of four Ultra II's, doing the exact same operation? (unzip it to the same directory)

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do you get better/similar/slower unzip performance with the same file when you do it from your RAID0 of four Ultra II's, doing the exact same operation? (unzip it to the same directory)

Yup I get instant unzip on the other drive, actually even the HDD is faster, I'll try and get some screenshots after the weekend.

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I turns out the culprit was windows built in unzip:

Straight up copy is super fast:

JaDPXza.png

built in unzip is super slow for some reason:

hrmEfDN.png

I installed 7-zip and that gives me about 100MB/s unrar speed, I will check zip some other time.

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