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hfournier

Slow SSD write performance

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hfournier

I have an N40L with a Plextor M5Pro 256GB SSD as the OS drive. I ran AS SSD Benchmark against it and although I don't fully understand what all the results represent, I'm seeing what looks like pretty horrible 4K write speeds and write access time.

 

Please see attached XML file (pasting the XML in the message didn't work very well).

 

For comparison, I ran the same test on the SanDisk Extreme 120GB drive in my Dell XPS 17 running Win8 Pro:

 

Please see attached XML file.

 

Thoughts?

 

Henri

as-ssd-bench SanDisk SDSSDX120GG25 2013-02-22 9-31-28 AM.xml

as-ssd-bench PLEXTOR PX-256M5Pro 2013-02-22 9-34-45 AM.xml

Edited by hfournier

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hfournier

Only one file attached to my first post, even though there are two file upload boxes. I tried to edit the post and add the other file, but I still only see one file. So I've added it here. Hopefully, it works this time.

 

Nope, it appears that only the second file upload box works. I tried to delete this reply, but nothing happens when I click Delete.

as-ssd-bench PLEXTOR PX-256M5Pro 2013-02-22 9-34-45 AM.xml

Edited by hfournier

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cskenney

Have you found AS SSD results for your drive any place else?  When I look at your results and then look at other results I can find on the internet I am not sure what a good drive vs bad drive really is.

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schoondoggy

I would recommend Crystal disk mark to bench mark your drives.

You will see a difference between your two systems due to SATA ports. I think your Dell is SATA III and the N40L is SATA II.

 

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hfournier

Yes, I agree. I don't know enough about drives to analyze the results, but I'm pretty sure that a 4K random write speed of 2.27 MB/s is bad.

 

I found this page on the Plextor site:

http://www.plextoramericas.com/index.php/ssd

so I ran the CrystalDiskMark test against my drive and didn't get anywhere near those results:

 

* MB/s = 1,000,000 byte/s [sATA/300 = 300,000,000 byte/s]

 

Sequential Read : 249.869 MB/s

Sequential Write : 139.661 MB/s

Random Read 512KB : 208.880 MB/s

Random Write 512KB : 89.799 MB/s

Random Read 4KB (QD=1) : 14.764 MB/s [ 3604.4 IOPS]

Random Write 4KB (QD=1) : 2.382 MB/s [ 581.6 IOPS]

Random Read 4KB (QD=32) : 118.075 MB/s [ 28826.9 IOPS]

Random Write 4KB (QD=32) : 56.886 MB/s [ 13888.1 IOPS]

 

Test : 1000 MB [C: 16.9% (40.1/238.1 GB)] (x5)

Date : 2013/02/22 11:45:56

 

OS : Windows Server 2012 [6.2 Build 9200] (x64)

 

 

Looking at Device Manager, the driver for Standard SATA AHCI Controller is the default Microsoft 2006-06-21 6.2.9200.16384

 

The HP site does not seem to have a proper driver for the controller.

 

I'm wondering if I need a proper driver to get better performance?

 

PS: The auto-reformatting in this forum sucks.

Edited by hfournier

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schoondoggy

The specs from Plextor are running at SATA III speeds. The N40L is SATA II, the read speed of 249MB is about the best you can get on SATA II.

Your write performance does look low, I would have expected it to be around 225MB.

Run Crystal on your Dell, I am curious about those numbers. If this is a new Dell it will be SATA III and the SanDisk SSD is SATA III so you should see around 550MB read and 510MB write.

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hfournier

Yes, of course, you're right about the SATA II vs SATA III. I should have thought of that. However, I don't think that explains the difference in Random Write 4KB speed.

 

Dell XPS 17 with SanDisk Extreme 120GB

Random Write 4KB (QD=1) : 52.690 MB/s [ 12863.8 IOPS]

 

N40L with Plextor PX-256M5Pro

Random Write 4KB (QD=1) : 2.382 MB/s [ 581.6 IOPS]

 

 

CrytalDiskMark results on my Dell (not quite as fast as you thought):

 

* MB/s = 1,000,000 byte/s [sATA/300 = 300,000,000 byte/s]

 

Sequential Read : 400.220 MB/s

Sequential Write : 131.056 MB/s

Random Read 512KB : 359.113 MB/s

Random Write 512KB : 127.602 MB/s

Random Read 4KB (QD=1) : 16.807 MB/s [ 4103.2 IOPS]

Random Write 4KB (QD=1) : 52.690 MB/s [ 12863.8 IOPS]

Random Read 4KB (QD=32) : 108.465 MB/s [ 26480.6 IOPS]

Random Write 4KB (QD=32) : 128.157 MB/s [ 31288.3 IOPS]

 

Test : 1000 MB [C: 86.9% (96.8/111.4 GB)] (x5)

Date : 2013/02/22 12:23:58

OS : Windows 8 Enterprise Edition [6.2 Build 9200] (x64)

Edited by hfournier

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schoondoggy

When I get home tonight I will run some benchmarks to compare.

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cskenney

Do you have the SSD in the N40L plugged into one of the 4 drive cage slots or have you attached it to the onboard SATA connector?

 

Edit - Is your N40L using the stock BIOS?

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hfournier

I mostly copied Joe_Miner's build. The SSD is in an IcyDock in the ODD bay.

 

And no, I'm using the BIOS-MOD.

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