PNY SSD problem

Abazid

Reputable
Jun 20, 2014
11
0
4,510
Hello guys

i bought 2 120gb PNY XLR8
i installed one on lenovo g580
and the other one on hp pavillion g6
and the performance is not as described
i tested the speed and they only give for the lenovo 300/100 mb/s
and the hp is slightly higher

it is written that this ssd should give at least 400/400
so where is the problem ?
 
Solution
Well, as for the Lenovo, the G580 only has a SATA II controller (implied by http://shop.lenovo.com/ISS_Static/ww/wci/products/us/laptop/essential/g-series/g580/G580_Datasheet.pdf which simply says "SATA I and II [SATA III compatible]" and confirmed by the user's dmesg output in http://askubuntu.com/questions/330130/change-disk-ssd-how-check-which-sata-version-is-supported [note the answer interprets incorrectly, and that machine has no SATA III controller]); so you're limited to about 350 MB/sec burst rates anyways (mind you that's burst, not continuous).

jasonc2

Reputable
May 26, 2014
19
0
4,520


Careful about blindly following those tips; don't disable functionality that you use. Some of those things don't actually affect general performance, they only add high load at certain times.

The following steps affect continuous performance: 1, 2, 16
The following steps are important or critical for reliability: 5, 6, 15
The following steps only reduce load at specific times: 3, 4, 9, 10
The following steps have nothing to do with SSDs, or are a big sacrifice; recommend against: 7, 11, 12, 13, 14, 18
The following steps are questionable: 8, 17

Notes:
4 - Disable indexer: The indexer runs fairly often sometimes, so this may blend with "continuous performance".
6 - Disable page file: Do this unless you actually need it because you run out of RAM (unlikely).
7 - Disable hibernation: Probably don't want to disable this on a laptop.
8 - If you disable write-caching, research it first, and also look into write cache buffer flushing. This affects data integrity on sudden power loss.
10 - You could disable superfetch but don't disable search if you use it.
16 - Note that switching to high performance mode sacrifices battery life when not plugged in.
17 - Clearing the page file is irrelevant if you've done step 6
18 - Total BS http://www.tweakhound.com/2009/12/11/ntfsmemoryusage2-tweak/

Always research these tweaks first. I hate this particular list, people post it a lot but most of it, particularly step 11 and after, is full of crap, or at least lacking explanation. Articles like that are why mailing lists are full of people complaining that their programs stopped working when they compiled everything with -funroll-loops.
 

Abazid

Reputable
Jun 20, 2014
11
0
4,510
i want to know why it works slow out of the box
is there is something wrong with my laptops
or they are performing pad ?
these fixes will only increase the performance a bit
so no need for them
thanks for the help btw
 

jasonc2

Reputable
May 26, 2014
19
0
4,520
Well, as for the Lenovo, the G580 only has a SATA II controller (implied by http://shop.lenovo.com/ISS_Static/ww/wci/products/us/laptop/essential/g-series/g580/G580_Datasheet.pdf which simply says "SATA I and II [SATA III compatible]" and confirmed by the user's dmesg output in http://askubuntu.com/questions/330130/change-disk-ssd-how-check-which-sata-version-is-supported [note the answer interprets incorrectly, and that machine has no SATA III controller]); so you're limited to about 350 MB/sec burst rates anyways (mind you that's burst, not continuous).
 
Solution