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I recently purchased a 256gb samsung 830 SSD. It's plugged into a SATA3 port, bios settings are correct (I tried lots of different combinations anyway), I followed the directions given here, the cable is the one that came with the mobo and the southbridge is definitely not overloaded.
Here are my benchmarks:
# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 4194 MB in 2.00 seconds = 2097.01 MB/sec
Timing buffered disk reads: 732 MB in 3.01 seconds = 243.35 MB/sec
dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 3.05939 s, 351 MB/s
# echo 3 > /proc/sys/vm/drop_caches
# dd if=tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.20608 s, 487 MB/s
dd if=tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 0.449711 s, 2.4 GB/s
Compared to these benchmarks for the same drive, you can see that it's not keeping up.
Here's my specs in case it helps:
# inxi -F
System: Host: skynet Kernel: 3.6.3-1-ARCH x86_64 (64 bit) Desktop: KDE 4.9.2 Distro: Arch Linux
Machine: Mobo: Gigabyte model: GA-890GPA-UD3H Bios: Award version: FD date: 07/23/2010
CPU: Quad core AMD Athlon II X4 645 (-MCP-) cache: 2048 KB flags: (lm nx sse sse2 sse3 sse4a svm)
Clock Speeds: 1: 800.00 MHz 2: 800.00 MHz 3: 800.00 MHz 4: 800.00 MHz
Graphics: Card: NVIDIA GF100 [GeForce GTX 480] X.org: 1.13.0 driver: nvidia tty size: 176x41 Advanced Data: N/A for root
Audio: Card-1: NVIDIA GF100 High Definition Audio Controller driver: snd_hda_intel Sound: ALSA ver: 1.0.25
Card-2: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) driver: snd_hda_intel
Network: Card-1: Realtek RTL-8185 IEEE 802.11a/b/g Wireless LAN Controller driver: rtl8180
IF: wlan0 state: down mac: 00:e0:46:10:01:d9
Card-2: Realtek RTL8111/8168B PCI Express Gigabit Ethernet controller driver: r8169
IF: eth0 state: up speed: 100 Mbps duplex: full mac: 1c:6f:65:37:95:bd
Drives: HDD Total Size: 3256.6GB (36.2% used) 1: id: /dev/sda model: SAMSUNG_SSD_830 size: 256.1GB
2: id: /dev/sdb model: GoFlex_Desk size: 3000.6GB
Partition: ID: / size: 235G used: 51G (23%) fs: ext4
Sensors: System Temperatures: cpu: 35.5C mobo: N/A gpu: 67C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 158 Uptime: 2:22 Memory: 1100.6/7988.2MB Client: Shell inxi: 1.8.20
What can I do about this? Any help is appreciated.
Last edited by Valvar (2012-11-01 18:28:25)
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There are a number of factors that can influence the speed of an SSD. So simply specifying your SSD along and no other mention of harware (besides that it is connected to a SATAIII port) is probably nto enough information to really get you anywhere with this question.
Edit: BTW, I dind't know that page existed... I also didn't realize how much my Kingston Hyper 3k kicks some ass. Also, my Mushkin mSATA Atlas 120GB does pretty damn well for being on a SATA II port. I'll have to do the tests a couple more times in order to get an average to contribute. But inital test went quite well.
Last edited by WonderWoofy (2012-11-01 18:50:46)
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Sorry, I edited my post and added my hardware info.
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These are clearly SATA 3 speeds, because practical speeds with SATA 2 do not exceed 270 MiB/s.
I'd run fstrim on the device. That should improve the result.
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These are clearly SATA 3 speeds, because practical speeds with SATA 2 do not exceed 270 MiB/s.
I'd run fstrim on the device. That should improve the result.
Make a daily or weekly cronjob for fstrim!
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Maybe partition alignment?
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@Stalafin, out of curiosity, do you prefer to use a fstrim cronjob rather than mouting with discard? I ask because I just always mount with discard, but recently I read that this can slightly degrade fielsystem performance while offering very little benefit with improved garbage collection by newer ssd's.
BTW, @OP, I just got a Samsung 830 and it is pretty awesome. Not actually using it yet, but I tested it out, and I like it. I think your speeds are definitely SATA III, as technolog pointed out, they are faster than the capabilities of SATA II. I didn't run these tests on the 830, so I don't know how mine would have compared.
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Thanks guys. fstrim definitely improved the performance. Not quite at the benchmarks I've seen from others, but not too shabby now.
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