Slow write performance on internal SSD disk

1

=================

I am facing the following issue:

my SSD Samsung EVO 850 is leaving me with terribly slow write performance.

I am getting only approx. 150 MB/s, many times it is worse than that. I would expect much more higher write output.

dd if=debian-8.2.0-amd64-CD-1.iso of=testfile bs=1M count=1024 conv=fdatasync,notrunc

627+0 records in
627+0 records out
657457152 bytes (657 MB) copied, 4.31444 s, 152 MB/s

What I have on my system:

  • linux - Debian - 7.9
  • with kernel version: Linux 3.10.0-13-pve #1 SMP Fri Oct 9 11:36:12 CEST 2015 x86_64 GNU/Linux
  • with Proxmox installed on it with version 3.4-166

I don't know how to see where the issue might be. Using tools like iostat, iotop, dstat, strace did not help at all. I am still stuck.

Any piece of advise really appreciated. Should I analyse that with tool like systemtap?

See please output of lspci command.

00:00.0 Host bridge: Intel Corporation 5520 I/O Hub to ESI Port (rev 13)
00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 1 (rev 13)
00:02.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 2 (rev 13)
00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 3 (rev 13)
00:04.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 4 (rev 13)
00:05.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 5 (rev 13)
00:06.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 6 (rev 13)
00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 7 (rev 13)
00:08.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 8 (rev 13)
00:09.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express Root Port 9 (rev 13)
00:0a.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express Root Port 10 (rev 13)
00:0d.0 Host bridge: Intel Corporation Device 343a (rev 13)
00:0d.1 Host bridge: Intel Corporation Device 343b (rev 13)
00:0d.2 Host bridge: Intel Corporation Device 343c (rev 13)
00:0d.3 Host bridge: Intel Corporation Device 343d (rev 13)
00:0d.4 Host bridge: Intel Corporation 7500/5520/5500/X58 Physical Layer Port 0 (rev 13)
00:0d.5 Host bridge: Intel Corporation 7500/5520/5500 Physical Layer Port 1 (rev 13)
00:0d.6 Host bridge: Intel Corporation Device 341a (rev 13)
00:0e.0 Host bridge: Intel Corporation Device 341c (rev 13)
00:0e.1 Host bridge: Intel Corporation Device 341d (rev 13)
00:0e.2 Host bridge: Intel Corporation Device 341e (rev 13)
00:0e.3 Host bridge: Intel Corporation Device 341f (rev 13)
00:0e.4 Host bridge: Intel Corporation Device 3439 (rev 13)
00:14.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub System Management Registers (rev 13)
00:14.1 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers (rev 13)
00:14.2 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status and RAS Registers (rev 13)
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 1
00:1c.4 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 5
00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
00:1d.3 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation 82801JIB (ICH10) LPC Interface Controller
01:03.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI ES1000 (rev 02)
02:00.0 System peripheral: Hewlett-Packard Company Integrated Lights-Out Standard Slave Instrumentation & System Support (rev 04)
02:00.2 System peripheral: Hewlett-Packard Company Integrated Lights-Out Standard Management Processor Support and Messaging (rev 04)
02:00.4 USB controller: Hewlett-Packard Company Integrated Lights-Out Standard Virtual USB Controller (rev 01)
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
03:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
04:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
05:00.0 RAID bus controller: Hewlett-Packard Company Smart Array G6 controllers (rev 01)
06:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2308 PCI-Express Fusion-MPT SAS-2 (rev 05)
09:00.0 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (rev 02)
09:00.1 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (rev 02)
3e:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture Generic Non-core Registers (rev 02)
3e:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture System Address Decoder (rev 02)
3e:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
3e:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 02)
3e:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 (rev 02)
3e:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 (rev 02)
3e:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
3e:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 02)
3e:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Registers (rev 02)
3e:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Target Address Decoder (rev 02)
3e:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller RAS Registers (rev 02)
3e:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Test Registers (rev 02)
3e:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Control (rev 02)
3e:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Address (rev 02)
3e:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Rank (rev 02)
3e:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Thermal Control (rev 02)
3e:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Control (rev 02)
3e:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Address (rev 02)
3e:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Rank (rev 02)
3e:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Thermal Control (rev 02)
3e:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Control (rev 02)
3e:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Address (rev 02)
3e:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Rank (rev 02)
3e:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Thermal Control (rev 02)
3f:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture Generic Non-core Registers (rev 02)
3f:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath Architecture System Address Decoder (rev 02)
3f:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
3f:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 02)
3f:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 (rev 02)
3f:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 (rev 02)
3f:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
3f:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 02)
3f:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Registers (rev 02)
3f:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Target Address Decoder (rev 02)
3f:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller RAS Registers (rev 02)
3f:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Test Registers (rev 02)
3f:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Control (rev 02)
3f:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Address (rev 02)
3f:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Rank (rev 02)
3f:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 0 Thermal Control (rev 02)
3f:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Control (rev 02)
3f:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Address (rev 02)
3f:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Rank (rev 02)
3f:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 1 Thermal Control (rev 02)
3f:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Control (rev 02)
3f:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Address (rev 02)
3f:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Rank (rev 02)
3f:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory Controller Channel 2 Thermal Control (rev 02)

ivo

Posted 2015-12-29T22:45:58.197

Reputation: 111

Have you tried different bs values >= 4M? Do you still get the same performance? (see this)

– urban – 2015-12-29T22:52:40.880

thanks. I tried to put various values for block size (bs) but I am getting the same result. Yet, very important thing I forgot to mention is I am using ext4 file system with the following mount options: rw,relatime,discard,nobarrier,errors=remount-ro,data=ordered. – ivo – 2015-12-29T22:58:37.090

Not en expert on this... so I am googling it. I see that relatime is good if you dont want to lose data. nobarrier seems a bit dangerous here but improves your IO. discard ... I have no clue!

– urban – 2015-12-30T08:38:41.090

Answers

0

Based on the output you posted, your motherboard has an ICH10 chipset, which is SATA II. So you should be getting read/write around 250/270 or so, close to half the rating of the SSD, which is SATA III. That is what I get on my iMac with the same chipset and a Samsung Pro. Don't expect much more than this.

I am not a Linux expert, but just so you know the limitations of the X58 with ICH10.

Mark

Posted 2015-12-29T22:45:58.197

Reputation: 1

Asked: 2015-12-29T22:45:58.197

Viewed: 362 times

Active: 2015-12-30T22:48:15.923