-----Original Message----- From: linux-ide-owner@xxxxxxxxxxxxxxx [mailto:linux-ide-owner@xxxxxxxxxxxxxxx] On Behalf Of Matthew Wilcox Sent: Wednesday, December 10, 2008 11:40 PM To: Raz Ben-Yehuda Cc: linux-ide@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx Subject: Re: Intel X25-M MLC SSD benchmarks On Wed, Dec 10, 2008 at 11:15:12PM +0200, Raz Ben-Yehuda wrote: > Hello > I am wondering if anyone tried Intel new disks. I benchmark them and I > am a bit confused. > According to the spec a single disk should provide 70MB/s write and 250 > MB/s read. Reads are ok. I am reaching this number, but writes are bad. > With writes I am getting 20MB/s. > I am using a dd for the test, and a deadline-line scheduler. What command exactly are you using, and have you tried using the no-op elevator instead of deadline? Also, what controller is it hooked up to? I first thank you for your reply. I did not want to dive into details because it does not matter. Whether noop,deadline, deadline parameters... As for the controller I used 4 different controllers. Adaptec,AHCI and Intel as Integrated chips on the 1025W-UR supermicro motherboard, and a 4-th controller SuperMicro UIO Adaptec aac card. All gave same results for most dd writes commands. dd if=/dev/zero of=/dev/sda bs=1M count=1000 oflag=direct , and many other variants such erase block size ( 128K ) , several erase block size and so on. Kernel is 2.6.18-8.el5. I used all on a supermicro 1025W-UR. Disks have a SAS interface, 80GB. Also, I would like to note, I have 8 disks in array, while each one perform READS 250 MB/s, together I degrade to 200 MB/s each. As for writes I always reach 20 MB/s at best, from a single disk or 20x8 in array. A disk in /proc/scsi/scsi identifies like this: Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: INTEL SSDSA2MH08 Rev: 045C Type: Direct-Access ANSI SCSI revision: 05 And this is how my poor iostat looks: avg-cpu: %user %nice %system %iowait %steal %idle 0.00 0.00 0.13 24.78 0.00 75.09 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn hda 0.00 0.00 0.00 0 0 sda 33.00 0.00 11136.00 0 11136 sdb 126.00 0.00 42624.00 0 42624 sdc 87.00 0.00 29568.00 0 29568 sdd 122.00 0.00 41728.00 0 41728 sde 121.00 0.00 41344.00 0 41344 sdf 121.00 0.00 41448.00 0 41448 sdg 109.00 0.00 36736.00 0 36736 sdh 48.00 0.00 49152.00 0 49152 and this is lspci: 00:00.0 Host bridge: Intel Corporation 5400 Chipset Memory Controller Hub (rev 20) 00:01.0 PCI bridge: Intel Corporation 5400 Chipset PCI Express Port 1 (rev 20) 00:03.0 PCI bridge: Intel Corporation 5400 Chipset PCI Express Port 3 (rev 20) 00:05.0 PCI bridge: Intel Corporation 5400 Chipset PCI Express Port 5 (rev 20) 00:07.0 PCI bridge: Intel Corporation 5400 Chipset PCI Express Port 7 (rev 20) 00:09.0 PCI bridge: Intel Corporation 5400 Chipset PCI Express Port 9 (rev 20) 00:0f.0 System peripheral: Intel Corporation 5400 Chipset QuickData Technology Device (rev 20) 00:10.0 Host bridge: Intel Corporation 5400 Chipset FSB Registers (rev 20) 00:10.1 Host bridge: Intel Corporation 5400 Chipset FSB Registers (rev 20) 00:10.2 Host bridge: Intel Corporation 5400 Chipset FSB Registers (rev 20) 00:10.3 Host bridge: Intel Corporation 5400 Chipset FSB Registers (rev 20) 00:10.4 Host bridge: Intel Corporation 5400 Chipset FSB Registers (rev 20) 00:11.0 Host bridge: Intel Corporation 5400 Chipset CE/SF Registers (rev 20) 00:15.0 Host bridge: Intel Corporation 5400 Chipset FBD Registers (rev 20) 00:15.1 Host bridge: Intel Corporation 5400 Chipset FBD Registers (rev 20) 00:16.0 Host bridge: Intel Corporation 5400 Chipset FBD Registers (rev 20) 00:16.1 Host bridge: Intel Corporation 5400 Chipset FBD Registers (rev 20) 00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 (rev 09) 00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #2 (rev 09) 00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #3 (rev 09) 00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #4 (rev 09) 00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI USB2 Controller (rev 09) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9) 00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC Interface Controller (rev 09) 00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev 09) 00:1f.2 RAID bus controller: Intel Corporation 631xESB/632xESB SATA RAID Controller (rev 09) 00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus Controller (rev 09) 01:00.0 Ethernet controller: Intel Corporation 82598EB 10 Gigabit AT CX4 Network Connection (rev 01) 01:00.1 Ethernet controller: Intel Corporation 82598EB 10 Gigabit AT CX4 Network Connection (rev 01) 02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port (rev 01) 02:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X Bridge (rev 01) 03:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E1 (rev 01) 06:00.0 RAID bus controller: Adaptec AAC-RAID (rev 09) 07:00.0 Ethernet controller: Intel Corporation 82598EB 10 Gigabit AT CX4 Network Connection (rev 01) 07:00.1 Ethernet controller: Intel Corporation 82598EB 10 Gigabit AT CX4 Network Connection (rev 01) 08:00.0 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02) 08:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02) 09:01.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02) [ -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
