fio-buffer Intel Xeon E3-1220 v3 testing on Gentoo/Linux via the Phoronix Test Suite. ssd: Processor: Intel Xeon E3-1220 v3 @ 3.50GHz (4 Cores), Motherboard: Supermicro X10SLL-F v1.02, Memory: 16384MB, Disk: 2 x 32GB SATA SSD + 4 x 1000GB Seagate ST1000NM0045 OS: Gentoo/Linux, Kernel: 4.4.26-gentoo-test (x86_64), Compiler: GCC 4.9.3, File-System: ext4, Screen Resolution: 800x600 Flexible IO Tester 2.1.13 Type: Random Read - IO Engine: Libaio - Buffered: No - Direct: No - Block Size: 4KB - Disk Target: Default Test Directory - Result: MB/s MB/s > Higher Is Better ssd . 343.37 |================================================================= Flexible IO Tester 2.1.13 Type: Random Read - IO Engine: Libaio - Buffered: No - Direct: Yes - Block Size: 4KB - Disk Target: Default Test Directory - Result: MB/s MB/s > Higher Is Better ssd . 343.49 |================================================================= Flexible IO Tester 2.1.13 Type: Random Read - IO Engine: Libaio - Buffered: Yes - Direct: No - Block Size: 4KB - Disk Target: Default Test Directory - Result: MB/s MB/s > Higher Is Better ssd . 41.64 |================================================================== Flexible IO Tester 2.1.13 Type: Random Read - IO Engine: Libaio - Buffered: Yes - Direct: Yes - Block Size: 4KB - Disk Target: Default Test Directory - Result: MB/s MB/s > Higher Is Better ssd . 41.41 |==================================================================