March 2015
M T W T F S S
 1
2345678
9101112131415
16171819202122
23242526272829
3031  

Categories

March 2015
M T W T F S S
 1
2345678
9101112131415
16171819202122
23242526272829
3031  

Linux Disk Caching & Performance with vm.dirty_ratio & vm.dirty_background_ratio

we talked about how the memory on a Linux guest is used for the OS itself (the kernel, buffers, etc.), applications, and also for file cache. File caching is an important performance improvement, and read caching is a clear win in most cases, balanced against applications using the RAM directly. Write caching is trickier. The […]

Linux OS Tuning/Optimizations

High i/o wait tuning for File Servers

Under “Server”?“General” tab, change “Priority” configuration to “-19”. Process priority can be set from -19 to 20, -19 is the highest, 20 is the lowest.

Change to ‘deadline’ I/O scheduler

From command line (change the device ‘sda’ to appropriate device): echo “deadline” > /sys/block/sda/queue/scheduler kernel parameter, change /boot/grub/menu.lst, […]