URL:
Reporter RHNID:
Section: -
Language: en-US (English)|
Workaround:

Description: In: "Tuning cached page writes"

vm.dirty_expire_centisecs=500, and vm.dirty_writeback_centisecs=100

Every one-tenth of a second (100 centiseconds), the system will check to see if pages have expired and need to be flushed to the I/O subsystem. Lastly, pages expire from cache after .5 seconds (500 centiseconds).

Actually it should be 1 second and 5 second.
To compare, you can take a look at: "Power-saving strategies"

The /proc/sys/vm/dirty_writeback_centisecs file controls how often, in one-hundredths of a second, the kernel will wake up to flush all dirty pages to disk. The default in Red Hat Enterprise Linux 7 is 500, or 5 seconds.