In another word, it specifies how long a dirty buffer in buffer cache can remain dirty.
换句话说，它指定在缓存中赃块能保证多长时间。
In addition, they tell the kernel to flush a dirty buffer after 3 seconds rather than 30, the default.
另外，它们告诉内核每隔3秒而不是30秒(缺省值)刷新“脏”缓冲区。
This parameter determines the threshold percentage of dirty pages in the buffer pool at which page cleaning will be initiated.
这个参数决定缓冲池中脏页的阈值百分比，当脏页达到这个百分比时，就会启动页清除。
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