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7f8bb428d3
The existing policy sets dirty_background_bytes to 5, which is erroneously too small that incurs write amplification and read starvations. Considering a raspi with 2 GiB of RAM, this is 43 million times smaller than the default Linux policy, which is 10%. Considering that this will be deployed to mostly read-only system with emphasis on data integrity (hence needing tighter data writeback), set this to 256 KiB. Continuing addressing the overly excessive data writeback policies, also bump the dirty_writeback_centisecs from 250ms to 1000ms. Any dirty data written in the past 1 second will be written to the storage. Signed-off-by: Juhyung Park <qkrwngud825@gmail.com>