writeback eats disk I/O

alfrenovsky

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I have a very slow disk. So I tried to increase dirty buffers

/proc/sys/vm/dirty_background_bytes:0
/proc/sys/vm/dirty_background_ratio:50
/proc/sys/vm/dirty_bytes:0
/proc/sys/vm/dirty_expire_centisecs:60000
/proc/sys/vm/dirty_ratio:80
/proc/sys/vm/dirty_writeback_centisecs:500

DDing a 5 GB file and Monitoring dirty memory I can see a 5GB peak and then a constant writeback and the dirty going down.
During the writeback I can hardly do any other thing whith the disk.

There's a way to lower the writeback priority?

I cant the writeback to be "ionice" to other disk requests.
 


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