Messages in this thread | | | Subject | Re: [patch 1/3] fix illogical behavior in balance_dirty_pages() | From | Peter Zijlstra <> | Date | Mon, 26 Mar 2007 15:30:27 +0200 |
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On Mon, 2007-03-26 at 02:08 -0800, Andrew Morton wrote: > On Mon, 26 Mar 2007 11:32:47 +0200 Miklos Szeredi <miklos@szeredi.hu> wrote: > > > Stopping writers which have idle queues is completely unproductive, > > and that is basically what the current algorithm does. > > This is because the kernel permits all of its allotment of dirty+writeback > pages to be dirty+writeback against a single device. > > A good way of solving the one-device-starves-another-one problem is to > dynamically adjust the per-device dirty+writeback levels so that (for > example) if two devices are being written to, each gets 50% of the > allotment.
This is exactly what happens with my patch if both devices write at the same speed. (Or at least, that is what is supposed to happen ;-)
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