Messages in this thread | | | Date | Wed, 20 Jun 2007 11:14:04 +0200 | From | Jens Axboe <> | Subject | Re: Change in default vm_dirty_ratio |
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On Wed, Jun 20 2007, Andrew Morton wrote: > Perhaps our queues are too long - if the VFS _does_ back off, it'll take > some time for that to have an effect. > > Perhaps the fact that the queue size knows nothing about the _size_ of the > requests in the queue is a problem.
It's complicated, the size may not matter a lot. 128 sequential 512kb IO may complete faster than 128 random 4kb IO's.
> Back away even further here. > > What user-visible problem(s) are we attemping to fix?
I'd like innocent-app-doing-little-write-or-fsync not being stalled by big-bad-app-doing-lots-of-dirtying.
-- Jens Axboe
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