Messages in this thread | | | Date | Thu, 21 Jun 2007 16:08:11 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: Change in default vm_dirty_ratio |
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On Thu, 21 Jun 2007, Matt Mackall wrote: > > Perhaps we want to throw some sliding window algorithms at it. We can > bound requests and total I/O and if requests get retired too slowly we > can shrink the windows. Alternately, we can grow the window if we're > retiring things within our desired timeframe.
I suspect that would tend to be a good way to go. But it almost certainly has to be per-device, which implies that somebody would have to do some major coding/testing on this..
The vm_dirty_ratio thing is a global value, and I think we need that regardless (for the independent issue of memory deadlocks etc), but if we *additionally* had a per-device throttle that was based on some kind of adaptive thing, we could probably raise the global (hard) vm_dirty_ratio a lot.
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