Messages in this thread | | | Subject | Re: Change in default vm_dirty_ratio | From | Peter Zijlstra <> | Date | Sat, 23 Jun 2007 20:23:50 +0200 |
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On Thu, 2007-06-21 at 16:08 -0700, Linus Torvalds wrote: > > 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.
I just did quite a bit of that:
http://lkml.org/lkml/2007/6/14/437
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