Messages in this thread | | | Date | Wed, 20 Jun 2007 10:17:40 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: Change in default vm_dirty_ratio |
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On Wed, 20 Jun 2007, Peter Zijlstra wrote: > > Building on the per BDI patches, how about integrating feedback from the > full-ness of device queues. That is, when we are happily doing IO and we > cannot possibly saturate the active devices (as measured by their queue > never reaching 75%?) then we can safely increase the total dirty limit.
The really annoying things are the one-off things. You've been happily working for a while (never even being _close_ to saturatign any IO queues), and then you untar a large tree.
If the kernel now let's you dirty lots of memory, you'll have a very unpleasant experience.
And with hot-pluggable devices (which is where most of the throughput problems tend to be!), the "one-off" thing is not a "just after reboot" kind of situation.
So you'd have to be pretty smart about it.
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