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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. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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