Messages in this thread | | | Date | Wed, 5 Sep 2007 01:54:28 -0700 (PDT) | From | Martin Knoblauch <> | Subject | Re: huge improvement with per-device dirty throttling |
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--- Andrea Arcangeli <andrea@suse.de> wrote:
> On Wed, Aug 22, 2007 at 01:05:13PM +0200, Andi Kleen wrote: > > Ok perhaps the new adaptive dirty limits helps your single disk > > a lot too. But your improvements seem to be more "collateral > damage" @) > > > > But if that was true it might be enough to just change the dirty > limits > > to get the same effect on your system. You might want to play with > > /proc/sys/vm/dirty_* > > The adaptive dirty limit is per task so it can't be reproduced with > global sysctl. It made quite some difference when I researched into > it > in function of time. This isn't in function of time but it certainly > makes a lot of difference too, actually it's the most important part > of the patchset for most people, the rest is for the corner cases > that
> aren't handled right currently (writing to a slow device with > writeback cache has always been hanging the whole thing).
didn't see that remark before. I just realized that "slow device with writeback cache" pretty well describes the CCISS controller in the DL380g4. Could you elaborate why that is a problematic case?
Cheers Martin
------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de - 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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