Messages in this thread | | | Subject | Re: Swappiness vs. mmap() and interactive response | From | Peter Zijlstra <> | Date | Tue, 28 Apr 2009 09:48:39 +0200 |
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On Tue, 2009-04-28 at 14:35 +0900, KOSAKI Motohiro wrote: > (cc to linux-mm and Rik) > > > > Hi, > > > > So, I just set up Ubuntu Jaunty (using Linux 2.6.28) on a quad core phenom box, > > and then I did the following (with XFS over LVM): > > > > mv /500gig/of/data/on/disk/one /disk/two > > > > This quickly caused the system to. grind.. to... a.... complete..... halt. > > Basically every UI operation, including the mouse in Xorg, started experiencing > > multiple second lag and delays. This made the system essentially unusable -- > > for example, just flipping to the window where the "mv" command was running > > took 10 seconds on more than one occasion. Basically a "click and get coffee" > > interface. > > I have some question and request. > > 1. please post your /proc/meminfo > 2. Do above copy make tons swap-out? IOW your disk read much faster than write? > 3. cache limitation of memcgroup solve this problem? > 4. Which disk have your /bin and /usr/bin? >
FWIW I fundamentally object to 3 as being a solution.
I still think the idea of read-ahead driven drop-behind is a good one, alas last time we brought that up people thought differently.
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