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On Tue, 2 May 2006 00:21:08 -0400 Charles Shannon Hendrix wrote: > Tue, 11 Apr 2006 @ 01:33 -0700, Linda Walsh said: > > > Hmmm, not to be contrary, but I have a 1GB system that refuses to swap > > during large file i/o operations. For the first time in a *long* time, > > I read someone's suggestion to increase swappiness -- I did, to 75 or 80, > > (I've booted since then, so it's back to 60 and no swap usage) and some of > > the programs that rarely run actually swapped. It was great! I finally had > > more memory for file i/o operations. > > It's great if you actually need the file data that gets stored. > > > Maybe you are telling the system to "feel free" to use swap by having a > > large swap file? > > I don't believe that matters, and certainly doesn't seem to affect my > own system. > > If I use a smaller swap file, I just run out faster. > > Is your experience different? > > > I agree. Try getting rid of your swap file entirely -- your system > > will still run unless you are overloading memory, but you have a Gig. > > How much do you need to keep in memory? Sure, if/when I get a 4-way > > CPU (I have a 2-cpu setup now), I might go up to 4G, but I might be > > running multiple virtual machines too! > > Sure it will run, but I *want* swap to be used to remove unused > programs. > > My current problem is that *useful* program code is being swapped out and > being replaced by *useless* cached file data. > > > You might try the "cfq" block i/o algorithm. Then you can > > ionice down the disk priority of background processes (though you need > > to be root to reduce ionice levels at this point, unlike cpu nice). > > I've not seen ionice. It's hidden^w embedded in Documentation/block/ioprio.txt ... --- ~Randy - 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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