Re: Latency data - 2.6.14-rc3-rt13
From: Lee Revell
Date: Wed Oct 12 2005 - 11:18:58 EST
On Wed, 2005-10-12 at 02:38 -0400, Steven Rostedt wrote:
> On Tue, 11 Oct 2005, Lee Revell wrote:
> > On Tue, 2005-10-11 at 18:09 -0700, Mark Knecht wrote:
> > > Should free memory drop like that over time?
> > Yes this is perfectly normal. When a system first boots all the memory
> > your apps aren't using is initially free. As applications access more
> > data over time then it will be cached in memory until free memory drops
> > to near zero.
> > "Free memory" is actually wasted memory - it's better to use all
> > available RAM for caching.
> But the swap being touched bothers me. Although I've had problems with
> leaving Mozilla up for long times and it leaking. Without Mozilla running
> and running lots of other apps, I have almost 100% memory used, but 0%
I believe this is the expected behavior under 2.6 unless you
set /proc/sys/vm/swappiness to 0. If an app allocates memory and then
never touches it then those pages will eventually be swapped out to make
room for hot ones.
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