DragonFly commits List (threaded) for 2010-03
Re: git: kernel - vm - Change inactive target to 1/4 memory instead of 1/2 memory.
Matthew Dillon <email@example.com> wrote:
> :On my troublesome 2GB machine, the inactive memory is now ~= 750M, which
> :is about 1/3 of RAM, quite far from the 1/4 target.
> :Francois Tigeot
> It's just a target for the pageout daemon, it isn't something the
> machine tries to hold itself to.
> Guys... everyone. Please don't try to interpret the values for
> the active & inactive queues. Even a good chunk of the analysis of
> the swap space use is wrong. There's absolutely nothing wrong with
> the machine paging stuff out to swap. The issue is only whether it
> does so to the degree that later pageins effect performance.
> Avalon, for example, usually has 200-400MB of idle data swapped out
> which it basically never touches. It doesn't effect avalon's
One point is probabely whether swap is on a disk with otherwise high
IO rate. On my single disk system it is clearly a performance problem
if program data is paged out due to filesystem activity because then
the paging in is very slow.
I can trigger this situation with
but also with
find / -type f | xargs md5
Maybe on avalon the swap space is on a separate disk in which
case paging back in is faster?