Swap with 16 Gb of RAM

Michael E Brown michael_e_brown at dell.com
Tue Aug 21 10:15:01 CDT 2001

If you are running Red Hat 7.1, then you have to make special
consideration for the swap rules that exist in this version of the OS.
Because of a "bug" in the VM subsystem in RH7.1, you need swap>=2xRAM.

Because of the limited HD expandability of the 8450, this may cause you
some problems, though :-). The recommendation is to either A) find a way
to get as close to swap=2xRAM as possible, possibly using swapfiles on
external drives, or B) run with no swap.


On Tue, 21 Aug 2001, Vsevolod Ilyushchenko wrote:

> Hi,
> I have a Dell 8450 with 16 Gb of RAM used for running biological
> computations. Currently I have 3.5 Gb of swap, and sometimes it is almost
> completely used up even when only 4 Gb of RAM is used. Worse of all,
> sometimes kswapd takes up a lot of CPU time. Here is a recent free output:
>              total       used       free     shared    buffers     cached
> Mem:      16490952   16486332       4620          0        420   12197416
> -/+ buffers/cache:    4288496   12202456
> Swap:      3578664    2915448     663216
> I am trying to understand what is going on, but I do not know much about
> swap usage or how to debug it. I do not even know about the proper
> newsgroup/mailing list to ask this question, except the linux-kernel list.
> (I am not sure whether I should go that far. :)
> Thanks in advance for any ideas,
> Simon

Michael Brown
Linux OS Development
Dell Computer Corp

  If each of us have one object, and we exchange them,
     then each of us still has one object.
  If each of us have one idea,   and we exchange them,
     then each of us now has two ideas.

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