Re: [OT] No Swap. Re: [BUG 2.6.90-test5] kernel shits itself with48mb ram under moderate load

[Mikulas Patocka]

> > Oh, it does matter. My workstation has 1 GB RAM and 2 GB swap and I hardly
> > see any problems with paging <g>.
> >
>
>    Because your workload doesn't hit the 1GB limit.
>    Actually we just do not have fast enough I/O + CPU to utilize 1GB of
> RAM efficiently.
>
>    But if you will go into 128MB of RAM - you will see difference, where
> should be no difference.
>
>    Let's say (my personal exp.) cp'ing of kernel source with 0.5/0.25 GB
> RAM dosn't differ. Aproximately the same time. 0.25GB little bit faster
> - but it can be written off to noise. But try to do the same cp with
> 0.125GB - this cp (as of RH 2.4.20-20.9 +ext3 -swap) takes _*two*_ times
> longer. Should it be?

Yes, it should. If you have 0.25GB, it can be copied into cache. If you
have 0.125GB, it doesn't fit there.

Mikulas
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