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

[Ihar 'Philips' Filipau]

Mikulas Patocka wrote:
> > > 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.

  So you want to say to effectively copy (or whatever) 40GB harddrive I 
have to have 40GB of RAM? Ridiculous.
  Especially if copying is done in 4k lumps. (cp's default buffer)

<sarcasm flavour=sad> Hopefully not everyone shares your opinion. </sarcasm>

--
Ihar 'Philips' Filipau  / with best regards from Saarbruecken.
--
  "... and for $64000 question, could you get yourself vaguely
     familiar with the notion of on-topic posting?"
				-- Al Viro @ LKML

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