Re: [OT] No Swap. Re: [BUG 2.6.90-test5] kernel shits itself with 48mb ram under moderate load

["Ihar 'Philips' Filipau" <filia@softhome.net>]

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