RE: swp - Re: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard)

HAY!  DON'T CALL ME GRANDPA!!!!  Not for a few more years at least!

:)

And I was there!  And beyond!  My first home computer had a 4K card and an
8K card, if I recall.  It was 6800 based.  I wonder if I still have it?  I
did use punch cards in college!  Some computers had core memory, but no tube
based computers.  I am not that old!!!

In the days of my 486-33, I paid $400 for 16Meg of RAM.  The price doubled
just after that when the only epoxy plant burned down or something.  Now my
video card has 64Meg of RAM!  My first hard disk to break the $1 per meg
boundary was a Maxtor 340Meg, cost me about $320.  Now we are under the $1
per Gig boundary.  Today, disk drives are so cheap you get 1 in a happy
meal. :)  Today, I guess disk space is 50-100 times cheaper per gig than
RAM.

Ouch!  At the prices listed above, 1 gig of RAM would cost $25,000, and a
250Gig disk would cost $235,294.  The price of RAM has dropped by 250 times.
The price of disk drives dropped by over 1000 times.  The future is going to
be so cool!

You said memory was 10x the cost of disks.  In the example above, memory is
25x more than disk.  Today it is about 100x.  Maybe we should be swapping
even more, now?  :)

Guy

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Alvin Oga
Sent: Thursday, January 06, 2005 12:04 AM
To: Mike Hardy
Cc: linux-raid@vger.kernel.org
Subject: Re: swp - Re: ext3 journal on software raid (was Re: PROBLEM:
Kernel 2.6.10 crashing repeatedly and hard)



On Wed, 5 Jan 2005, Mike Hardy wrote:

There are those that think if they size the machine correctly, they 
shouldn't need swap, and they're right.

bingo
 

quoted

I had 8 Meg of swap space.  So 12 meg total available virtual memory.
One day I added 16 Meg of RAM.  So now I had 20 Meg of RAM.  I deleted

my

quoted

swap space.  Everyone told me I needed 20-40 Meg of swap space now!

Swap

quoted

space should be 2 time RAM size.  How crazy, my memory requirements did

not

quoted

change, just the amount of memory.  I used that system for a year or so

like

quoted

that.  Go figure!

the silly rule of 2x size of RAM == swap space came from the old days
when memory was 10x the costs of disks or some silly cost performance
that it made sense when grandpa was floating around

by todays ram and disk pricing ... and cpu speeds ...2x memory sorta
goes out the door

c ya
alvin

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