FW: [olug] Possible error message

[CM Miller]

Good info on swap space.  

thanks

-Chris 


--- Phil Brutsche <phil at brutsche.us> wrote:
> Trent Melcher wrote:
> > 
> > -----Original Message-----
> > From: Trent Melcher
> [mailto:tmelcher at trilogytel.com] 
> > Sent: Tuesday, May 06, 2003 8:26 PM
> > To: 'CM Miller'
> > Subject: RE: [olug] Possible error message
> > 
> > 
> > Yes, the gerenal rule of thumb is usually double
> the amount of RAM you
> > have for swap.
> 
> That's an old rule of thumb that really doesn't
> necessarily apply to 
> modern systems.  VM subsystems have improved quite a
> bit since the 1980s :)
> 
> Does a Linux firewall with 32 MB - one that's not
> running squid :) - 
> REALLY need ANY swap, much less 64MB?  NO
> 
> Does that database server with 2GB RAM REALLY need
> that 4GB swap?  Well, 
> maybe it does...
> 
> Does a workstation (ie MINE!) with 1GB+ RAM REALLY
> need 2GB+ swap?  NO
> 
> Does having swap help performance?  YES (at least,
> I've heard it does 
> under Linux, I've never run without swap to find
> out)
> 
> YMMV, of course.  It all depends on the situation,
> and most of the ones 
> I run into you do NOT *need* 2x RAM for swap.  99%
> of the time it's too 
> much for the application (ie it's wasted disk space
> because it's never 
> used), and the rest of the time it's way too little
> (mostly because the 
> machine's owner doesn't want to spend the $35 to get
> that extra Crucial 
> 256MB DDR266).
> 
> > I cant remember exactly, but there is a 4 GB
> limitation for 32bit
> > processors, it either on physical RAM or Virtual
> RAM, it may be both,
> > havent looked it up in a while.
> 
> Without PAE, 4GB physical; 36GB physical with PAE. 
> PAE is this feature 
> on PPro (maybe PII) and newer CPUs that changes
> memory addressing a 
> little bit (36-bit addresses instead of 32-bit).
> 
> 64GB total available address space.
> 
> That's with 32-bit ix86 processors, of course :)
> 
> -- 
> 
> Phil Brutsche
> phil at brutsche.us
> 
> 
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> OLUG at olug.org
> http://lists.olug.org/mailman/listinfo/olug


=====
"I come to seek in the land of the free, there is only room 
for the chose few."  

-Lars Frederickson and the Bastards, To Have And Have Not


GAIM ID:  cmmiller1973

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