Value of memory

Blake Hudson blake at
Thu Aug 7 14:18:13 UTC 2014

Robert, I'm running a minimal install of CentOS7 on x86 hardware. This 
system provides authoritative and recursive roles across two separate 
BIND views. I also have rbldnsd serving a few zones on this system.

free reports the following after ~24 hrs of uptime:
              total       used       free     shared    buffers cached
Mem:      10071492     912808    9158684      16880        764 319180
-/+ buffers/cache:     592864    9478628
Swap:      5185532          0    5185532

I, too, find that my CentOS 6 systems are using ~ 2GB of RAM. Memory 
usage on C7 appears to be down compared to a similarly configured C6 
name server. Hope this provides a reference point.


Robert Moskowitz wrote the following on 8/6/2014 10:39 PM:
> I have a server that is only running bind 9.8.2 (Centos 6.5).  It has 
> 2Gb memory and free reports ~1.7Gb used.
> I am looking at replacing this server with an armv7 board running 
> Redsleeve (until Centos 7 is out and stable for armv7).  I have a 
> choice of boards, one with 1Gb memory ($60) and one with 2Gb memory 
> ($90).
> This server servers out my zones and supports the couple handfull of 
> systems on my net.  I would like to eventually get to DNSSEC, but that 
> is another stalled project.
> About the only meaningful difference between the two boards (btw, 
> Cubieboard2 and Cubietruck) for my needs is the memory.  I know more 
> memory is better, but how much better?
> Oh, why the move to arm?  Power consumption.  ROI for the C2 board is 
> one year just on power saving.
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