Updating Development Version on Slow machines from another Fast machine

[Siju George <sgeorge.ml@xxxxxxxxx>]

Hi,

I have a Backup Server on another Floor.
It runs on Qemu with the OS on a qcow2 Virtual Disk ( file ) and
Backup Data on Two Physical Disks.
It mirrors from Master PFSes  on backup server on another floor. Also
It's own master PFSes are backed up by the slaves on the other one.

===============================================
load averages:  0.90,  0.56,  0.25;               up 0+00:14:46        06:17:01
28 processes: 2 running, 28 active
CPU states: 62.1% user,  0.0% nice, 36.1% system,  0.5% interrupt,  1.4% idle
Memory: 36M Active, 938M Inact, 182M Wired, 94M Buf, 1843M Free
Swap: 1734M Total, 1734M Free
===============================================

Make Build takes a very long time on it Some times more than 8 hours.
Possibly due to the Poor perfaomance on the UnderLying REAL Hardware.

In order to update it is it enough that I rsync /usr/src  and
/usr/obj/usr/src from the faster server after building 'world' and
'kernel' and then run only

# make installkernel KERNCONF=GENERIC && make installworld && make
upgrade && reboot

If not what it the best way to update a slower machine?

Thanks

--Siju