[Gllug] Constrained virtual machines

[Andy Smith]

On Fri, Dec 01, 2006 at 09:08:49AM +0000, Richard Jones wrote:
> On Thu, Nov 30, 2006 at 03:05:11PM +0000, Richard Huxton wrote:
> > Is anyone using VM technology that provides limits on CPU and I/O as 
> > well as memory usage?
> 
> Be aware that disk performance under any VM I've seen sucks compared
> to the real hardware ... 

$ bonnie++ -d /var/tmp/bonnie -s 1g -n 0 -m domU -r 256
Writing with putc()...done
Writing intelligently...done
Rewriting...done
Reading with getc()...done
Reading intelligently...done
start 'em...done...done...done...
Version  1.03       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
domU             1G 24880  93 53964  10 24532   1 20495  58 76990   1 197.4   0
domU,1G,24880,93,53964,10,24532,1,20495,58,76990,1,197.4,0,,,,,,,,,,,,,

$ bonnie++ -d /var/tmp/bonnie -s 1g -n 0 -m dom0 -r 256
Writing with putc()...done
Writing intelligently...done
Rewriting...done
Reading with getc()...done
Reading intelligently...done
start 'em...done...done...done...
Version  1.03       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
dom0             1G 25151  94 55310  19 29343   2 24158  62 102648   0 185.2   0
dom0,1G,25151,94,55310,19,29343,2,24158,62,102648,0,185.2,0,,,,,,,,,,,,,

Seems neither sucky nor vastly different to me, considering that is
ext3 on LVM on RAID10 on 4 7.2kRPM SATA drives.

Cheers,
Andy
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