simple performance tests

[Thomas Mueller <thomas@chaschperli.ch>]

hi

i've done some performance tests on a small system.

HW:
* Supermicro X7SPA-HF (with IMPI and KVMoverIP integrated))
* Atom D510 1.6GHz DualCore and HT
* WD RE3 500GB 7200umin disks
* 4GB RAM

SW:
* Debian 5.0 "Lenny"
* Kernel 2.6.32 (backports.org)
* ceph/unstable
* ceph-client-standalone/unstable-backport

values are MB/s. all tests are local.

dbench 1 results:
* 1 disk, btrfs: 115
* 2 disks, btrfs data/metadata raid0: 115
* 1 osd/disk, 1 mds, 1 mon: 7
* 2 osd/disk, 1 mds, 1mon: 6.2117
* 1 disk, btrfs, samba: 14.02
* 2 disks, btrfs data/metadata raid0, samba: 13.781

dbench 10 results:
* 1 disk, btrfs: 271.724
* 2 disks, btrfs data/metadata raid0: 270.043
* 1 osd/disk, 1 mds, 1 mon: -
* 2 osd/disk, 1 mds, 1mon: 12.1862
* 1 disk, btrfs, samba: 20.22
* 2 disks, btfs data/metadata raid0, samba: 20.26

dd bs=1M count=8192 if=/dev/zero
* 1 disk, btrfs: 126
* 2 disks, btrfs data/metadata raid0:  271
* 1 osd/disk, 1 mds, 1 mon: -
* 2 osd/disk, 1 mds, 1mon: 51.2
* 1 disk, btrfs, samba: 95.2
* 2 disks, btrfs data/metadata raid0, samba: 85.9

will add a AOC-USAS-H8iR (LSI) RAID card to the mix if  i get the cables 
needed.

i'm a bit suprised about the low rates of ceph. i'll try to to the same 
tests on a more powerfull machine. 

- Thomas