Hi
I'm building new samba server (on Debian 6.0, software RAID10 2TB, Xeon
CPU). Generally everything is working fine, so I have decided to run
some stress tests. My choice was dbench. Old server is Debian 4.0 (samba
3.0.24, Athlon 3000+, one ATA 160GB disk). So run
dbench 16
on both old and new server
The results are strange
old serwer: about 300MB/sek (dbench 3.0)
and below are first seconds of dbench output
> 16 1766 398.71 MB/sec warmup 1 sec
> 16 4852 334.46 MB/sec warmup 2 sec
> 16 7956 317.26 MB/sec warmup 3 sec
> 16 11117 309.62 MB/sec warmup 4 sec
> 16 14357 298.27 MB/sec warmup 5 sec
> 16 17579 295.52 MB/sec warmup 6 sec
> 16 20912 294.48 MB/sec warmup 7 sec
> 16 24167 292.58 MB/sec warmup 8 sec
......
new server: about 80MB/sek (dbench 4.0)
and below are first seconds of dbench output
> 16 859 347.35 MB/sec warmup 1 sec latency 420.932 ms
> 16 1535 203.14 MB/sec warmup 2 sec latency 625.747 ms
> 16 2905 175.82 MB/sec warmup 3 sec latency 466.965 ms
> 16 3705 147.27 MB/sec warmup 4 sec latency 511.865 ms
> 16 5111 142.35 MB/sec warmup 5 sec latency 543.783 ms
> 16 5961 130.80 MB/sec warmup 6 sec latency 830.662 ms
> 16 7413 130.37 MB/sec warmup 7 sec latency 875.614 ms
> 16 8235 122.21 MB/sec warmup 8 sec latency 450.523 ms
> 16 8448 110.87 MB/sec warmup 9 sec latency 743.648 ms
> 16 9725 110.55 MB/sec warmup 10 sec latency 841.132 ms
> 16 10901 110.39 MB/sec warmup 11 sec latency 291.013 ms
> 16 12014 109.05 MB/sec warmup 12 sec latency 537.937 ms
......
Please nore that on old server MB/sec are rather constant (about 300MB/s
) but on new one are dropping rapidly (at the end to about 80MB/s).
So what is going on? the new server is really fast (tested with iozone).
Regards
P.
