want to see something pretty damn impressive??
real freebsd box, pentium 4 1.8GHz, 1.5GB ram, single 120G disk on a standard IDE channel. here is its 'diskinfo -ctv':
pollux# diskinfo -ctv /dev/ad1
/dev/ad1
512 # sectorsize
120034123776 # mediasize in bytes (112G)
234441648 # mediasize in sectors
232581 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
I/O command overhead:
time to read 10MB block 0.182131 sec = 0.009 msec/sector
time to read 20480 sectors 1.934665 sec = 0.094 msec/sector
calculated command overhead = 0.086 msec/sector
Seek times:
Full stroke: 250 iter in 5.622271 sec = 22.489 msec
Half stroke: 250 iter in 4.339111 sec = 17.356 msec
Quarter stroke: 500 iter in 6.959858 sec = 13.920 msec
Short forward: 400 iter in 2.147981 sec = 5.370 msec
Short backward: 400 iter in 1.184482 sec = 2.961 msec
Seq outer: 2048 iter in 0.213627 sec = 0.104 msec
Seq inner: 2048 iter in 0.217149 sec = 0.106 msec
Transfer rates:
outside: 102400 kbytes in 1.791294 sec = 57165 kbytes/sec
middle: 102400 kbytes in 2.167648 sec = 47240 kbytes/sec
inside: 102400 kbytes in 3.465312 sec = 29550 kbytes/sec
here is a vmware guest, also FreeBSD, on a Linux Host (dual xeon 2.66) with a SATA RAID0 partition:
regor# diskinfo -cvt /dev/da0
/dev/da0
512 # sectorsize
9663676416 # mediasize in bytes (9.0G)
18874368 # mediasize in sectors
1174 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
I/O command overhead:
time to read 10MB block 0.208058 sec = 0.010 msec/sector
time to read 20480 sectors 4.980273 sec = 0.243 msec/sector
calculated command overhead = 0.233 msec/sector
Seek times:
Full stroke: 250 iter in 4.704609 sec = 18.818 msec
Half stroke: 250 iter in 4.178791 sec = 16.715 msec
Quarter stroke: 500 iter in 5.587117 sec = 11.174 msec
Short forward: 400 iter in 0.596792 sec = 1.492 msec
Short backward: 400 iter in 1.815755 sec = 4.539 msec
Seq outer: 2048 iter in 0.556478 sec = 0.272 msec
Seq inner: 2048 iter in 0.587404 sec = 0.287 msec
Transfer rates:
outside: 102400 kbytes in 1.649082 sec = 62095 kbytes/sec
middle: 102400 kbytes in 1.691255 sec = 60547 kbytes/sec
inside: 102400 kbytes in 1.899930 sec = 53897 kbytes/sec
now i realize, that the xeon box, is just plain faster. were talking xeons vs p4, and SATA vs IDE. but i never... NEVER would have guess that a guest machine could still outperform the real thing.
is there a bowdown smilie?
i had the WORST i/o experienced witih MS VS2005, and i punished myself with that product for over a year. i WISH i had moved to vmware-server while it was still in beta. kudos to the vmware team for a truly superior product!!