On Tue, 19 Feb 2002, David Rees wrote:
> Wow, those numbers look great! Any idea why the PIII system seems to be a
> bit faster than the XP system, especially with random seeks? How much
Well, the 7850 card is faster than the 7810. And the PIII system has the
serverworks HE-sl chipset with a 64/66 PCI bus. The 3ware card is only 64/33,
but I think the serverworks still has a PCI bus advantage. I know that with
myranet cards, the serverworks chipset is the bandwidth king and even beats
the newer 760MPX.
> memory does each machine have? Do you happen to remember how many random
> seeks/s the SCSI system was able to sustain?
No idea about the random seeks. I don't know if the bonnie number for random
seeks means very much. Each machine has 1 GB of memory, PC133 in the
serverworks and PC2100 in the AMD760MP.
For addition comparison, here is software RAID0 on the athlon system, with two
maxtor 536DX drives (one model older than the other maxtor drives).
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
soft1 1500 14970 78.6 21986 15.2 15726 21.2 17268 84.9 56699 53.3 298.3 1.3
soft2 1500 19467 99.5 95167 95.5 28439 35.0 16199 84.1 59396 55.9 290.3 1.8
3ware 1500 20767 99.0 38409 16.9 17173 9.7 17810 84.5 71408 25.5 327.9 1.9
Soft1 is the performance after installing redhat with default settings. soft2
is after a series of tweeks of IDE driver parameters, kernel version, hdparm
settings, filesystem format, etc. Note that the 3ware number is for ext2
while soft2 if for ext3! I don't know if the main cause of the drastically
increased cpu usage is software raid, ext3 overhead, or a superior hardware
interface for the 3ware card.
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