Re: Ultra ATA card doesn't seem to provide Ultra speeds.

From: Buckie (freebsd1_at_centrum.cz)
Date: 07/31/03

  • Next message: Bruce M Simpson: "Re: vmstat counter "bug"" 
    Date: Thu, 31 Jul 2003 21:26:47 +0400
To: freebsd-hackers@freebsd.org

    Wow. But still, can it be that something bottlenecks somewhere so that
    I can't get these loverly speeds? Can I measure pci performance as
    well? Would be cool to understand what doesn't allow this system to
    use the 133 to its max...

    Z

    >> > Guess I just didn't look hard enough or in the right place. I only spent a
    >> > minute or 2 on it, but yeah ATA drives don't tell you that sort of thing,
    >> > they say stuff like "ATA133 for a max transfer rate of 133 MB/sec *" then
    >> > at the bottom the * says something like "133 MB/sec burst rate from drive
    >> > to controller" or something similar. But I did try fairly hard to find
    >> > specs on our Seagate drives and couldn't find a hard number that told what
    >> > the maximum read and write speeds were.
    >>
    >> Thats maybe true for some drives, but generally they state this info
    >> in their docs, for the Diamond 9+ it took me < 10 secs to find the
    >> below transfer speeds, I did have the PDF handy though :)
    >>
    >> Disk to Read Once a 236Mb/sec 236Mb/sec 236Mb/sec 236Mb/sec
    >> Revolution mminimum minimum minimum minimum
    >>
    >> 433Mb/sec 433Mb/sec 433Mb/sec 433Mb/sec
    >> maximum maximum maximum maximum
    >>
    >> Disk to Read 257Mb/sec 257Mb/sec 257Mb/sec 257Mb/sec
    >> Instantaneously minimum minimum minimum minimum
    >>
    >> 472Mb/sec 472Mb/sec 472Mb/sec 472Mb/sec
    >> maximum maximum maximum maximum
    >>
    KC> OK you win :-P I just don't know where to look I guess.

    KC> Ken
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  • Next message: Bruce M Simpson: "Re: vmstat counter "bug""