promise sx4000 card & tx4000 results over 170mb/s sustained read

From: Trent George (soundsampler_at_sbcglobal.net)
Date: 07/18/03

  • Next message: Soeren Schmidt: "Re: promise sx4000 card & tx4000 results over 170mb/s sustained read" 
    Date: Thu, 17 Jul 2003 21:00:44 -0700 (PDT)
To: sos@freebsd.org

    Hi Soren,
     
    I wanted to congratulate you on fantastic results in performance on a tx4000 card.
     
    I have a dual amd mb with 66mhz support slot. 4 western digital drives (180gb each)
     
    I have clocked sustained 176mb/s read from this raid0 array and 120+mb/s write
     
    writes seemed cpu bound ? (50% idle from second processor)
    reads 56% idle (first process close to maxed out)
     
    there were several tricks to getting this performance, custom kernel compile
     
    1/ MAXPHYS=256k
    2/ MAXBSIZE=256k
    3/ atacontrol create RAID0 128 /dev/ad4 /dev/ad6 /dev/ad8 /dev/ad10
    4/ newfs -U bs=262144 /dev/ar0
     
    this allowed 64kb stripe size to use 4 drives on each "block" parallel reading
     
    i used iostat to monitor processor and transfer rate using following commands
     
    dd of=test.dat if=/dev/zero bs=64k count=20000
    dd if=test.dat of=/dev/null bs=64k
     
    Question #2
     
    I purchased a sx4000 card in the hope to increase speed :-)
    I noticed that PDC20621 is not in ata-chipset.c yet
    The card is not recognised on boot ether.
     
    Is there anything I can do or provide to help you add support for this card ?
     
    Question #3
     
    Is there any plans to support intel SATA raid support on ICH5R (i865/i875) for boot up (sort of like promise and highpoint)
     
    I have been experimenting with gigabit ethernet and sustained 100mb/s samba read/write performance, and seem to be making good progress.
     
    also experimenting on huge writeback cache (400mb+) up from 1mb vfs.hirunningspace
    seems to help with impressive burst network transfer speed.
     
     
    Thanks
     
    Trent George
     
     
    PS I don't know if you remember but I sent an amd system to you a long time ago to help add support for highpoint chipsets, I appreciate all your great work.
     
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  • Next message: Soeren Schmidt: "Re: promise sx4000 card & tx4000 results over 170mb/s sustained read"

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