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Manually Setting IRQ's - SCO

I am having a problem with mirrored servers. The BIOS posts the NIC's at IRQ 7 and 15, however the hwconfig shows them at vec=16 and vec=17 which are low priority IRQ's. I need to know how I can manually assign these NIC's to IRQ's lower than 16. With the current setup the mirrors are taking 16-18 hours to regen. I have at least 2 identical setups except the NIC's are assigned to IRQ 12 and 15 and they regen in 2-6 hours....

  1. #1

    Default Manually Setting IRQ's

    I am having a problem with mirrored servers. The BIOS posts the NIC's
    at IRQ 7 and 15, however the hwconfig shows them at vec=16 and vec=17
    which are low priority IRQ's. I need to know how I can manually assign
    these NIC's to IRQ's lower than 16. With the current setup the mirrors
    are taking 16-18 hours to regen. I have at least 2 identical setups
    except the NIC's are assigned to IRQ 12 and 15 and they regen in 2-6
    hours.
    Alex Guest

  2. #2

    Default Re: Manually Setting IRQ's

    com wrote:
     

    According to my crystal ball, you're running SCO OpenServer release
    5.0.7, and the slow machine has SMP installed. These are only guesses,
    unfortunately.

    If that's it, you are wrong about IRQs 16 and 17 being "low priority".
    They are internal representations that the kernel's SMP interrupt
    routine uses to represent APIC pin number and PCI bus/device/function
    number information that doesn't really fit into the concept of an IRQ
    "number".

    Look elsewhere for the performance problem. Start by figuring out
    whether it's a CPU, memory or disk bottleneck.
     
    Bela Guest

  3. #3

    Default Re: Manually Setting IRQ's

    I still have so much to learn about Unix, but you are correct in
    everything you said. I am running 5.0.7 with SMP. Someone else helped
    me track down the bottleneck to the disks using sar -d. I wont post
    the entire results of that command here, but here's the final values.

    00:00:00 device %busy avque r+w/s blks/s avwait
    avserv (-d)
    Average fl-0 54.80 2.31 71.23 2059.01 10.08
    7.69
    Sdsk-0 31.84 1.00 3.99 43.02 0.05
    79.71
    Sdsk-1 100.00 1.00 79.95 2237.35 0.00
    28.76
    Stp-0 60.44 2.49 0.50 255.43 1804.37
    1211.31

    As you can see my Sdsk-1 is spiked at 100% busy, and that is without
    the regen running.

    adapter 0x9800-0x98ff 5 - type=ad160 ha=0 slot=0 bus=0 id=7
    fts=sto
    floppy 0x3f2-0x3f7 6 2 unit=0 type=135ds18
    udi - - - UDI environment
    adapter - - - ha=0 type=usb_msto UDI SCSI HBA
    adapter 0x1f0-0x1f7 14 - type=IDE ctlr=primary dvr=wd
    adapter - 7 - type=amird ha=0 id=7

    I know that I should provide more information about the raid
    controller if I'm going to ask for help here, unfortunately I just
    dont have that info available right at this moment. But at least I am
    on the right track now.
    Alex Guest

  4. #4

    Default Re: Manually Setting IRQ's


    "Alex" <com> wrote in message
    news:google.com... 

    AMI MegaRAID (or rebadged) controller. What type of system, a Dell (Perc
    [34]/[sd] ?) or HP (HP NetRAID [13]si/[12]m ?).

    The age of the machine and disks would help us give an idea.

    Also the memory that the machien has, and how much is set to buffers (echo
    v | crash | grep buf)..

    just some things to give us a hand.. ;)

    bkx


    Stuart Guest

  5. #5

    Default Re: Manually Setting IRQ's

    The controllers are LSI 64-bit Ultra 160's with the most up to date
    bios and firmware. The drives are 36GB hitachi's. The systems are
    built by Team1 Systems. Dual Xeon, 1GB of Ram. It's 2HDD's in a raid 1
    for the root drive, and 3HDD's in a Raid 5 for the data side. They are
    brand new machines (less than a month old).

    alarm1 # echo v | crash | grep buf
    v_buf: 250000
    v_hbuf: 262144
    v_mpbuf: 64
    v_mpheadbuf: 140

    Let me know of any other info that would be of help, I do have a few
    things that I am going to be trying today anyway. If any of them
    solves the problems I will post it here.

    Thanks Much!
    Alex
    Alex Guest

  6. #6

    Default Re: Manually Setting IRQ's

    com wrote:
     

    These numbers don't look sane. What sort of time period was this
    average collected over? The numbers say that the machine's floppy drive
    was busy 55% of the time, over whatever extended period you were looking
    at. That seems improbable. It also claims the floppy was pumping over
    2000 blocks/second, which is just plain impossible.
     
    Bela Guest

  7. #7

    Default Re: Manually Setting IRQ's

    Those numbers were over the period of a couple hours, the fl-0 is tied
    into my mirror regen program. So its not actually showing the numbers
    for the floppy but instead its the numbers for the regeneration of the
    mirror. This is something that is done on the install of that software
    which is called sentinel. Here's a full sar -d output.

    alarm1 # sar -d

    SCO_SV alarm1 3.2v5.0.7 Xeon 11/25/2003

    00:00:00 device %busy avque r+w/s blks/s avwait
    avserv (-
    01:00:01 fl-0 70.06 2.52 103.10 2977.93 10.35
    6.80
    Sdsk-0 28.57 1.00 1.32 3.79 0.00
    217.23
    Sdsk-1 100.00 1.03 106.28 2990.72 1.02
    36.08

    02:00:00 fl-0 68.81 2.30 97.36 2852.12 9.18
    7.07
    Sdsk-0 23.22 1.00 1.14 3.24 0.00
    203.14
    Sdsk-1 100.00 1.01 99.68 2860.56 0.45
    34.79

    03:00:02 fl-0 67.09 2.25 101.39 3018.51 8.24
    6.62
    Sdsk-0 28.77 1.00 2.00 7.70 0.00
    143.84
    Sdsk-1 100.00 1.01 200.34 5652.98 0.13
    13.24
    Stp-0 8.13 159.61 4.57 2340.16 2820.60
    17.78

    04:00:00 fl-0 25.18 3.54 30.21 747.40 21.18
    8.33
    Sdsk-0 45.38 1.00 1.60 4.68 0.00
    283.78
    Sdsk-1 100.00 1.01 40.92 944.67 0.48
    73.17

    05:00:00 fl-0 9.36 8.10 8.83 30.28 75.23
    10.60
    Sdsk-0 26.90 1.00 1.15 3.28 0.00
    233.72
    Sdsk-1 100.00 1.01 11.85 43.27 2.56
    231.50

    06:00:00 fl-0 11.65 7.08 10.85 37.51 65.29
    10.75
    Sdsk-0 38.92 1.00 1.23 3.48 0.00
    317.61
    Sdsk-1 100.00 1.02 14.63 53.48 5.78
    254.24

    07:00:00 fl-0 15.21 7.00 13.71 48.74 66.51
    11.09
    Sdsk-0 30.13 1.00 1.37 3.95 0.00
    220.67
    Sdsk-1 100.00 1.07 19.50 74.11 15.83
    233.84


    Average fl-0 38.19 3.14 52.19 1387.08 15.65
    7.32
    Sdsk-0 31.70 1.00 1.40 4.30 0.00
    226.42
    Sdsk-1 100.00 1.03 70.46 1802.75 1.26
    48.61
    Stp-0 1.16 159.61 0.65 334.61 2820.60
    17.78
    Alex Guest

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