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    SubjectRe: 2.6.0 "Losing too many ticks!"
    On Thu, 2003-12-25 at 13:14, Giacomo Di Ciocco wrote:
    > Joe Korty wrote:
    > > Or maybe IDE DMA is disabled. That would account for lost
    > > ticks during period of heavy disk IO. Giacomo, type
    > >
    > > hdparm /dev/hda
    > >
    > > If it shows 'using DMA' off, try
    > >
    > > hdparm -d1 /dev/hda
    > >
    > > If that fails then the IDE driver you need is not
    > > configured in your kernel.
    > >
    > > Joe
    > Hi Joe,
    > enabling the dma mode has resolved the "Losing too many ticks" thing, now the
    > system seems running fine,

    OK. So DMA must be on when HZ is 1000. Let's have
    the kernel refuse to load the IDE driver w/o DMA
    if HZ is over 100. Ha, ha, only serious... :-(

    > the unique strange thing is the "Unknown HZ value!
    > (92) Assume 100." message, that appears before the output of any program launched.

    Your clock is screwed. Reboot, or upgrade procps
    to a version that can compensate. Version 3.1.15
    from is best.

    Here's the release notes:

    [ANNOUNCE] procps 3.1.15

    This release supports the NSA's high-security SELinux
    on the 2.6.0 kernel, without any additional libraries
    required. Thread support no longer sets off chkrootkit
    on buggy 2.4.xx kernels. (the PID 0 problem) Now "top"
    works on terminals with auto-margin problems.

    For those of you still upgrading from procps 2.0.xx releases,
    you can expect:

    * ps fully supports thread display (H, -L, m, -m, and -T)
    * ps can display NSA SELinux security contexts
    * top can show CPU usage for IO-wait, IRQ, and softirq
    * can set $PS_FORMAT to choose your own default ps format
    * better width control ("ps -o pid,wchan:42,args")
    * width of ps PID column adjusts to your system
    * vmstat lets you choose units you like: 1000, 1024, 1000000...
    * top can sort by any column (old sort keys available too)
    * top can select a single user to display
    * top can be put in multi-window mode and/or color mode
    * vmstat has the -s option, as found on UNIX and BSD systems
    * vmstat has the -f option, as found on UNIX and BSD systems
    * watch doesn't eat the first blank line by mistake
    * vmstat uses a fast O(1) algorithm on 2.5.xx kernels
    * pmap command is SunOS-compatible
    * vmstat shows IO-wait time
    * pgrep and pkill can find the oldest matching process
    * sysctl handles the Linux 2.5.xx VLAN interfaces
    * ps has a new "-F" format (very nice, like DYNIX/ptx has)
    * ps with proper BSD process selection
    * better handling of very long uptimes

    There's a mailing list you can
    use for feature requests, bug reports, and so on. Use it!
    Feedback makes things happen.

    ------------- recent changes -------------

    procps-3.1.14 --> procps-3.1.15

    hide kernel PID bug (Linux 2.4.13-pre1 to 2.4.MAX) #217278 #219730 #217525 #224470
    ps: faster threaded display
    top: auto-margin problem #217559
    ps: support NSA SELinux, all builds, Linux 2.6+ #193648
    sysctl: tweak man page for ESR's broken parser

    procps-3.1.13 --> procps-3.1.14

    top: displays on more genuine serial terminals
    handle 32-bit dev_t of Linux 2.6
    ps: finally, m and -m satisfy the original design
    ps: distinct per-thread and whole-process pending signals

    procps-3.1.12 --> procps-3.1.13

    ps: can display NPTL threads w/ kernel patch
    no seLinux for now (new kernel interface)

    procps-3.1.11 --> procps-3.1.12

    ps: explicit width ("ps -o pid,wchan:42,args")
    ps: $PS_FORMAT works properly #201575
    top: new Linux 2.6.0-test4 CPU stats shown
    top: multiple -p options work again
    top: fixed 4 GB wrap-around
    ps: has a set of tests to ensure correctness
    man page: /var/run/utmp, not /etc/utmp #206583
    required flags moved out of CFLAGS #205429
    RPM generation handles /lib64
    WCHAN skips leading '.'
    vmstat: numerous new features

    procps-3.1.10 --> procps-3.1.11

    compile with gcc 2.95 again (C99 issue)

    procps-3.1.9 --> procps-3.1.10

    handle GPLONLY_ symbols #143549 #188374
    kill: better man page
    skill: better man page
    ps: PID-like columns change width as needed
    top: COMMAND instead of Command
    vmstat: -m displays slabinfo
    vmstat: -d displays disk stats


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