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    SubjectRe: HZ=1024 for CPU >= 586?
    On Mon, Jan 18, 1999 at 03:42:33AM -0800, Christoph Lameter wrote:
    > On Mon, 18 Jan 1999, Erik Corry wrote:
    >
    > > In article <19990118083931.D10800@knt.terra.vein.hu> you wrote:
    > > > On Fri, Jan 15, 1999 at 11:01:09PM -0800, Christoph Lameter wrote:
    > > >> I recompiled 2.2.0pre7ac4 with HZ=1024 and the responsiveness of the
    > > >> Mousecursor under X is significantly improved. Lagging keyboard input etc
    > > >> etc have all been reduced.
    > >
    > > Sounds like a bug. It shouldn't make much difference.
    >
    > It should and does make a difference since timeslices with HZ=100 might be
    > relatively long.

    Yes, but above the refresh rate of your monitor, so how come you can
    see it?

    > > >> Could we have the kernel increase the HZ for the modern faster CPUs?
    > > >> F.e. leave it at 100 HZ for 386 486. Switch to 1024 for 586 and higher.
    > >
    > > Note that Linus has said that HZ is 100 to user processes
    > > now and forever, so anywhere where the user space can see
    > > what HZ is (some things in /proc, a few ioctls, etc.) it
    > > should stay at 100. Internally you can use higher values.
    >
    > For alpha cpus Linux already uses 1024. User processes like top see the
    > increase in HZ. And top shows wrong values...'

    Sorry, I meant on Intel. On Alpha presumably user-visible HZ is
    1024 now and forever. On Sparc it's a sysctl (needed anyway for
    Solaris compatibility).

    --
    Erik Corry erik@arbat.com Ceterum censeo, Microsoftem esse delendam!

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