lkml.org 
[lkml]   [2002]   [Jul]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: HZ, preferably as small as possible
    On Mon, Jul 15, 2002 at 03:52:37PM -0400, mbs wrote:
    > On Monday 15 July 2002 14:56, Linus Torvalds wrote:
    > > (*) Which is a lot less than the hw can generate, since you mustn't allow
    > > users to bog down the system in timer interrupts by just using
    > > "itimer(ITIMER_REAL, .. fine-resolution..)".
    >
    > actually, that is an interesting philosophical argument.
    >
    > in an embedded system, it is sometimes more useful to not put artificial

    That's why we have RTLinux.

    > in an embedded system a "tickless" system is sometimes preferable to a ticked
    > system. there is often only one or a very small number of processes/threads
    > running and the extra overhead of 10 surplus clock ticks per process quantum
    > is a waste of cycles. (also when using a ppc or similar modern chip(flame
    > on;-), there is no need to keep a software wall clock, as the cpu has a 64bit
    > free running counter)

    Right: but "one or a very small number of processes/threads" does not apply to
    Linux.



    --
    ---------------------------------------------------------
    Victor Yodaiken
    Finite State Machine Labs: The RTLinux Company.
    www.fsmlabs.com www.rtlinux.com

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:27    [W:0.057 / U:60.104 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site