• Alok Kataria's avatar
    x86: use cpu_khz for loops_per_jiffy calculation · 3da757da
    Alok Kataria authored
    On the x86 platform we can use the value of tsc_khz computed during tsc
    calibration to calculate the loops_per_jiffy value. Its very important
    to keep the error in lpj values to minimum as any error in that may
    result in kernel panic in check_timer. In virtualization environment, On
    a highly overloaded host the guest delay calibration may sometimes
    result in errors beyond the ~50% that timer_irq_works can handle,
    resulting in the guest panicking.
    Does some formating changes to lpj_setup code to now have a single
    printk to print the bogomips value.
    We do this only for the boot processor because the AP's can have
    different base frequencies or the BIOS might boot a AP at a different
    Signed-off-by: default avatarAlok N Kataria <akataria@vmware.com>
    Cc: Arjan van de Ven <arjan@infradead.org>
    Cc: Daniel Hecht <dhecht@vmware.com>
    Cc: Tim Mann <mann@vmware.com>
    Cc: Zach Amsden <zach@vmware.com>
    Cc: Sahil Rihan <srihan@vmware.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
calibrate.c 4.94 KB