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Annotation of embedaddon/ntp/html/hints/solaris.xtra.4095849, revision 1.1

1.1     ! misho       1:  Bug Id: 4095849
        !             2:  Category: kernel
        !             3:  Subcategory: syscall
        !             4:  State: evaluated
        !             5:  Synopsis: time_constant value >6 with PLL in use leads to integer divide
        !             6:            zero trap panic
        !             7:  Description:
        !             8: If the time_constant parameter is 7 or higher, and the phase-lock looping model
        !             9: is in use, the system will take a "integer divide zero trap" panic in
        !            10: the clock routine as soon as the time_offset becomes non-zero.
        !            11: 
        !            12: time_constant defaults to 0.  The only place it is set is in the ntp_adjtime
        !            13: system call, from the 'constant' element of the timex structure argument.
        !            14: 
        !            15:  Work around:
        !            16: Never set the constant element of the timex structure passed to ntp_adjtime to
        !            17: a value larger than 6.
        !            18: 
        !            19: satish.mynam@Eng 1998-04-30
        !            20: 1. Use Sun's version of NTP software instead of PD version. This problem
        !            21: is not seen with Sun's NTP version (which is mostly eqivalent to PD NTP 3.4
        !            22: plus some Sun's local functionality futures).
        !            23: 
        !            24: 2. Workaround for the public domain NTP version  ONLY:
        !            25:  =====================================================
        !            26: The workaround for public domain NTP version is to disable the
        !            27: KERNEL_PLL from the NTP code. This way ntp_Adjtime() system call is
        !            28: totally bypassed without sacrificing any of the functionality of the
        !            29: NTP. The only hit you might see is the way  kernel precision timminig
        !            30: is done without the PLL algorithm in the kernel.
        !            31: 
        !            32:     The easiest way to disable ntp_adjtime option is(without changing
        !            33:     any makefiles or other config files) to disable the KERNEL_PLL
        !            34:     value in the ./config.h file.
        !            35: 
        !            36: After doing a ./configure for probing for all the necessary tools(compilers,
        !            37: os version, libraries),  please comment out KERNEL_PLL macro in
        !            38: the ./config.h  file.  This will disable the KERNEL_PLL part of the source
        !            39: code and the newly obtained xntpd is just similar to the old one but it
        !            40: does not use ntp_adjtime() system call. This prevents it from panic'ng
        !            41: the kernel.
        !            42: 
        !            43: /*#define KERNEL_PLL 1*/
        !            44: 
        !            45: I complied a new xntpd binary this way and it does nothave any ntp_adjtime()
        !            46: related stuff.
        !            47: 
        !            48: Default:
        !            49: =======
        !            50: /net/divya/export/home/mynam/public_domain/ntp/xntp3-5.92/xntpd>strings
        !            51: xntpd |
        !            52: grep ntp_adjtime
        !            53: 354:adj_frequency: ntp_adjtime failed: %m
        !            54: 357:loop_config: ntp_adjtime() failed: %m
        !            55: 435:get_kernel_info: ntp_adjtime() failed: %m
        !            56: 
        !            57: With KERNEL_PLL disabled in config.h file
        !            58: -=======================
        !            59: 
        !            60: /net/divya/export/home/mynam/public_domain/ntp/xntp3-5.92/xntpd>strings
        !            61: xntpd.nopll | grep ntp_adjtime
        !            62: 
        !            63:         Integrated in releases:
        !            64:  Duplicate of:
        !            65:  Patch id:
        !            66:  See also: 4133517
        !            67:  Summary:
        !            68: If the time_constant parameter is 7 or higher, and the phase-lock looping model
        !            69: is in use, the system will take a "integer divide zero trap" panic in
        !            70: the clock routine as soon as the time_offset becomes non-zero.
        !            71: 
        !            72: time_constant defaults to 0.  The only place it is set is in the ntp_adjtime
        !            73: system call, from the 'constant' element of the timex structure argument.
        !            74: ----------------------------------------------------------------------------