From 44c33fda3614d588e6bf6cee1cf884e98f1531f0 Mon Sep 17 00:00:00 2001 From: Haru Date: Fri, 11 Oct 2013 05:07:45 +0200 Subject: Changed 'tick' variables to 64 bit - This fixes an issue with timers that stop working after about 24-49 days when the tick overflows (note that this may happen much earlier than that, and at hard to predict times, on some systems) - Updated the RDTSC help message in the configure script to also warn users about issues with SpeedStep enabled systems. - On Windows, tick() still has a resolution of 10~15ms (or even as low as 100ms on some systems). A TODO comment (thanks, Ai4rei) was added for a follow-up patch, as I want this one to be as small as possible) - Note: on Windows versions earlier than 6.x (Vista, Server 2008), the tick overflow issue is NOT fixed, since they don't support the function used to retrieve a 64 bit tick. This isn't a big issue, since those platforms are already - or going soon to be - out of their extended support period, and it's already advisable to upgrade, for other reasons. If you're the unfortunate user of such a system, it is recommended that you reboot your machine at least once every 49 days for Hercules to work reliably. - Note: To clear some doubts, since I've already been asked, this has absolutely NOTHING to do with 32/64 bit CPUs or OSes. It's all about a variable's size, not the size of registers of your CPU, and your 32bit CPU will be able to handle this just fine. Signed-off-by: Haru --- configure | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'configure') diff --git a/configure b/configure index abba75ea1..919d6f883 100755 --- a/configure +++ b/configure @@ -1,5 +1,5 @@ #! /bin/sh -# From configure.in d26927e. +# From configure.in c4af60e. # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.69. # @@ -1333,9 +1333,15 @@ Optional Features: in conjunction with XEN or Other Virtualization mechanisms) Note: Please ensure that you've disabled dynamic CPU-Frequencys, such as power saving - options. (On the most modern Dedicated Servers - cpufreq is preconfigured, see your distribution's - manual how to disable it) + options. (On most modern Dedicated Servers cpufreq + is preconfigured, see your distribution's manual how + to disable it). Furthermore, If your CPU has + built-in CPU-Frequency scaling features (such as + Intel's SpeedStep(R)), do not enable this option. + Recent CPUs (Intel Core or newer) guarantee a fixed + increment rate for their TSC, so it should be safe + to use, but please doublecheck the documentation of + both your CPU and OS before enabling this option. --enable-profiler=ARG Profilers: no, gprof (disabled by default) --disable-64bit Enforce 32bit output on x86_64 systems. --enable-lto Enables or Disables Linktime Code Optimization (LTO -- cgit v1.2.3-70-g09d2