lkml.org 
[lkml]   [2009]   [Mar]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] x86: don't compile vsmp_64 for 32bit
Ravikiran G Thirumalai wrote:
> The point in this thread was, is_vsmp_box() needs to be meaningful even when
> CONFIG_X86_VSMP is not on. This is needed because is_vsmp_box() is used to
> determine if the platform has reliable tscs.
>

Well, as I said, that code is inoperative at present. But aside from
that, how well will a non-VSMP kernel work on your hardware, with a
normal cacheline, etc. Is the tsc stability really all that important,
given that the kernel should notice if the tsc is busted pretty quickly
anyway.

unsynchronized_tsc() just returns a guess anyway, and if you don't have
X86_FEATURE_CONSTANT_TSC set, then it will return unstable for your
hardware anyway, even without the is_vsmp_box() test.

Failing that, you could add yourself to bad_tsc_dmi_table[] and have
that mark the tsc as unstable (you have DMI, right?).

J




\
 
 \ /
  Last update: 2009-03-26 01:01    [W:0.068 / U:6.808 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site