Messages in this thread | | | Date | Fri, 1 May 2015 14:42:39 -0700 | Subject | Re: [PATCH 0/1] speeding up cpu_up() | From | Len Brown <> |
| |
On Mon, Apr 20, 2015 at 12:15 AM, Ingo Molnar <mingo@kernel.org> wrote:
> So instead of playing games with an ancient delay, I'd suggest we > install the 10 msec INIT assertion wait as a platform quirk instead, > and activate it for all CPUs/systems that we think might need it, with > a sufficiently robust and future-proof quirk cutoff condition. > > New systems won't have the quirk active and thus won't have to have > this delay configurable either.
Okay, at this time, I think the quirk would apply to:
1. Intel family 5 (original pentium) -- some may actually need the quirk 2. Intel family F (pentium4) -- mostly b/c I don't want to bother finding/testing p4 3. All AMD (happy to narrow down, if somebody can speak for AMD)
I'd keep the cmdline override, in case we break something, or somebody wants to optimize/test. (Though I'll update units to usec, rather than msec., so we can go below 1ms without going to 0) I don't think we need the config option, just a #define to document the quirk.
What do you think?
Len Brown, Intel Open Source Technology Center
| |