Date: Sun, 4 Sep 2016 20:14:07 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Slawa Olhovchenkov <slw@zxy.spb.ru>, stable@FreeBSD.org Subject: Re: X2APIC support Message-ID: <358ed414-9da6-ac29-55fc-6d7be680c2ce@FreeBSD.org> In-Reply-To: <20160904162926.GF83214@kib.kiev.ua> References: <20151212130615.GE70867@zxy.spb.ru> <20151212133513.GL82577@kib.kiev.ua> <20160901112724.GX88122@zxy.spb.ru> <20160901114500.GJ83214@kib.kiev.ua> <20160901121300.GZ88122@zxy.spb.ru> <4ba05c00-f737-f562-553d-a7fa59145768@FreeBSD.org> <20160904151415.GE83214@kib.kiev.ua> <f727b18d-6061-fbaf-6afc-1ae66f8cce16@FreeBSD.org> <20160904162926.GF83214@kib.kiev.ua>
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On 04/09/2016 19:29, Konstantin Belousov wrote:
> This is possible, of course. But it would not affect "SMP: Added CPU ..."
> lines.
Well, looking at the code it seems that only if mptable is used, then those
lines are expected to correctly identify a BSP. With MADT there is no
information to identify the BSP and that is supposed to happen in cpu_mp_start().
static void
madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags)
{
struct lapic_info *la;
/*
* The MADT does not include a BSP flag, so we have to let the
* MP code figure out which CPU is the BSP on its own.
*/
...
In other words, those "SMP: Added CPU ..." are truly a cosmetic issue.
And it's my guess (just a guess) that BSP LAPIC ID is incorrect in the
problematic configuration.
--
Andriy Gapon
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