i386/104678: SMP not working on Turion XP Laptop

[Andrew Pantyukhin]

The following reply was made to PR i386/104678; it has been noted by GNATS.

From: "Andrew Pantyukhin" <infofarmer at FreeBSD.org>
To: "Bruce Evans" <bde at zeta.org.au>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: i386/104678: SMP not working on Turion XP Laptop
Date: Tue, 7 Nov 2006 11:29:25 +0300

 On 11/7/06, Bruce Evans <bde at zeta.org.au> wrote:
 > On Mon, 6 Nov 2006, Andrew Pantyukhin wrote:
 >
 > > I experience the same on a Turion X2 laptop
 > > with FreeBSD 7/amd64,
 >
 > On a similar laptop (HP nx6325 Turion X2 2GHz), I found 2 workarounds:
 
 I have Fujitsu-Siemens Amilo Pa 1510 Turion X2 TL-56 1.8GHz
 
 > 1. Boot with battery power only.  Usually works.
 >
 > 2. After forgetting (1), toggle AC power off and on.  Leave it off a
 >     few seconds.  Usually works after 1 iteration.
 
 These workarounds don't work for me. What does work though
 is keeping CPU loaded (at least one core) with something like
 "md5</dev/zero" in the background. Some timings are still of,
 especially with TSC timecounter, but with i8254 and ACPI-fast
 it's mostly all right.
 
 Just constantly moving mouse (touchpad) in X also helps.
 
 > Some symptoms:
 
 Very same symptoms. Word for word (but I didn't run ddb).
 
 My dmesg and sysctl from 6.x and 7.x are at:
 http://people.freebsd.org/~sat/abc/dj/
 
 This laptop basically has ATI RS 485MC chipset +
 SB460 south bridge.
 
 What may be of intereset is that VMware guest hosts
 have rather similar issues until you disable apic.