Date: Mon, 03 Nov 2003 11:28:29 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Andy Farkas <andyf@speednet.com.au> Cc: cvs-all@freebsd.org Subject: RE: cvs commit: src/sys/i386/i386 machdep.c Message-ID: <XFMail.20031103112829.jhb@FreeBSD.org> In-Reply-To: <20031101124953.I85774@hewey.af.speednet.com.au>
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On 01-Nov-2003 Andy Farkas wrote: > John Baldwin wrote: >> On 31-Oct-2003 Bruce Evans wrote: >> > On Fri, 31 Oct 2003, John Baldwin wrote: >> > >> >> >> >> On 31-Oct-2003 John Baldwin wrote: >> >> > jhb 2003/10/31 06:24:29 PST >> >> > >> >> > FreeBSD src repository >> >> > >> >> > Modified files: >> >> > sys/i386/i386 machdep.c >> >> > Log: >> >> > - Finish externing of r_idt in the f00f hack code. >> >> > - Miscellaneous style fixes in the f00f hack code and some nearby code. >> >> > >> >> > Submitted by: bde >> > >> > Thanks. >> > >> >> This might actually fix SMP on Pentium's since the AP's will not >> >> point to the correct IDT without this fix. >> > >> > Have the been any reports of it being broken? We configure the f00f hack >> > code on all PentiumIs (aka P5s) including ones without the f00f bug, so >> > the r_idt bug probably breaks all SMP systems with such CPUs. >> >> Actually, since this still used the global r_idt in the SMP case, I'm >> not sure it was really broken. However, to the best of my knowledge, >> SMP currently doesn't owrk on PentiumI systems right now at least in >> current and possibly in stable as well. > > SMP on Pentium Broken? My current dmesg.boot says: > > %%% > ... > FreeBSD 5.1-CURRENT #1: Wed Oct 22 10:44:15 EST 2003 > root@team2.af.speednet.com.au:/usr/obj/usr/src/sys/TEAM2 > Preloaded elf kernel "/boot/kernel/kernel" at 0xc0712000. > Timecounter "i8254" frequency 1193182 Hz quality 0 > CPU: Pentium/P54C (132.00-MHz 586-class CPU) > Origin = "GenuineIntel" Id = 0x52c Stepping = 12 > Features=0x3bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,APIC> > real memory = 100663296 (96 MB) > avail memory = 92332032 (88 MB) > APIC_IO: MP table broken: 8259->APIC entry missing! > Programming 16 pins in IOAPIC #0 > EISA INTCONTROL = 00004400 > IOAPIC #0 intpin 2 -> irq 0 > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs > cpu0 (BSP): apic id: 0, version: 0x00030010, at 0xfee00000 > cpu1 (AP): apic id: 1, version: 0x00030010, at 0xfee00000 > io0 (APIC): apic id: 2, version: 0x000f0011, at 0xfec00000 > Intel Pentium detected, installing workaround for F00F bug > ... > %%% > > team2# uptime > 12:54PM up 1 day, 3:21, 3 users, load averages: 2.58, 3.22, 4.22 > > > I am building world right now to see if latest ULE still locks up.. Hah. Terry has long complained that SMP has worked on PentiumI's for ages. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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