hi,
I have FreeBSD 4.9-RELEASE-p1 #0: Tue Dec 9 16:46:46 CET 2003 and as I have
dual P4 @2.4GHz I was wondering about HyperThreading(tm). In UPDATING I read:
20031022:
Support for HyperThread logical CPUs has now been enabled by
default. As a result, the HTT kernel option no longer exists.
Instead, the logical CPUs are always started so that they can
handle interrupts. However, the extra logical CPUs are prevented
from executing user processes by default. To enable the logical
CPUs, change the value of the machdep.hlt_logical_cpus from 1 to
0. This value can also be set from the loader as a tunable of
the same name.
but it seems like there is no such sysctl oid:
#sysctl machdep. | grep cpu
machdep.cpu_idle_hlt: 1
machdep.smp_cpus: 4
machdep.hlt_cpus: 0
so I have no oid set in /etc/sysctl.conf or loader.conf
nevertheless, the system seems to work out of the box:
CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2393.19-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf25 Stepping = 5
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,
SSE,SSE2,SS,HTT,TM,PBE>
Hyperthreading: 2 logical CPUs
...
FreeBSD/SMP: Multiprocessor motherboard: 4 CPUs
cpu0 (BSP): apic id: 0, version: 0x00050014, at 0xfee00000
cpu1 (AP): apic id: 6, version: 0x00050014, at 0xfee00000
cpu2 (AP): apic id: 1, version: 0x00050014, at 0xfee00000
cpu3 (AP): apic id: 7, version: 0x00050014, at 0xfee00000
io0 (APIC): apic id: 4, version: 0x000f0011, at 0xfec00000
io1 (APIC): apic id: 5, version: 0x000f0011, at 0xfec01000
...
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #1 Launched!
and 'top' confirms that processes are running on CPU 0 through 3
shouldn't be UPDATING corrected?
Buki
--
PGP public key: http://dev.null.cz/buki.asc
/"\
\ / ASCII Ribbon Campaign
X Against HTML & Outlook Mail
/ \ http://www.thebackrow.net
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url :
http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20040114/6dd85e26/attachment.bin