Re: Dual core CPU's, but only 2 CPU's in-use?
Tigger wrote: > The only security advisory I could find was for 5.x and contained info > on how to disable, not enable. > > http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc It's the same security issue, but it's handled differently on 5.x since it's old. See machdep.hyperthreading_allowed sysctl. Also, try benchmarking the system with and without hyperthreading (on the real work the machine will be doing) since in some cases turning on hyperthreading will result in globally lower performance. signature.asc Description: OpenPGP digital signature
Re: Dual core CPU's, but only 2 CPU's in-use?
On Mon, 25 Feb 2008 11:30:13 +0100 Kris Kennaway <[EMAIL PROTECTED]> wrote: > Tigger wrote: > > On Sun, 24 Feb 2008 15:59:49 +0100 > > Kris Kennaway <[EMAIL PROTECTED]> wrote: > > > >> Tigger wrote: > >>> On Sun, 24 Feb 2008 12:46:23 +0100 > >>> Dominic Fandrey <[EMAIL PROTECTED]> wrote: > >>> > Tigger wrote: > > Hello. I have a Xeon system with 2 CPU's installed (dual-cores). > > Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did > > dmesg. > > > > Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is > > only reporting 2 CPUs (CPU 0 and CPU 2). > > > > How do I enabled the second cores on the CPU's or are they > > really running but systat is not reporting the CPU load across > > the cores? > You can run 'top -S' to check how many idle processes exist. If > there are four, everything is fine. > > >>> > >>> Sadly, no luck. Only cpu0 and cpu2 are reported: > >>> > >>> PID USERNAME THR PRI NICE SIZERES STATE C TIME WCPU > >>> COMMAND 11 root1 171 52 0K 8K CPU2 2 143:43 > >>> 92.38% idle: cpu2 13 root1 171 52 0K 8K RUN0 > >>> 142:33 92.04% idle: cpu0 > >> Are your CPUs really dual-core, or single core + hyperthreaded? > >> > >> Kris > >> > > > > Thank you! Your email sent me off to do what I should have done > > first - some research. I assumed (wrongly) that 'Logical CPUs per > > core: 2' meant 'Dual Core', and when I saw the following: > > > > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs > > cpu0 (BSP): APIC ID: 0 > > cpu1 (AP): APIC ID: 1 > > cpu2 (AP): APIC ID: 6 > > cpu3 (AP): APIC ID: 7 > > > > I also thought 'Dual Core', however this is not the case. The CPU's > > are single core with Hyper Threading Tech. > > > > But this research has also lead to some confusion. Its clear there > > are 2 CPU with 2 Logical cores each, but only 2 cores are in use - > > why? > > > > Also, the 'man (4) smp' talks about (possible) performance issues > > with Hyper Threading enabled - does this mean I should set > > 'machdep.hlt_logical_cpus 1' (it is currently set to 0) - or > > because the Logical Cores are not being used I can forget about > > this? > > hyperthreading is not enabled by default on 6.x. See the security > advisory for discussion and how to enable it. > > Kris > The only security advisory I could find was for 5.x and contained info on how to disable, not enable. http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc Also, 'machdep.hlt_logical_cpus' is already set to 0 (I'm assuming the 'hlt' means 'halt' in the sysctl switch). -Tig ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dual core CPU's, but only 2 CPU's in-use?
Tigger wrote: On Sun, 24 Feb 2008 15:59:49 +0100 Kris Kennaway <[EMAIL PROTECTED]> wrote: Tigger wrote: On Sun, 24 Feb 2008 12:46:23 +0100 Dominic Fandrey <[EMAIL PROTECTED]> wrote: Tigger wrote: Hello. I have a Xeon system with 2 CPU's installed (dual-cores). Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did dmesg. Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only reporting 2 CPUs (CPU 0 and CPU 2). How do I enabled the second cores on the CPU's or are they really running but systat is not reporting the CPU load across the cores? You can run 'top -S' to check how many idle processes exist. If there are four, everything is fine. Sadly, no luck. Only cpu0 and cpu2 are reported: PID USERNAME THR PRI NICE SIZERES STATE C TIME WCPU COMMAND 11 root1 171 52 0K 8K CPU2 2 143:43 92.38% idle: cpu2 13 root1 171 52 0K 8K RUN0 142:33 92.04% idle: cpu0 Are your CPUs really dual-core, or single core + hyperthreaded? Kris Thank you! Your email sent me off to do what I should have done first - some research. I assumed (wrongly) that 'Logical CPUs per core: 2' meant 'Dual Core', and when I saw the following: FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 cpu2 (AP): APIC ID: 6 cpu3 (AP): APIC ID: 7 I also thought 'Dual Core', however this is not the case. The CPU's are single core with Hyper Threading Tech. But this research has also lead to some confusion. Its clear there are 2 CPU with 2 Logical cores each, but only 2 cores are in use - why? Also, the 'man (4) smp' talks about (possible) performance issues with Hyper Threading enabled - does this mean I should set 'machdep.hlt_logical_cpus 1' (it is currently set to 0) - or because the Logical Cores are not being used I can forget about this? hyperthreading is not enabled by default on 6.x. See the security advisory for discussion and how to enable it. Kris ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dual core CPU's, but only 2 CPU's in-use?
On Sun, 24 Feb 2008 15:59:49 +0100 Kris Kennaway <[EMAIL PROTECTED]> wrote: > Tigger wrote: > > On Sun, 24 Feb 2008 12:46:23 +0100 > > Dominic Fandrey <[EMAIL PROTECTED]> wrote: > > > >> Tigger wrote: > >>> Hello. I have a Xeon system with 2 CPU's installed (dual-cores). > >>> Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did > >>> dmesg. > >>> > >>> Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is > >>> only reporting 2 CPUs (CPU 0 and CPU 2). > >>> > >>> How do I enabled the second cores on the CPU's or are they really > >>> running but systat is not reporting the CPU load across the cores? > >> You can run 'top -S' to check how many idle processes exist. If > >> there are four, everything is fine. > >> > > > > > > Sadly, no luck. Only cpu0 and cpu2 are reported: > > > > PID USERNAME THR PRI NICE SIZERES STATE C TIME WCPU > > COMMAND 11 root1 171 52 0K 8K CPU2 2 143:43 > > 92.38% idle: cpu2 13 root1 171 52 0K 8K RUN0 > > 142:33 92.04% idle: cpu0 > > Are your CPUs really dual-core, or single core + hyperthreaded? > > Kris > Thank you! Your email sent me off to do what I should have done first - some research. I assumed (wrongly) that 'Logical CPUs per core: 2' meant 'Dual Core', and when I saw the following: FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 cpu2 (AP): APIC ID: 6 cpu3 (AP): APIC ID: 7 I also thought 'Dual Core', however this is not the case. The CPU's are single core with Hyper Threading Tech. But this research has also lead to some confusion. Its clear there are 2 CPU with 2 Logical cores each, but only 2 cores are in use - why? Also, the 'man (4) smp' talks about (possible) performance issues with Hyper Threading enabled - does this mean I should set 'machdep.hlt_logical_cpus 1' (it is currently set to 0) - or because the Logical Cores are not being used I can forget about this? -Tig ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dual core CPU's, but only 2 CPU's in-use?
Tigger wrote: On Sun, 24 Feb 2008 12:46:23 +0100 Dominic Fandrey <[EMAIL PROTECTED]> wrote: Tigger wrote: Hello. I have a Xeon system with 2 CPU's installed (dual-cores). Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did dmesg. Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only reporting 2 CPUs (CPU 0 and CPU 2). How do I enabled the second cores on the CPU's or are they really running but systat is not reporting the CPU load across the cores? You can run 'top -S' to check how many idle processes exist. If there are four, everything is fine. Sadly, no luck. Only cpu0 and cpu2 are reported: PID USERNAME THR PRI NICE SIZERES STATE C TIME WCPU COMMAND 11 root1 171 52 0K 8K CPU2 2 143:43 92.38% idle: cpu2 13 root1 171 52 0K 8K RUN0 142:33 92.04% idle: cpu0 Are your CPUs really dual-core, or single core + hyperthreaded? Kris ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dual core CPU's, but only 2 CPU's in-use?
On Sun, 24 Feb 2008 12:46:23 +0100 Dominic Fandrey <[EMAIL PROTECTED]> wrote: > Tigger wrote: > > Hello. I have a Xeon system with 2 CPU's installed (dual-cores). > > Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did > > dmesg. > > > > Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only > > reporting 2 CPUs (CPU 0 and CPU 2). > > > > How do I enabled the second cores on the CPU's or are they really > > running but systat is not reporting the CPU load across the cores? > > You can run 'top -S' to check how many idle processes exist. If there > are four, everything is fine. > Sadly, no luck. Only cpu0 and cpu2 are reported: PID USERNAME THR PRI NICE SIZERES STATE C TIME WCPU COMMAND 11 root1 171 52 0K 8K CPU2 2 143:43 92.38% idle: cpu2 13 root1 171 52 0K 8K RUN0 142:33 92.04% idle: cpu0 -Tig ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dual core CPU's, but only 2 CPU's in-use?
Tigger wrote: Hello. I have a Xeon system with 2 CPU's installed (dual-cores). Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did dmesg. Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only reporting 2 CPUs (CPU 0 and CPU 2). How do I enabled the second cores on the CPU's or are they really running but systat is not reporting the CPU load across the cores? You can run 'top -S' to check how many idle processes exist. If there are four, everything is fine. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Dual core CPU's, but only 2 CPU's in-use?
Hello. I have a Xeon system with 2 CPU's installed (dual-cores). Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did dmesg. Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only reporting 2 CPUs (CPU 0 and CPU 2). How do I enabled the second cores on the CPU's or are they really running but systat is not reporting the CPU load across the cores? dmesg from 6.3 (snipped): CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2790.73-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf29 Stepping = 9 Features=0xbfebfbff Features2=0x4400 Logical CPUs per core: 2 real memory = 2147352576 (2047 MB) avail memory = 2096242688 (1999 MB) ACPI APIC Table: FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 cpu2 (AP): APIC ID: 6 cpu3 (AP): APIC ID: 7 And sysctrl dev.cpu is interesting, the 4 CPUs are found but only 2 appear to be working (cx_usage is 100% or 0%): # sysctl dev.cpu dev.cpu.0.%desc: ACPI CPU dev.cpu.0.%driver: cpu dev.cpu.0.%location: handle=\_PR_.CPU0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%parent: acpi0 dev.cpu.0.cx_supported: C1/0 dev.cpu.0.cx_lowest: C1 dev.cpu.0.cx_usage: 100.00% dev.cpu.1.%desc: ACPI CPU dev.cpu.1.%driver: cpu dev.cpu.1.%location: handle=\_PR_.CPU1 dev.cpu.1.%pnpinfo: _HID=none _UID=0 dev.cpu.1.%parent: acpi0 dev.cpu.1.cx_supported: C1/0 dev.cpu.1.cx_lowest: C1 dev.cpu.1.cx_usage: 0% dev.cpu.2.%desc: ACPI CPU dev.cpu.2.%driver: cpu dev.cpu.2.%location: handle=\_PR_.CPU2 dev.cpu.2.%pnpinfo: _HID=none _UID=0 dev.cpu.2.%parent: acpi0 dev.cpu.2.cx_supported: C1/0 dev.cpu.2.cx_lowest: C1 dev.cpu.2.cx_usage: 100.00% dev.cpu.3.%desc: ACPI CPU dev.cpu.3.%driver: cpu dev.cpu.3.%location: handle=\_PR_.CPU3 dev.cpu.3.%pnpinfo: _HID=none _UID=0 dev.cpu.3.%parent: acpi0 dev.cpu.3.cx_supported: C1/0 dev.cpu.3.cx_lowest: C1 dev.cpu.3.cx_usage: 0% Thanks for any pointers on this one! -Tig ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
