[gentoo-user] Hyperthreading
I haven't been able to find clear info on Hyperthreading, but from what I can tell it appears that with Hyperthreading On; 1. per core performance is slightly reduced 2. you can run two threads per core, but there is some contention between threads So, generally, if you have less busy threads than cores, you should leave it off and if you have more busy threads than cores you should turn it on. Does that sound right? I assume that newer Nehalem/Core i7 HT (otherwise known as simultaneous multi-threading, SMT) just has less contention between threads than the older P4 HT, but the busy threads vs core principle remains.
Re: [gentoo-user] Hyperthreading
On Tuesday 10 May 2011 12:28:01 Adam Carter wrote: I haven't been able to find clear info on Hyperthreading, but from what I can tell it appears that with Hyperthreading On; 1. per core performance is slightly reduced Not in all circumstances... 2. you can run two threads per core, but there is some contention between threads Not in all circumstances... So, generally, if you have less busy threads than cores, you should leave it off and if you have more busy threads than cores you should turn it on. Does that sound right? Nope :) HT is based on the theory that not all threads are the same. That means that certain parts of a core can be kept busy with a completely different task. If the system is used for lots of different things simultaneously, then HT can lead to better performance. However, if the system is doing a lot of identical calculations, then performance will actually be less as the CPU is trying to find tasks that can use unused parts. These are, in this case, extremely rare as the vast majority of CPU-tasks are identical. I assume that newer Nehalem/Core i7 HT (otherwise known as simultaneous multi-threading, SMT) just has less contention between threads than the older P4 HT, but the busy threads vs core principle remains. HT is still based on the same theory as it was when it was first introduced. The algorithms are probably improved, but the same problem will occur. In general, for a desktop or server that is doing a lot of different things, HT is likely to improve performance. If the server is dedicated to a single service, there is a distinct chance HT will lead to decreased performance. -- Joost
Re: [gentoo-user] Hyperthreading
In general, for a desktop or server that is doing a lot of different things, HT is likely to improve performance. If the server is dedicated to a single service, there is a distinct chance HT will lead to decreased performance. Thanks Joost! That certainly helps.
[gentoo-user] hyperthreading
just did a reinstall of my gentoo box, (been almost a year or so) and for some reason this time around it doesnt see my hyperthreading p4 as two cpu's anymore, i have hyperthreading and smp support turned on in the kernel like i had before. is this normal? what can i do to get gentoo to see this machine as an smp machine again? thanks Nick -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
Are you viewing /proc/cpuinfo to get that information or just watching as it boots? Also, what do you get if you do this: grep -i 'smp' /boot/config If you don't have a symbolic link from /boot/config to your kernel config you will have to change the path somewhat (for example, /boot/config-2.6.14-gentoo-r2 if you are using the 2.6.14-r2 gentoo sources). This should give you a result similar to the following: CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y Hope this helps. Jeff On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote: just did a reinstall of my gentoo box, (been almost a year or so) and for some reason this time around it doesnt see my hyperthreading p4 as two cpu's anymore, i have hyperthreading and smp support turned on in the kernel like i had before. is this normal? what can i do to get gentoo to see this machine as an smp machine again? thanks Nick -- gentoo-user@gentoo.org mailing list -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
On 12/13/05, Jeff Williams [EMAIL PROTECTED] wrote: Are you viewing /proc/cpuinfo to get that information or just watching as it boots? Also, what do you get if you do this: i was actually watching 'top' i could never get the smp function to work. here is what cpuinfo gives: mail ~ # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping: 9 cpu MHz : 2793.380 cache size : 512 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 1 fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : 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 ht tm pbe cid xtpr bogomips: 5593.96 grep -i 'smp' /boot/config this is my boot/config grepped: mail ~ # grep -i 'smp' /boot/config # CONFIG_X86_BIGSMP is not set CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y If you don't have a symbolic link from /boot/config to your kernel config you will have to change the path somewhat (for example, /boot/config-2.6.14-gentoo-r2 if you are using the 2.6.14-r2 gentoo sources). This should give you a result similar to the following: CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y Hope this helps. Jeff seems to look correct doesnt it? its just not showing up as two cpus, :-\ what do you think? -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote: seems to look correct doesnt it? its just not showing up as two cpus, :-\ what do you think? I think HT support is tied somehow to ACPI. Do you have ACPI support built into your kernel? -Richard -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote: On 12/13/05, Jeff Williams [EMAIL PROTECTED] wrote: Are you viewing /proc/cpuinfo to get that information or just watching as it boots? Also, what do you get if you do this: i was actually watching 'top' i could never get the smp function to work. In top what happens when you hit the number '1'? here is what cpuinfo gives: mail ~ # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping: 9 cpu MHz : 2793.380 cache size : 512 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 1 fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : 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 ht tm pbe cid xtpr bogomips: 5593.96 I see both 'processors': [EMAIL PROTECTED] ~ $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping: 3 cpu MHz : 2995.432 cache size : 1024 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 1 fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : 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 ht tm pbe pni monitor ds_cpl cid bogomips: 5998.45 processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping: 3 cpu MHz : 2995.432 cache size : 1024 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 1 fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : 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 ht tm pbe pni monitor ds_cpl cid bogomips: 5990.23 [EMAIL PROTECTED] ~ $ grep -i 'smp' /boot/config this is my boot/config grepped: mail ~ # grep -i 'smp' /boot/config # CONFIG_X86_BIGSMP is not set CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y [EMAIL PROTECTED] ~ $ grep -i 'smp' /usr/src/linux/.config # CONFIG_X86_BIGSMP is not set CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y [EMAIL PROTECTED] ~ $ seems to look correct doesnt it? its just not showing up as two cpus, :-\ what do you think? Seems a bit strange to me. - Mark -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
In top what happens when you hit the number '1'? it only lists the one cpu. Seems a bit strange to me. - Mark its a server, i dont think i built ACPI into the kernel cause i didnt need/want it, dont think that should make a difference. -- gentoo-user@gentoo.org mailing list -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
Richard Fish wrote: On 12/13/05, Nick Smith [EMAIL PROTECTED] wrote: its a server, i dont think i built ACPI into the kernel cause i didnt need/want it, dont think that should make a difference. I think it does. At least, there is an acpi=ht boot option for the kernel that says to enable just enough of ACPI to get hyperthreading working. So I think you need some level of ACPI support. I was setting up two new servers today and noticed that they both were not recognizing the HT cpus. I enabled ACPI, rebooted, and now they show up. This appears to be a new thing in 2.6.14 as my 2.6.13 box sees the HT cpus without ACPI. Here's my working config, though you may be able to strip it down some more. # Power management options (ACPI, APM) # ACPI (Advanced Configuration and Power Interface) Support CONFIG_ACPI=y CONFIG_ACPI_AC=y CONFIG_ACPI_BATTERY=y CONFIG_ACPI_BUTTON=y CONFIG_ACPI_VIDEO=y # CONFIG_ACPI_HOTKEY is not set CONFIG_ACPI_FAN=y CONFIG_ACPI_PROCESSOR=y CONFIG_ACPI_THERMAL=y # CONFIG_ACPI_ASUS is not set # CONFIG_ACPI_IBM is not set # CONFIG_ACPI_TOSHIBA is not set CONFIG_ACPI_BLACKLIST_YEAR=0 # CONFIG_ACPI_DEBUG is not set CONFIG_ACPI_EC=y CONFIG_ACPI_POWER=y CONFIG_ACPI_SYSTEM=y kashani -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
On 12/13/05, Glenn Enright [EMAIL PROTECTED] wrote: On Wednesday 14 December 2005 09:29, Nick Smith wrote: its a server, i dont think i built ACPI into the kernel cause i didnt need/want it, dont think that should make a difference. From what I can see SMP functoinality seems to rely quite heavily on ACPI discovery. Having said that, lots of code in mpparse.c says it should just work like in previous versions. Is this the first time building this kernel version? probably, i will try adding ACPI support and see what i get, thanks for the suggestions. What does 'dmesg | grep CPU' say? anything in /var/log/syslog.log? mail ~ # dmesg | grep CPU Initializing CPU#0 CPU: After generic identify, caps: bfebfbff 4400 CPU: After vendor identify, caps: bfebfbff 4400 CPU: Trace cache: 12K uops, L1 D cache: 8K CPU: L2 cache: 512K CPU: Physical Processor ID: 0 CPU: After all inits, caps: bfebfbff 0080 4400 Intel machine check reporting enabled on CPU#0. CPU0: Intel P4/Xeon Extended MCE MSRs (12) available CPU0: Thermal monitoring enabled CPU0: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 09 Brought up 1 CPUs Have you added any extra patches to the kernel recently? nope -- The sounds of the nouns are mostly unbound. In town a noun might wear a gown, or further down, might dress a clown. A noun that's sound would never clown, but unsound nouns jump up and down. The sound of a noun could distrub the plowing, and then, my dear, you'd be put in the pound. But please don't let that get you down, the renown of your gown is the talk of the town. -- A. Nonnie Mouse -- gentoo-user@gentoo.org mailing list -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] hyperthreading
thanks to everyone that helped, ya'll are gods, that got me working with smp/HT thanks again Nick -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] HyperThreading won't activate
On Wed, 2005-10-19 at 23:55 -0400, Statux wrote: Hello all. I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those of you who know of the Intel Processor Numbers) - kernel 2.6.13. I have a 3.0GHz P4 HT in my laptop, with HT working fine(ish) on 2.6.13 I did some random grepping over my config file, and found these results: # CONFIG_X86_BIGSMP is not set CONFIG_SMP=y CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_SMP=y CONFIG_ACPI_PROCESSOR=y CONFIG_NR_CPUS=2 This is what /proc/cpuinfo shows: mine definately shows processor 0 and processor 1. Also have a look at /proc/acpi/processor/. I have CPU0 and CPU1. I've been reading about CPU Enumeration something-or-other but I've gathered that that option has been removed from the menus since the earlier 2.6 kernels. I'm not sure what bearing it would have on my current situation. I did recall that I had ACPI turned off in BIOS which logically should be on for the kernel to get any hardware backing but enabling it caused my keyboard to work up until a few seconds after the login prompt comes up. After that, it locks up (LEDs don't toggle). Is it a USB keyboard? did you enable usb legacy support in the bios? Everything else appears to work but I have to hard reboot the system. I've since turned ACPI support off in BIOS. don't know if you need this on. while we're on bios settings, see if you can turn HT on and off in the bios. I have an option for it. I don't know if any of this will help you, cause I don't know what your problem is! Hope something helps though. Feel free to ask for more info about my system. -- Iain Buchanan [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] HyperThreading won't activate
On Thu, 2005-10-20 at 15:27 +0930, Iain Buchanan wrote: [snip] CONFIG_ACPI_PROCESSOR=y CONFIG_NR_CPUS=2 You've probably got certain things selected under ACPI because you're using a laptop. This is merely a desktop system so all I really need to do, as far as I know - correct me if I'm wrong, is to enable the section and I should get what I need with it. Enabling APM on my old system gave me the pretty power off thing and that's all I wanted/needed from that. This is what /proc/cpuinfo shows: mine definately shows processor 0 and processor 1. Also have a look at /proc/acpi/processor/. I have CPU0 and CPU1. Mine's just not showing up under /proc/cpuinfo. I don't have an acpi section under /proc at the moment. ACPI must not be running right now, then. [snip] Is it a USB keyboard? did you enable usb legacy support in the bios? It's a PS/2 keyboard. Same problem occurs with USB KB support on and off in BIOS. while we're on bios settings, see if you can turn HT on and off in the bios. I have an option for it. I have the option and it's enabled. -- Iain Buchanan [EMAIL PROTECTED] -- Statux [EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
On Wed, 2005-10-19 at 21:25 -0700, Richard Fish wrote: [snip] Try adding acpi=ht to your kernel command line, which will enable just enough of ACPI to get hyperthreading working. I tried adding that and the kernel recognises that I've tried the option but ACPI still won't start up (I even recompiled the kernel and added the processor section under ACPI just in case some code was left out but I get the same results). This is what dmesg shows everytime: [snip] ACPI: Unable to locate RSDP Intel MultiProcessor Specification v1.4 Virtual Wire compatibility mode. OEM ID: OEM0 Product ID: PROD APIC at: 0xFEE0 Processor #0 15:4 APIC version 17 I/O APIC #2 Version 17 at 0xFEC0. Enabling APIC mode: Flat. Using 1 I/O APICs Processors: 1 Allocating PCI resources starting at 2000 (gap: 2000:dec0) Built 1 zonelists Kernel command line: auto BOOT_IMAGE=gentoo ro root=303 acpi=ht mapped APIC to d000 (fee0) mapped IOAPIC to c000 (fec0) Initializing CPU#0 PID hash table entries: 4096 (order: 12, 65536 bytes) Detected 2993.004 MHz processor. Using tsc for high-res timesource Console: colour VGA+ 80x25 Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 514284k/524288k available (2924k kernel code, 9488k reserved, 1105k data , 216k init, 0k highmem) Checking if this processor honours the WP bit even in supervisor mode... Ok. Calibrating delay using timer specific routine.. 5993.62 BogoMIPS (lpj=11987252) Mount-cache hash table entries: 512 CPU: After generic identify, caps: bfebfbff 2000 641d CPU: After vendor identify, caps: bfebfbff 2000 641d 0 000 monitor/mwait feature present. using mwait in idle threads. CPU: Trace cache: 12K uops, L1 D cache: 16K CPU: L2 cache: 1024K CPU: Physical Processor ID: 0 CPU: After all inits, caps: bfebfbff 2000 0080 641d 000 0 Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. CPU0: Intel P4/Xeon Extended MCE MSRs (24) available CPU0: Thermal monitoring enabled mtrr: v2.0 (20020519) Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Checking 'hlt' instruction... OK. CPU0: Intel(R) Pentium(R) 4 CPU 3.00GHz stepping 01 Total of 1 processors activated (5993.62 BogoMIPS). ENABLING IO-APIC IRQs ..TIMER: vector=0x31 pin1=2 pin2=0 Brought up 1 CPUs NET: Registered protocol family 16 PCI: PCI BIOS revision 2.10 entry at 0xfb360, last bus=2 PCI: Using configuration type 1 ACPI: Subsystem revision 20050408 ACPI: Interpreter disabled. [snip] So I currently don't know what RSDP is, though I'm hunting around for the definition. Any other ideas? Why is this harder than it should be? This processor does actually do HT but I've been unable to manage it :) Help! -- Statux [EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
On Wednesday 19 October 2005 10:55 pm, Statux wrote: I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those of you who know of the Intel Processor Numbers) - kernel 2.6.13. I've enabled SMP and the HT scheduling option in the kernel config along with ACPI as I was told that it's a requirement in order to get HT to work. Yes, HT is enabled in BIOS. After compiling, installing, rebooting, etc, I don't see any changes. This is what /proc/cpuinfo shows: This sounds kinda dumb, but I would pull out a gentoo live CD and see if it detects it. If it doesnt, there is something bios/hardware wise wrong with your setup, if it does, we can start going through kernel wise.. It always helps to eliminate things. Jeff pgp722CM8jrZO.pgp Description: PGP signature
Re: [gentoo-user] HyperThreading won't activate
Statux wrote: Hello all. I've done a fair amount of research in order to try and solve the issue of my HyperThreading not getting enabled. I, however, have not gotten anywhere with it. I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those of you who know of the Intel Processor Numbers) - kernel 2.6.13. I've enabled SMP and the HT scheduling option in the kernel config along with ACPI as I was told that it's a requirement in order to get HT to work. Yes, HT is enabled in BIOS. After compiling, installing, rebooting, etc, I don't see any changes. This is what /proc/cpuinfo shows: I had a very similar chip (3.2Ghz only diff) in a laptop. After trying for a long while, I finally figured out that even though the 531 is stated to support HT, that that particular laptop didn't. There was no way I could enable it. (Didn't work with any OS, windows, livecd or whatever). It just wasn't there for me. You may check into that possiblility before wasting too much time tweeking kernel options. -Dennis -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] HyperThreading won't activate
On Thu, 2005-10-20 at 15:46 -0600, Dennis wrote: You may check into that possiblility before wasting too much time tweeking kernel options. This motherboard, BIOS, and CPU all do support it. The problem seems to be that ACPI fails to start for some reason. Solving that should fix everything. I am going to try to boot a LiveCD and see if any of that helps. That will all hinge on whether or not Gentoo LiveCDs have full SMP support. We'll find out. -- Statux [EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
On Thu, 2005-10-20 at 16:15 -0500, Jeff Smelser wrote: This sounds kinda dumb, but I would pull out a gentoo live CD and see if it detects it. If it doesnt, there is something bios/hardware wise wrong with your setup, if it does, we can start going through kernel wise.. Interesting news, here. I booted into the LiveCD and it did not change anything. HOWEVER, I did try once again to enable BIOS ACPI support. I booted, keyboard stopped working, but I checked logs on the next boot and found out that it did bring up both CPU entries - found ACPI and everything. Oct 20 20:23:31 statux ACPI: RSDP (v000 IntelR) @ 0x000f6bf0 Oct 20 20:23:31 statux ACPI: RSDT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x) @ 0x1fff3040 Oct 20 20:23:31 statux ACPI: FADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x) @ 0x1fff30c0 Oct 20 20:23:31 statux ACPI: MADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x) @ 0x1fff7280 Oct 20 20:23:31 statux ACPI: DSDT (v001 INTELR AWRDACPI 0x1000 MSFT 0x010e) @ 0x Oct 20 20:23:31 statux ACPI: Local APIC address 0xfee0 Oct 20 20:23:31 statux ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled) Oct 20 20:23:31 statux Processor #0 15:4 APIC version 20 Oct 20 20:23:31 statux ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled) Oct 20 20:23:31 statux Processor #1 15:4 APIC version 20 Oct 20 20:23:31 statux ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1]) Oct 20 20:23:31 statux ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) Oct 20 20:23:31 statux Using ACPI for processor (LAPIC) configuration information Oct 20 20:23:31 statux Intel MultiProcessor Specification v1.4 Oct 20 20:23:31 statux Virtual Wire compatibility mode. Oct 20 20:23:31 statux OEM ID: OEM0 Product ID: PROD APIC at: 0xFEE0 Oct 20 20:23:31 statux I/O APIC #2 Version 17 at 0xFEC0. Oct 20 20:23:31 statux Enabling APIC mode: Flat. Using 1 I/O APICs Oct 20 20:23:31 statux Processors: 2 I can't test this any further with my disappearing keyboard issue. So now, the problem is: Why does enabling ACPI in the BIOS kill my keyboard sometime after boot. It works before it hits the OS. It's like the PS/2 port drops. Sounds like an interrupt issue. I know, a USB keyboard would possibly solve the issue but I'm interested in solving the issue and not working around it. -- Statux [EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
On 10/20/05, Statux [EMAIL PROTECTED] wrote: I can't test this any further with my disappearing keyboard issue. I'm not having your SMP problem but I did have the keyboard hang when I first tried going to SMP. In you have a USB keyboard available it will likely not have the problem. Someone on the LKML also suggested a boot option called 'usb-handoff' as a way to get it working, but I haven't tested that as switching to a USB keyboard was easy for me. Hope this helps, Mark -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] HyperThreading won't activate
On Thu, 2005-10-20 at 18:00 -0700, Mark Knecht wrote: I'm not having your SMP problem but I did have the keyboard hang when I first tried going to SMP. In you have a USB keyboard available it will likely not have the problem. Someone on the LKML also suggested a boot option called 'usb-handoff' as a way to get it working, but I haven't tested that as switching to a USB keyboard was easy for me. Well I manage an electronics department somewhere in this world so getting a new keyboard won't be an issue (just a little money). I've been so happy using my Microsoft keyboard which is relatively new ;) -- Statux [EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
On 10/20/05, Statux [EMAIL PROTECTED] wrote: On Thu, 2005-10-20 at 18:00 -0700, Mark Knecht wrote: I'm not having your SMP problem but I did have the keyboard hang when I first tried going to SMP. In you have a USB keyboard available it will likely not have the problem. Someone on the LKML also suggested a boot option called 'usb-handoff' as a way to get it working, but I haven't tested that as switching to a USB keyboard was easy for me. Well I manage an electronics department somewhere in this world so getting a new keyboard won't be an issue (just a little money). I've been so happy using my Microsoft keyboard which is relatively new ;) Might not be more money. I had a wireless keyboard that had a little dongle on it. When I unplugged the dongle the keyboard was actually USB, so for me fixing it didn't even change what my wife was using to type. It just meant plugging it into a different port. Take another look at yours just in case it's the same way. Good luck, Mark -- gentoo-user@gentoo.org mailing list
[gentoo-user] HyperThreading won't activate
Hello all. I've done a fair amount of research in order to try and solve the issue of my HyperThreading not getting enabled. I, however, have not gotten anywhere with it. I've got a 3.0GHz P4 with HyperThreading (Intel 531 processor for those of you who know of the Intel Processor Numbers) - kernel 2.6.13. I've enabled SMP and the HT scheduling option in the kernel config along with ACPI as I was told that it's a requirement in order to get HT to work. Yes, HT is enabled in BIOS. After compiling, installing, rebooting, etc, I don't see any changes. This is what /proc/cpuinfo shows: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping: 1 cpu MHz : 2993.004 cache size : 1024 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 1 fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 3 wp : yes flags : 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 ht tm pbe lm pni monitor ds_cpl cid cx16 xtpr bogomips: 5993.61 I've been reading about CPU Enumeration something-or-other but I've gathered that that option has been removed from the menus since the earlier 2.6 kernels. I'm not sure what bearing it would have on my current situation. I did recall that I had ACPI turned off in BIOS which logically should be on for the kernel to get any hardware backing but enabling it caused my keyboard to work up until a few seconds after the login prompt comes up. After that, it locks up (LEDs don't toggle). Everything else appears to work but I have to hard reboot the system. I've since turned ACPI support off in BIOS. A related power management issue that I should mention is that I used to use APM on my old mobo and with no other sub options enabled, it would cause my system to auto power off at the end of runlevel 0. Neither APM nor ACPI does this for me now (I assume because APM isn't used and ACPI is off and a lil misconfigged on my end, it would seem). Something tells me that all of this is related somehow. Anyway, any help would be greatly appreciated :) I seem to be having a rather unique experience as I've read several accounts of HT issues but all ended up resolved much easier than this has been going. Other information I know that I'll be asked for: Intel 865PE Northbridge Intel ICH5 Southbridge Latest BIOS correct memory installation Thanks! -Statux signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] HyperThreading won't activate
Statux wrote: Hello all. current situation. I did recall that I had ACPI turned off in BIOS which logically should be on for the kernel to get any hardware backing but enabling it caused my keyboard to work up until a few seconds after the login prompt comes up. After that, it locks up (LEDs don't toggle). Everything else appears to work but I have to hard reboot the system. Try adding acpi=ht to your kernel command line, which will enable just enough of ACPI to get hyperthreading working. -Richard -- gentoo-user@gentoo.org mailing list
