Messages in this thread | | | Date | Wed, 03 Dec 2003 18:41:36 -0500 | From | Ethan Weinstein <> | Subject | Re: HT apparently not detected properly on 2.4.23 |
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William Lee Irwin III wrote:
> On Wed, Dec 03, 2003 at 01:46:38PM -0500, Ethan Weinstein wrote: > >>With 2.4.22, my Supermicro X5DPL-iGM-O (E7501 chipset) with 2 >>xeons@2.4ghz and hypertherading enabled shows 4 cpu's in >>/proc/cpuinfo|proc/interrupts, with: >>CONFIG_ACPI=y >>CONFIG_ACPI_HT_ONLY=y >>The same config with 2.4.23 only shows 2 cpus, even with: >>CONFIG_NR_CPUS=4 >>Also, I believe this has been reported before, but the system only seems >>to interrupt on CPU0 with either kernel, unless I apply a patch I found >>here: >>http://www.hardrock.org/kernel/2.4.22/irqbalance-2.4.22-MRC.patch >>or run the `irqbalance' program.. which I don't care to do. This >>problem _seems_ to be isolated to the Supermicro, as HT does seem >>properly detected on several other SMP systems I have at work (compaq >>ML370/ML380) with 2.4.23 > > You probably have sparse physical APIC ID's. > Ok, setting CONFIG_NR_CPUS=8 does indeed solve the HT issue, looks like it was the numbering scheme:
Dec 3 18:32:28 spicymeatball kernel: CPU 0 (0x0000) enabled Dec 3 18:32:28 spicymeatball kernel: Processor #0 Pentium 4(tm) XEON(tm) APIC version 16 Dec 3 18:32:28 spicymeatball kernel: LAPIC (acpi_id[0x0001] id[0x6] enabled[1]) Dec 3 18:32:28 spicymeatball kernel: CPU 1 (0x0600) enabled Dec 3 18:32:28 spicymeatball kernel: Processor #6 Pentium 4(tm) XEON(tm) APIC version 16 Dec 3 18:32:28 spicymeatball kernel: LAPIC (acpi_id[0x0002] id[0x1] enabled[1]) Dec 3 18:32:28 spicymeatball kernel: CPU 2 (0x0100) enabled Dec 3 18:32:28 spicymeatball kernel: Processor #1 Pentium 4(tm) XEON(tm) APIC version 16 Dec 3 18:32:28 spicymeatball kernel: LAPIC (acpi_id[0x0003] id[0x7] enabled[1]) Dec 3 18:32:28 spicymeatball kernel: CPU 3 (0x0700) enabled Dec 3 18:32:28 spicymeatball kernel: Processor #7 Pentium 4(tm) XEON(tm) APIC version 16
But we're still only interrupting on CPU0 with this kernel.
-Ethan
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