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SubjectRe: HT apparently not detected properly on 2.4.23
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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