From: Andreas Haumer <andreas@xss.co.at>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: 2.4.23, 2.4.24-pre: Interrupt balancing problem
Date: Tue, 23 Dec 2003 13:48:47 +0100 [thread overview]
Message-ID: <3FE839AF.9090904@xss.co.at> (raw)
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Hi!
Interrupt balancing doesn't work anymore on an Asus Dual
Xeon Server (AP1700-S5, ASUS PR-DLS533 MB, Dual Xeon HT).
Last kernel where this worked was 2.4.21-ac:
cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 32414607 32353905 32486435 32470963 IO-APIC-edge timer
1: 1 0 0 1 IO-APIC-edge keyboard
2: 0 0 0 0 XT-PIC cascade
15: 1 0 0 1 IO-APIC-edge ide1
18: 22702419 22631022 22668864 22843971 IO-APIC-level eth0
22: 15021656 15223388 15112963 14929184 IO-APIC-level ioc0
23: 9 7 15 11 IO-APIC-level ioc1
NMI: 0 0 0 0
LOC: 129727116 129727115 129727114 129727114
ERR: 0
MIS: 0
Note that on this particular hardware, I have to boot with
"acpi=off" or "pci=noacpi" in order to get the Fusion MPT
hardware recognized (see my other bug report a few minutes ago)
I didn't check 2.4.22, but with 2.4.23 and 2.4.24-pre2
I get something like the following:
Booted with "acpi=off":
root@tolstoi:~ {502} $ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 41424 0 0 0 IO-APIC-edge timer
1: 2 0 0 0 IO-APIC-edge keyboard
2: 0 0 0 0 XT-PIC cascade
11: 0 0 0 0 IO-APIC-level usb-ohci
18: 8235 0 0 0 IO-APIC-level eth0
22: 34704 0 0 0 IO-APIC-level ioc0
23: 42 0 0 0 IO-APIC-level ioc1
NMI: 0 0 0 0
LOC: 41271 41270 41270 41269
ERR: 0
MIS: 0
Booted with "pci=noacpi":
root@tolstoi:~ {502} $ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 89806 0 0 0 IO-APIC-edge timer
1: 2 0 0 0 IO-APIC-edge keyboard
2: 0 0 0 0 XT-PIC cascade
9: 0 0 0 0 XT-PIC acpi
11: 0 0 0 0 IO-APIC-level usb-ohci
18: 12481 0 0 0 IO-APIC-level eth0
22: 12518 0 0 0 IO-APIC-level ioc0
23: 42 0 0 0 IO-APIC-level ioc1
NMI: 0 0 0 0
LOC: 89651 89650 89650 89650
ERR: 0
MIS: 0
I also tried boot options "noirqbalance" and "acpi_irq_balance",
but interrupts were still served on CPU0 only (SMP is working,
though: I can build the kernel with "make -j4" and as "top" tells
all four logical CPU's are used perfectly well)
Bug or feature?
- - andreas
- --
Andreas Haumer | mailto:andreas@xss.co.at
*x Software + Systeme | http://www.xss.co.at/
Karmarschgasse 51/2/20 | Tel: +43-1-6060114-0
A-1100 Vienna, Austria | Fax: +43-1-6060114-71
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reply other threads:[~2003-12-23 12:48 UTC|newest]
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