Messages in this thread | | | Date | Thu, 26 Feb 2004 16:09:31 +0100 | From | Andreas Steinmetz <> | Subject | [resend] ioapic+shared interrupt+concurrent access=ide lockup |
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I did send a similar message about 3 weeks ago to lkml but there was no reply. The following is related to 2.6.2 (x86-64) though 2.4 shows similar symptoms.
Summary: --------
The ide subsystem locks up on a dual Opteron system when io-apic is enabled and there are concurrent accesses to both ide channels of a pci ide controller card. The lockup occurs on different pci ide controller cards and there are boot parameters that can be used as workarounds.
Details are given below. If additional information is required please contact me. I can currently run any tests required to fix this problem.
Symptoms: ---------
Execute: "dd if=/dev/hde of=/dev/null & ; dd if=/dev/hdg of=/dev/null &"
This results after a short time in:
hde: dma_timer_expiry: dma status == 0x24 hdg: dma_timer_expiry: dma status == 0x24 hde: DMA interrupt recovery hde: lost interrupt hdg: DMA interrupt recovery hdg: lost interrupt hde: dma_timer_expiry: dma status == 0x24 hdg: dma_timer_expiry: dma status == 0x24 hde: DMA interrupt recovery hde: lost interrupt hdg: DMA interrupt recovery hdg: lost interrupt ...
Further accesses to hde and hdg always result then in the same messages as stated above.
The MIS count of /proc/interrupts steadily increases prior to the lockup. It always has the same value as the ide2/ide3 interrupt count on cpu1. Note that no irq balancing is active so there should be no interrupts on cpu1.
During the tests causing the lockup the system is otherwise idle.
Workarounds: ------------
In the cases listed below the lockup does not happen and the MIS count of /proc/interrupts stays at zero.
1. Boot with "noapic" 2. Boot with "ide2=serialize" 3. Boot with "ide3=serialize"
System: -------
Tyan S2885 dual Opteron 246
IDE config: -----------
ide0/hda WD2500JB ide1/hdc WD2500JB ide2/hde WD2500JB ide3/hdg DVD-RW
ide2/ide3 are were tested with the following cards: HPT302, CMD680 and PDC20268 (the latter being now the one in the system). All cards show the same behaviour so it is probably not a driver problem.
It doesn't matter if hdg is a DVD-RW or a hard disk, the problem is the same.
-- Andreas Steinmetz
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