Interrupt redirection problem
This is the output of /proc/interrupts on a Lion that has been up for 9 days:
CPU0 CPU1 CPU2 CPU3
32: 2226 19 0 0 IO-SAPIC-edge keyboard 33: 2 2 0 0 IO-SAPIC-edge ide1 34: 4 2 0 0 IO-SAPIC-edge ide0 36: 0 0 0 0 IO-SAPIC-edge PS/2 Mouse 44: 1180 131 2 47 IO-SAPIC-edge serial 48: 22811357 1510005 31585 155591 IO-SAPIC-level eth0 54: 0 0 0 0 IO-SAPIC-level usb-uhci 61: 4485678 808931 11218 97495 IO-SAPIC-level qla1280 238: 0 0 0 0 SAPIC perfmon 239: 796793291 796794391 796795076 796794435 SAPIC timer 254: 8256864 11570234 11685908 11611853 SAPIC IPI NMI: 0 0 0 0 ERR: 0
As you can see, cpu0 is processing the majority of interrupts (91%, ignoring the SAPIC interrupts). Why?
Andreas.
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Andreas Schwab "And now for something SuSE Labs completely different." [email protected] SuSE GmbH, Schanzäckerstr. 10, D-90443 Nürnberg Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
Quoted 3 lines · Andreas Schwab
As you can see, cpu0 is processing the majority of interrupts (91%, ignoring the SAPIC interrupts). Why?
This is not the case on my system. On the contrary, CPU3 seems to receive the vast majority of interrupts. (I have "Force IRQ redirection" enabled).
52: 139 1 671 167542 IO-SAPIC-level e100 54: 0 0 0 0 IO-SAPIC-level usb-uhci 57: 0 0 5 8072 IO-SAPIC-level Mylex eXtremeRAID 2000 61: 21 1 1856 66170 IO-SAPIC-level qla1280 63: 0 0 178 3896 IO-SAPIC-level aic7xxx
Martin
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Martin Wilck <[email protected]> FSC EP PS DS1, Paderborn Tel. +49 5251 8 15113
I think it's actually the BSP that processes most of the interrupts. It could be cpu0 on one boot, and another cpu on a subsequent boot.
mikem
-----Original Message-----
From: Martin Wilck [mailto:[email protected]]
Sent: Wednesday, June 27, 2001 3:22 AM
To: Linux-IA64 Mailing list
Subject: Re: [Linux-ia64] Interrupt redirection problem
Quoted 3 lines · Andreas Schwab
As you can see, cpu0 is processing the majority of interrupts (91%, ignoring the SAPIC interrupts). Why?
This is not the case on my system. On the contrary, CPU3 seems to receive the vast majority of interrupts. (I have "Force IRQ redirection" enabled).
52: 139 1 671 167542 IO-SAPIC-level e100 54: 0 0 0 0 IO-SAPIC-level usb-uhci 57: 0 0 5 8072 IO-SAPIC-level Mylex eXtremeRAID 2000 61: 21 1 1856 66170 IO-SAPIC-level qla1280 63: 0 0 178 3896 IO-SAPIC-level aic7xxx
Martin
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Martin Wilck <[email protected]> FSC EP PS DS1, Paderborn Tel. +49 5251 8 15113 _______________________________________________ Linux-IA64 mailing list [email protected] http://lists.linuxia64.org/lists/listinfo/linux-ia64