Date: Wed, 4 May 2011 17:34:50 +0200 From: Daan Vreeken <Daan@vehosting.nl> To: Current@FreeBSD.org Cc: Jack Vogel <jfvogel@gmail.com> Subject: Interrupt storm with MSI in combination with em1 Message-ID: <201105041734.50738.Daan@vehosting.nl>
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Hi All, I've just updated a machine to -current (r221321) and since then I'm seeing an interrupt storm on irq 16. The storm goes away when I disable MSI/MSIX with the following lines in "loader.conf" : hw.pci.enable_msix="0" hw.pci.enable_msi="0" According to "dmesg" the following devices share IRQ 16 : pcib1: <ACPI PCI-PCI bridge> irq 16 at device 1.0 on pci0 em0: <Intel(R) PRO/1000 Network Connection 7.2.3> port 0xcc00-0xcc1f mem 0xf7de0000-0xf7dfffff,0xf7d00000-0xf7d7ffff,0xf7ddc000-0xf7ddffff irq 16 at device 0.0 on pci1 vgapci0: <VGA-compatible display> port 0xbc00-0xbc07 mem 0xf7800000-0xf7bfffff,0xe0000000-0xefffffff irq 16 at device 2.0 on pci0 ehci0: <Intel PCH USB 2.0 controller USB-B> mem 0xf7cfa000-0xf7cfa3ff irq 16 at device 26.0 on pci0 em1: <Intel(R) PRO/1000 Network Connection 7.2.3> port 0xec00-0xec1f mem 0xf7fe0000-0xf7ffffff,0xf7f00000-0xf7f7ffff,0xf7fdc000-0xf7fdffff irq 16 at device 0.0 on pci4 pcib4: <ACPI PCI-PCI bridge> irq 16 at device 28.5 on pci0 During a storm "vmstat -i" shows a rate of about 220.000 interrupts/sec. MSI interrupt delivery to both 'em0' and 'em1' seems to work correctly during a storm, as I see their counters increase normally in the "vmstat -i" output. As only 'em0' and 'em1' seem to be using MSI interrupts, my guess is that the e1000 driver is causing this problem. Could it be that the driver forgets to clear/mask legacy interrupts when attaching the MSI interrupts perhaps? Any tips on how to debug and/or fix this? The full output of "dmesg" can be found here : http://vehosting.nl/pub_diffs/dmesg_plantje2_2011_05_04.txt And the full output of "pciconf -lv" is here : http://vehosting.nl/pub_diffs/pciconf_plantje2_2011_05_04.txt Regards, -- Daan Vreeken VEHosting http://VEHosting.nl tel: +31-(0)40-7113050 / +31-(0)6-46210825 KvK nr: 17174380
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