Date: Wed, 19 Mar 2008 22:08:25 +0100 From: Daniel Gerzo <danger@FreeBSD.org> To: Mike Tancsa <mike@sentex.net> Cc: Jeremy Chadwick <koitsu@freebsd.org>, freebsd-stable@freebsd.org Subject: Re[2]: Weird system cpu usage Message-ID: <1839488629.20080319220825@rulez.sk> In-Reply-To: <200803192034.m2JKYFmL087217@lava.sentex.ca> References: <669936444.20080319100148@rulez.sk> <200803191753.m2JHraI5092556@lurza.secnetix.de> <20080319180629.GA29308@eos.sc1.parodius.com> <200803192034.m2JKYFmL087217@lava.sentex.ca>
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Hello Mike, Wednesday, March 19, 2008, 9:32:13 PM, you wrote: >>Also, I believe there was a report from another user who saw similar >>issues with em(4), and found that disabling MSI fixed the storm in >>question. I believe you can disable MSI/MSIX by placing the following >>in /boot/loader.conf, then reboot: >> >>hw.pci.enable_msi="0" >>hw.pci.enable_msix="0" > When MSI is enabled, the irq will be a strangely high number. e.g. Interesting, I have disabled MSI and MSIX support, but they still share the same irq. However, I don't know yet if the interrupt storm is going to be resolved, it needs some time (It always used to take some time until it has showed up). > If anything, I found enabling MSI helped matters where I saw strange > IRQ issues. However, not sure if the original poster's hardware > supports it. One thing it does remind me of is some strange IRQ > issues I had on an AMD board where a USB setting for "legacy handoff" > (something like that) would really slow down the machine with an in > inordinate amount of IRQs firing. I forget if I had to enable it or > disable it to fix the problem. If anything, I would try disabling > USB all together if its not being used even though its not figuring > in the above really high rate of IRQs. The USB isn't indeed used, I will think about disabling it, and also about trying to move around the em(4) NICs to the other slots. Unfortunately I don't have a physical access to the given maschine. -- Best regards, Daniel mailto:danger@FreeBSD.org
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