Date: Fri, 24 Oct 2008 22:00:45 +0300 From: Alexander Motin <mav@FreeBSD.org> To: freebsd-multimedia@FreeBSD.org Subject: HDA controllers and MSI support. Message-ID: <49021B5D.6070008@FreeBSD.org>
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Hi. I have tried and found that my ICH8-based system successfully supports Message Signaled Interrupts on HDA controller. It allows to avoid interrupt sharing and in theory gives some performance benefits. It is now disabled in driver by default, but can be enabled via hint.hdac.%d.msi device.hints control. You can see that MSI is in use if your hdacX device uses interrupt vector above 255. I am thinking, shouldn't we enable this feature by default? There should be no problem with both supporting and nonsupporting hardware. There could be only problems with broken hardware declaring fake features. So I would like to know, is there any of such cases for HDA hardware or not? -- Alexander Motin
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