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Date: Tue, 10 Mar 2009 19:59:53 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: Yoshifumi SASAKI <sasaki@ongs.co.jp>
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Cc: freebsd-current@freebsd.org
Subject: Re: Try report: Sony VAIO Type P
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Yoshifumi SASAKI wrote:
>   Sound... succeed to load snd_hda.ko
> 
> hdac0: <Intel SCH High Definition Audio Controller> mem
> 0x942c0000-0x942c3fff irq 11 at device 27.0 on pci0
> hdac0: HDA Driver Revision: 20090215_0128
> hdac0: [ITHREAD]
> hdac0: HDA Codec #0: Realtek ALC262
> pcm0: <HDA Realtek ALC262 PCM #0 Analog> at cad 0 nid 1 on hdac0
> 
>   I receive many messages.And I try to play MP3 data,But not sound.
> 
> interrupt storm detected on "irq5:"; throttling interrupt source
> interrupt storm detected on "irq5:"; throttling interrupt source
> interrupt storm detected on "irq5:"; throttling interrupt source
> interrupt storm detected on "irq5:"; throttling interrupt source

snd_hda supports several interrupt modes: MSI, usual interrupts and 
polling (interruptless operation). The version you have tested uses MSI 
by default. You can switch it to use usual interrupts by setting 
hint.hdac.0.msi=0 in loader.conf, or to use polling by 
dev.hdac.0.polling=1 sysctl. Also you can try latest CURRENT, as there 
were some MSI related changes recently.

-- 
Alexander Motin