Date: Wed, 21 Apr 2010 19:22:00 +0200 (CEST) From: Alexander Best <alexbestms@wwu.de> To: Roman Divacky <rdivacky@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: [CFT]: ClangBSD is selfhosting, we need testers now Message-ID: <permail-201004211722001e86ffa800003aa3-a_best01@message-id.uni-muenster.de> In-Reply-To: <20100421152338.GA77210@freebsd.org>
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This is a MIME encoded multipart message. --+permail-201004211722001e86ffa800003aa3-a_best01+ Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Roman Divacky schrieb am 2010-04-21: > On Wed, Apr 21, 2010 at 05:20:57PM +0200, Alexander Best wrote: > > i might have stumbled upon a problem with clang. i've compiled a > > kernel from > > the clang branch using `make kernel INSTKERNNAME=clang` and booted > > from it. > > i'm now experiencing audio problems with mp3s and certain video > > files. > > playback is awfully slow and the audio output gets distorted > > massively. `top` > > however reports no high cpu load and `vmstat -i` doesn't report > > anything > > unusual either. > > this problem doesn't occur with a regular gcc-kernel. > > both kernels are running under a regular (gcc) world. > > i thought it might be a problem with acpi, but disabling acpi > > (hint.acpi.0.disabled=1) gives me a system freeze. > I've heard about this problem but did not manage to reproduce that. > can you try to bisect what file is being miscompiled? ie. compile > half of the kernel with gcc and half with clang and bisect this > way to a single file. > we can work from there... i've identified the problem to be somewhere in sys/dev/sound. i've removed "device sound" and "device hda_snd" from my kernel config and rebuild/reinstalled both kernels (gcc and clang). i then booted the clang kernel and loaded various sound.ko and snd_hda.ko combination. here're the results: sound.ko (clang) snd_hda.ko (clang) => BROKEN sound.ko (clang) snd_hda.ko (gcc) => BROKEN sound.ko (gcc) snd_hda.ko (gcc) => OK sound.ko (gcc) snd_hda.ko (clang) => OK i've attached a log documenting all clang warnings that get issued when building sys/modules/sound. in addition to those warnings i get a lot of these, but i guess they aren't harmful: clang: warning: argument unused during compilation: '-funroll-loops' clang: warning: argument unused during compilation: '-finline-limit=8000' clang: warning: argument unused during compilation: '--param inline-unit-growth=100' clang: warning: argument unused during compilation: '--param large-function-growth=1000' clang: warning: argument unused during compilation: '-mfpmath=387' clang: warning: argument unused during compilation: '-fformat-extensions' clang: warning: argument unused during compilation: '-funroll-loops' clang: warning: argument unused during compilation: '-finline-limit=8000' clang: warning: argument unused during compilation: '--param inline-unit-growth=100' clang: warning: argument unused during compilation: '--param large-function-growth=1000' clang: warning: argument unused during compilation: '-mfpmath=387' -- Alexander Best --+permail-201004211722001e86ffa800003aa3-a_best01+ Content-Type: text/plain Content-Transfer-Encoding: Base64 Content-Disposition: attachment; filename="sound.log.txt" L3Vzci9sb2NhbC9zcmMvY2xhbmdic2Qvc3lzL21vZHVsZXMvc291bmQvc291bmQvLi4vLi4vLi4v 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