September 2010 - Darwin-kernel

Re: Error: - 536870181 for VnodeWatcher
by Terry Lambert 29 Sep '10

29 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 28, 2010, at 4:23 AM, sheetal phirke wrote: > Hello All, > > I am executing Vnodewatcher. for sometime i get error as "Error in receiving data: -536870181" for IODataQueueDequeue. > i try to find on post but didn't get useful information. You should have looked in hex: 0xE00002DB: "no space for data" ^ | firewire device You probably have too many things plugged in. Bandwidth is reserved for each driver loaded, so plugging in too many things results in exceeding the bandwidth total. See kIOReturnNoSpace on developer.apple.com: <http://serenity.uncc.edu/web/ADC/2005/Developer_DVD_Series/April/ADC%20Refe…> -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Error: - 536870181 for VnodeWatcher
by sheetal phirke 28 Sep '10

28 Sep '10

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Re: Error in /usr/include/mach/message.h
by Antoine Missout 19 Sep '10

19 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com A FYI follow-up, in any case someone does kernel <-> userspace rpc. Defining __MigKernelSpecificCode instead of _MIG_KERNELSPECIFIC_CODE_ fixes this issue (ie the original header will work fine instead of the patched one), and also has the added advantage of working correctly in 64 bits drivers. It seems the latter define is legacy. - Antoine On May 25, 2010, at 9:02 PM, Antoine Missout wrote: > Hi, > > On 10.6.3, doing a diff between > /usr/include/mach/message.h > and > /System/Library/Frameworks/Kernel.framework/Headers/mach/message.h > you'll notice "uint32_t pad_end;" is missing from mach_msg_port_descriptor_t in /usr/include/mach/message.h:238 > > Which leads to MIG_TYPE_ERROR (-300) when passing that structure between mig generated code compiled in userspace vs kernelspace (as the structs differ in size). > > Our fix was to add it back to the userland header, and everything started working. > > Just FYI. > - Antoine > > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Why kernel_task consumes so high CPU usage on MacBook AIR?
by Michael Crawford 18 Sep '10

18 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=xWMF4wftupdTIqK3EHAieRh8XxNrdMzREfImQbvx388=; b=TUM8TukR83KlLSZx+dHN63gnDxQRDoZOVIlv7aIILs3s5+8Y7v3BTvjhDHOF0b1/oK 76/tVGHKgOLMSsCT1FqPPCYkyhB+lLp9OgI5SREGedTkcUyLmGS0y4whZRG/DDX5XUH4 HS8NPUcEv8+cVyZhcPydQJxVukQd0j3Pg4N6I= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=NdLBli3QyiCaR9Mx6O0PRdCjXRrVISVSpeN00aq2CKZ7po0t3GKiCm1HHGcMoYHrtx vkEdCh7i2f37bLwfZ0HhNOSQ4FuYS+rT0H37C/K3ZZfZFJHZX7QyBJ6cAlUghqg3livC SbxI9ZVNWhYwlS5zCdwCDAK/lJuDRWc7vwHiU= The problem is that the MacBook Air gets too hot. I've never used one - do they have cooling fans? My MacBook Pro can get quite hot, but it has a cooling fan beneath each of the two speaker grills. If the MacBook Air requires passive cooling, the only alternative would be to throttle the CPU, which indirectly makes kernel_task appear to take a lot of time. An alternative might be to make your code more efficient, so that it can get the job done without heating the CPU up as much. That may not be possible, but work with a profiler may yield some insight. Besides Apple's CHUD tools that come with Xcode, I believe Intel's VTune Performance Analyzer may yield insight that Apple's tools won't. I used it once, and found it to be the best thing since sliced bread. If you can isolate some performance-critical code in your app, it might help to rewrite it in assembly code. In general the idea is to get your work done in fewer work cycles, so the CPU has more idle cycles during which it can lower its own supply voltage and cool down a little bit before taking up the next bit of payload work. Mike -- Michael David Crawford mdcrawford at gmail dot com GoingWare's Bag of Programming Tricks http://www.goingware.com/tips/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Why kernel_task consumes so high CPU usage on MacBook AIR?
by David Wu 18 Sep '10

18 Sep '10

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Re: Why kernel_task consumes so high CPU usage on MacBook AIR?
by Craig Newell 17 Sep '10

17 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi There, On Sep 17, 2010, at 16:46 , dgatwood(a)apple.com wrote: > On Fri, September 17, 2010, David Wu wrote: > >> I'm a developer working on a multi-media application on Mac OS X. Our >> application is designed to run on all Mac PC/laptop including Mac Mini, >> iMac, MacBook, MacBook Pro, MacBook Air. >> Now we have a problem on testing our application on MacBook Air. When the >> application runs about 20-30 minutes, the idle CPU usage decreases to 0%. >> When I open the Active Monitor, I find the kernel_task consumes very high >> CPU usage, even higher than 100%. This causes the CPU resources for our >> application not enough to handle the multi-media tasks. My observations (I have not looked for the source code) of this behavior on my 2nd generation MacBook Air 1.8 GHz, is that is how the Darwin kernel accounts for the thermal throttling of the CPU. It is directly related to how much activity is occurring and what the room temperature is. I have even seen it occur when the machine is almost idle and the ambient room temperature is like 36 deg C but mostly it occurs for me if the ambient room temperature is greater than about 22 deg C or I am using the MacBook Air directly on my lap or on a soft surface such as my bed. It is very annoying when in countries such as South Korea where air conditioning is set at 26 deg C... The joys of Intel CPU's, CraigN --- Craig Newell <craign(a)ieee.org> _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Why kernel_task consumes so high CPU usage on MacBook AIR?
by Jonas Maebe 17 Sep '10

17 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 17 Sep 2010, at 22:46, dgatwood(a)apple.com wrote: > My advice would be to take advantage of the performance profiling tools in > Instruments to find out which system calls your application is spending a > lot of time doing, then find ways to reduce the number of times you call > them. For example, read data from disk in larger chunks. Reuse large > memory allocations instead of releasing them and re-allocating them. And > so on. It seems that in this case it's allegedly an overheating problem with the MacBook Air. In reaction to that, the kernel apparently reserves fake cpu time to let the system cool down (and since it has a higher priority than everything else, this will stop cpu-hogging/heating tasks). There's some background info at http://tech.superhappykittymeow.com/?p=258 (although I would strongly recommend *against* following the advice in that article, since as a result you may risk overheating your system). Some people have reportedly had success in alleviating the issue with "undervolting" their system via a third party utility called CoolBook (http://reviews.cnet.com/8301-13727_7-10330365-263.html) which is presumably the "additional software" David Wu was referring to in his original message. To David: it helps if you link to whatever you find on the Internet so that other people don't have to perform the same searches as you did to figure out what you are talking about. In the end, it appears to be a hardware design problem of the MacBook Air (and/or usage for which the MacBook Air is not designed, depending on your point of view), and there's nothing that your software can do about that. Jonas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Why kernel_task consumes so high CPU usage on MacBook AIR?
by dgatwood＠apple.com 17 Sep '10

17 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Importance: Normal User-agent: SquirrelMail/1.4.15 On Fri, September 17, 2010, David Wu wrote: > I'm a developer working on a multi-media application on Mac OS X. Our > application is designed to run on all Mac PC/laptop including Mac Mini, > iMac, MacBook, MacBook Pro, MacBook Air. > Now we have a problem on testing our application on MacBook Air. When the > application runs about 20-30 minutes, the idle CPU usage decreases to 0%. > When I open the Active Monitor, I find the kernel_task consumes very high > CPU usage, even higher than 100%. This causes the CPU resources for our > application not enough to handle the multi-media tasks. The kernel task is not a real task. It represents the kernel, which is the core of the operating system. The bulk of what it does occurs at the direct request of an application. Every time you allocate a large block of memory, open or close a file, read or write a file, pull data over the network, create a new process or thread, etc., your application performs a system call. These calls cause the kernel to do work for your application. Much of that work is billed to the kernel task, but it really is being done by your application, albeit indirectly. My advice would be to take advantage of the performance profiling tools in Instruments to find out which system calls your application is spending a lot of time doing, then find ways to reduce the number of times you call them. For example, read data from disk in larger chunks. Reuse large memory allocations instead of releasing them and re-allocating them. And so on. Start by reading these two docs: http://developer.apple.com/library/mac/#documentation/Performance/Conceptua… http://developer.apple.com/library/mac/#documentation/DeveloperTools/Concep… and go from there. David _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Why kernel_task consumes so high CPU usage on MacBook AIR?
by David Wu 17 Sep '10

17 Sep '10

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Re: Building the 10.6.4 Kernel
by Alexander von Below 13 Sep '10

13 Sep '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Am 14.09.2010 um 00:16 schrieb Terry Lambert: > No, it's just a missing header file. > > > You really want to use gcc-4.2. The set of links I posted the other day contain the necessary build tools which know how to build the kernel with the right compiler. Download them, use them. > > -- Terry Yes, yes. And yes. It is only a mising header file. The compiler always was gcc-4.2 The links you posted the other day did help ;) Thanks a lot Alex _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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