March 2010 - Darwin-kernel - lists.apple.com

Thread Performance Tuning
by babazaroni＠gmail.com 07 Mar '10

07 Mar '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:date:message-id:subject :from:to:content-type; bh=u+G+ueebNj5pYsAZeaB+OKGSAr07i+zOePRCuwxbRSM=; b=D319ReMLLtbhRJXDqiI6UcUbOhfLa5CdEZDXEENoFqlqpC9Xd2//Cf8IbICdGcrOHn h+UscyW8dtaQ+aZZ5kRjxl+8AKLmKqJMF5oVPIAjgP5lHcsVyPMrfJHNx/K+GH9PBtsz qKphSng+71b3KwDIy1U2qJAAEOB73dPvxbclw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=q5AkEtPdDCB8c/3IaAVff5F08iGmatT5+GIcIbRI1tWuq4CRX8Xw3LpnOJr628Vdq+ /8B2MLMLWR2fmCUTZiQC5Uxh4Eet9wjbA1lR9bBz5owecsLp01XwdjdzoUFOkcXILa8X /TWTJmuM5WYMektUWRiVnBjO0HiQw/UV4XPg0= Hello, I'm starting a user-level thread with posix_threads at the highest SCHED_FIFO priority, on a Core 2 Duo 2ghz Mackbook running 10.5. This thread receives audio over udp from a core audio server in another process, does some processing, then sends it back to the core audio server to be played. I can increase the workload of this thread to find out where distortion of the audio begins. This happens when the work load is set to 1200 and Activity Monitor shows 55% cpu usage. (A single work load is crudely written deinterleaving of a 64 sample 8 channel audio frame). Now the interesting part is if I start FireFox, play a youtube video, then exit, I can increase the work load to 2500 and 95% cpu usage before distortion happens. My uneducated guess was the thread is being forced to another core, but I want to hear why you guys think, and how can I get this performance all the time. I've looked into the Thread Affinity API, but the doc seems to say this works only on systems with multiple-L2 caches, one for each cpu and I don't think a Core 2 duo qualifies. I could start a true kernel thread if that will give me more control of this, but would rather leave in user land for now. Also interested in any tools that will shed light on what's going on. Thanks _______________________________________________ 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

1 0

Re: KAUTH_PROCESS_CANSIGNAL unimplemented
by Quinn 07 Mar '10

07 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com The KAUTH_PROCESS_CANSIGNAL action of the Kauth subsystem is unimplemented in all public versions of OS X. (At time of writing, that's through 10.6.) The only mention of this is within the kernel source. TN2127 gives a pretty strong hint about this. <http://developer.apple.com/mac/library/technotes/tn2005/tn2127.html> Thanks for taking the time to file this. Share and Enjoy -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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.… At 23:11 -1000 5/3/10, Dave Keck wrote: IMPORTANT: This action is not implemented in Mac OS X 10.4 Tiger (r. 3931697). Admittedly, I could see how you could read this as "wasn't implemented in 10.4 but is implemented in future systems". I'll leave <rdar://problem/3931697> to track the issue with the kernel and I'll treat <rdar://problem/7724502> as a bug against the technote to clarify the text quoted above. This email sent to site_archiver(a)lists.apple.com

1 0

Ethernet Bridging
by Thomas Reifferscheid 06 Mar '10

06 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.23 (Windows/20090812) I was trying to enable ethernet bridging for xnu-1228.15.4, like putting "option BRIDGE" into bsd/conf/MASTER, like given here: http://www.opensource.apple.com/source/xnu/xnu-1228.15.4/bsd/net/bridge.c Kernel compiles and boots up fine, but when trying to enable bridging, I get: base-3.2# sysctl -w net.link.ether.bridge.enable=1 net: class is not implemented I need layer 2 bridging but I dont need vlans, bonding, link aggregation, routing nor network adress translation. Any help here? Kind regards Thomas _______________________________________________ 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

1 0

KAUTH_PROCESS_CANSIGNAL unimplemented
by Dave Keck 06 Mar '10

06 Mar '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:from:date:message-id :subject:to:content-type; bh=T06wxMLs+km5DcwcqKsrB8tsGr4YFK5YiExC24Omy5A=; b=XexzxwhBE0eshryQQAbIrrQM50YkJN4bVWTxs34kxYk3I0RPxaNAct/Jtq+G08l69u Yg/pInqKKI+nEYzlWBBVDManr5dqAecepPl6O01dnYUE40nFxmo2SkTXWKyk08RL56AE EP51b/KPXgmE3FTtaAzjOD5ynQLS07w7zQ6Lc= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:from:date:message-id:subject:to:content-type; b=IURss1EomdUW/Z7nMnZnU3tYc+IwZizPAAq9/zT0KrwFRD+I6+Kndu6/qe5f6PX/1i 1Axq+KXl13ZObqngEhkqXTdt7xYcEj/zfn1gZRE5QxRcDEB80Jh+l9ZmrUGU/cL2nvm/ 0JvXVKx8t+SBbGpMpkkJGVq0UG+sC75M5VGjk= To save others the time I spent learning the hard way: The KAUTH_PROCESS_CANSIGNAL action of the Kauth subsystem is unimplemented in all public versions of OS X. (At time of writing, that's through 10.6.) The only mention of this is within the kernel source. Bug #7724502 _______________________________________________ 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

1 0

Re: Any NKE experts?
by Michael Crawford 05 Mar '10

05 Mar '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:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=g9lsFEcBLvNOhqgOr8drM/qABMMQXmtvtFD1qDx27hI=; b=GigNbEbCQkKF8JuedxpxiNVOUxdmam1g4/gBUnQsspVrQfnI5ZSrd7i7HCeV7HFF4c Go2evejiYm8zpECb8W6Kwo+wvDPWDLHSLL4koe+QYEC1CRT5zYiNRCTiiFgFSoWKYgpe lBEPW+28J7FCm0vg6R/gExLrfNA8ynr4jTiE4= 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; b=HeunYzwzwct/7LR1kwLve7zldsm4WPJplZ8B2ggNcsaHLt9qfq6d9zMrlvSayhCc1T wg5+PvRGH4TLsrQzmcepFZm8uFIIfwU0SLFeYzQDXP1rIn8nA45Zd7T+/+waW50cZpXy h3CEEoJiMxmSEGQnbmj8qGkYYYp7yBBm4cQec= Martin, On Thu, Mar 4, 2010 at 1:59 PM, Martin Hardman <martin.hardman(a)mobidia.com> wrote: > My company need to write an NKE in order to port our product to OS X, > however we have no previous Mac development experience. ... > So we're looking for somebody with proven expertise in developing NKEs who > may be interested in some paid consultancy work on a per-need basis. ... > We're based in Vancouver, Canada. If there is somebody nearby in the Pacific > Northwest that would be ideal as it means face to face meetings are > possible. But this isn't essential as reviews/consultation could be > performed via email/phone conference. Atimi Software is a consulting firm in Vancouver's Gastown that focusses primarily on the Macintosh. They work on other platforms as well, but the majority of their jobs are on the Mac. They do quite a lot of Mac kernel and device driver work. http://www.atimi.com/ (604) 684-1319 Steve Gully is the President: sgully(a)atimi.com Scott Michaels is the Vice President of Client Services. You should probably speak to him first, but I don't have his email handy. Tell them Mike Crawford sent you. I used to work there. The folks at Atimi are good people, and they do good work. You won't go wrong with Atimi. Regards, 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

1 0

Re: Possible bug with nanosleep()?
by Chris Wilson 04 Mar '10

04 Mar '10

site_archiver(a)lists.apple.com Delivered-To: Darwin-kernel(a)lists.apple.com User-agent: Alpine 1.00 (DEB 882 2007-12-20) Hi Terry, On Tue, 2 Mar 2010, Terry Lambert wrote: Cheers, Chris. -- _ ___ __ _ / __/ / ,__(_)_ | Chris Wilson <0000 at qwirx.com> - Cambs UK | / (_/ ,\/ _/ /_ \ | Security/C/C++/Java/Perl/SQL/HTML Developer | \ _/_/_/_//_/___/ | We are GNU-free your mind-and your software | _______________________________________________ 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.… The comment in the Libc code about the layout isn't strictly correct. Specifically, the ADD_MACH_TIMESPEC() and SUB_MACH_TIMESPEC() are macros, and the marcros only really care about having a corresponding field name for tv_nsec and tv_usec in the structures, so the difference in element size in the structure isn't going to matter, at least until we hit Y2038. Unfortunately I think it does matter, as I suspect that the resulting conversion from signed to unsigned and back is the cause of a wrong value being returned in the remaining time structure. Any ideas why I'm seeing (1<<32)-1 in tr.tv_sec after the call, when the call finishes late? This is the actual problem that I'm having. The base problem causing the issue is the signal handler taking a very long time to run in the test code. I have been able to reproduce the problem with an empty signal handler, provided that the timing of the signal arrival is just right (probably as the SEMWAIT_SIGNAL is just about to finish). Meanwhile, you should file a bug, and include this conversation as part of your description. The component it needs to be filed against is Libc. Thanks for your advice and encouragement. I have filed the report as bug number 7718487. This email sent to site_archiver(a)lists.apple.com

1 0

Any NKE experts?
by Martin Hardman 04 Mar '10

04 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: Acq75gPAR7PiyAoGSVyAn3XZuqdL5w== Thread-topic: Any NKE experts? _______________________________________________ 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

1 0

Re: PackageMaker 3.0.4 and Installing Kexts
by Kevin Brock 04 Mar '10

04 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Mar 4, 2010, at 8:04 AM, Jonathan Lott wrote: > Ok, well then I might as well ignore package maker all together and just call the shell script directly. Bummer. I've found that doing the actual build of the package from the PackageMaker GUI doesn't usually end well for packages that have special permissions needs. We install a package that has an app, a couple of daemons and several KEXTs, with different versions of some pieces for 10.5 and 10.6. I use PM to create the package project, and then build from the command line. I also have to do pre- and post-processing of the PM generated files and scripts to meet some of our needs. In general PM is a convenient way to generate your base package and requirements, but isn't really adequate for doing things with automated builds or special install requirements. In addition to permissions there are known issues with updating bundle versions in the package files. I haven't looked much at third party packaging tools, but I'm doing enough extra processing with my own scripts at this point that finding a tool that can handle all that is looking more attractive every day :-) Kevin _______________________________________________ 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

1 0

Re: PackageMaker 3.0.4 and Installing Kexts
by Jonathan Lott 04 Mar '10

04 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thanks On Mar 4, 2010, at 9:05 AM, Alexander Klyuev wrote: Hi there, I never rely on PM "set permissions" feature. Best, Alexander The System extension was installed improperly and cannot be used. Please try ireinstalling it, Can someone tell me what to do. I did see a radar about this http://openradar.appspot.com/7253630 , but I need some answers as to how to work around this issue. Is packagemaker just not up to it? Thanks _______________________________________________ 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/klax%40musiclab.com This email sent to klax(a)musiclab.com _______________________________________________ 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.… Ok, well then I might as well ignore package maker all together and just call the shell script directly. Bummer. To properly install KEXT just install it to any temporary location, then using postinstall/postupgrade script just fix KEXT files permissions and ownership and them move entire KEXT bundle to /S/L/E folder using "mv" command. That will always work correctly. -----Original Message----- From: darwin-kernel-bounces+klax=musiclab.com(a)lists.apple.com [mailto:darwin-kernel-bounces+klax=musiclab.com@lists.apple.com] On Behalf Of Jonathan Lott Sent: March 4, 2010 9:22 AM To: darwin-kernel(a)lists.apple.com Subject: PackageMaker 3.0.4 and Installing Kexts For some reason when I create a package to install a kext, when testing it out in the command line I get the following message: I have made sure that the permissions were set properly in the packagemaker doc, but it seems that when it is installed, these priveleges aren't being set during the install. This email sent to site_archiver(a)lists.apple.com

1 0

RE: PackageMaker 3.0.4 and Installing Kexts
by Alexander Klyuev 04 Mar '10

04 Mar '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: Acq7pirFlviMY3xdRE2MsrQkv8UZGQABfkeA Hi there, I never rely on PM "set permissions" feature. To properly install KEXT just install it to any temporary location, then using postinstall/postupgrade script just fix KEXT files permissions and ownership and them move entire KEXT bundle to /S/L/E folder using "mv" command. That will always work correctly. Best, Alexander -----Original Message----- From: darwin-kernel-bounces+klax=musiclab.com(a)lists.apple.com [mailto:darwin-kernel-bounces+klax=musiclab.com@lists.apple.com] On Behalf Of Jonathan Lott Sent: March 4, 2010 9:22 AM To: darwin-kernel(a)lists.apple.com Subject: PackageMaker 3.0.4 and Installing Kexts For some reason when I create a package to install a kext, when testing it out in the command line I get the following message: The System extension was installed improperly and cannot be used. Please try ireinstalling it, I have made sure that the permissions were set properly in the packagemaker doc, but it seems that when it is installed, these priveleges aren't being set during the install. Can someone tell me what to do. I did see a radar about this http://openradar.appspot.com/7253630 , but I need some answers as to how to work around this issue. Is packagemaker just not up to it? Thanks _______________________________________________ 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/klax%40musiclab.com This email sent to klax(a)musiclab.com _______________________________________________ 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

1 0