April 2008 - Darwin-kernel - lists.apple.com

Re: Changelog for Darwin Kernel 9.2.0 vs. 9.2.2
by Steffen Moser 17 Apr '08

17 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mutt/1.5.9i Hi Quinn, thank you very much for your reply! * On Tue, Apr 15, 2008 at 12:07 PM (+0100), Quinn wrote: > At 11:34 +0200 15/4/08, Steffen Moser wrote: > >The reason behind this is that we sometimes encounter strange TCP > >performance issues with out MacOS X 10.5.2 Server (running Kernel > >9.2.0) and our clients running MacOS X 10.5.2 (Kernel 9.2.0). > >Clients which are running Kernel 9.2.2 (it came with the latest > >"Apple TimeMachine update") don't seem to show the strange problem > >anymore. > > What about clients running 10.5 or 10.5.1? They were -AFAIK- not affected. It only happened with 10.5.2. > >As we spent quite some time with debugging the problem, I would > >just like to know if (and if so, what) anything has been changed > >regarding TCP between Darwin 9.2.0 and 9.2.2. > > If /only/ 10.5.2 clients are affected, this is probably a Time > Machine update change <rdar://problem/5756974>, which backs out a > change made in 10.5.2 <rdar://problem/5673601>. > > If 10.5 and 10.5.1 clients /are/ experiencing the problem, this might > be <rdar://problem/5746798>. > > AFAICT these are the only two kernel changes in the Time Machine > update. There are other changes that might affect networking (for > example, there are changes to the AirPort driver), but they are not > kernel changes per se. > > All-in-all, it seems like you should recommend that your users > install the Time Machine update. Is there a reason /not/ to do that? No, there is no reason for not doing this. All of our clients are running all of the available updates. But there is no Time Machine update for our server (Mac OS X Server 10.5.2), so the server is still running kernel 9.2.0 and not 9.2.2. We have now just put kernel 9.2.2 from one of our clients on our server which solved the TCP problem also for the server. Best regards, Steffen _______________________________________________ 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: Changelog for Darwin Kernel 9.2.0 vs. 9.2.2
by Steffen Moser 17 Apr '08

17 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mutt/1.5.9i Hi Terry, * On Tue, Apr 15, 2008 at 10:34 AM (-0700), Terry Lambert wrote: > The problem was the historical problem with congestion control. This > was described in the release notes, and specifically impacted transfer > speeds over AFP. See the release notes for more details. Thank you very much for your reply. It's always good to have a kind of confirmation after spending time for loacting a bug. In our case not only AFP, but sometimes also SSH was affected and it mostly happend when we were accessing the server via ADSL lines from home (perhaps the quite high latency and often Wireless LANs involved at the homes triggered the problem). It was also dependent on the components and operating systems that my colleagues are running on their computers at home. Some were affected, some not. Can these release notes which you mentioned accessed publically? Best regards, Steffen _______________________________________________ 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: How to retrieve process kernel time and user time?
by Terry Lambert 16 Apr '08

16 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -- Terry Hi All, u_quad_t p_uticks; /* Statclock hits in user mode. */ u_quad_t p_sticks; /* Statclock hits in system mode. */ Thanks in advance! Regards, Manish _______________________________________________ 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/tlambert%40apple.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.… Resource utilization information is kept in Mach. It is only copied over to BSD for the purposes of rusage(), and then only when the process exits. You are looking in the wrong place for the accounting information. Typically, at this point, we recommend that you do not use Mach calls, since this can change from software update to software update. Instead, popen() the "top" command, which is able to put its output in a machine-parsable form. If we change anything top relies on, we tend to notice it immediately and fix top at the same time, so this will insulate you from kernel structure andd algorithm changes (with the bonus of being portable to older versions of the OS without modifications). On Apr 15, 2008, at 11:09 PM, Manish Chaturvedi wrote: I am trying to get the Kernel time and User time of the process using following variables of the structure extern_proc but for every process I am getting a “Big ZERO” corresponding to these values, does that mean no process have spend even a millisecond in Kernel mode and User mode ? Is it the right way to get the Kernel time/CPU time and User time for a process (Except using ps )? What is the jiffy value in seconds on Mac because if I get values I will have to convert it in seconds. This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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How to retrieve process kernel time and user time?
by Manish Chaturvedi 16 Apr '08

16 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcifiGlD095he/+QRAWxy9ZJMAlxwA== _______________________________________________ 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: kernel thread join?
by Rob McKeever 16 Apr '08

16 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -Rob -- Rob McKeever, robm(a)apple.com Mass Storage Group, CPU Software Engineering Apple Computer On Apr 15, 2008, at 3:19 PM, Rob McKeever wrote: I know it's been depricated, but what about using an IOSyncer object? -Rob -- Rob McKeever, robm(a)apple.com Mass Storage Group, CPU Software Engineering Apple Computer On Apr 14, 2008, at 10:06 PM, Duane Murphy wrote: --- At Tue, 15 Apr 2008 14:43:40 +1000, Godfrey van der Linden wrote: The best IOKit aware equivalent to a condition variable is the IOCommandGate::commandSleep/commandWakeup APIs. On 2008-04-15, at 1:45 , Duane Murphy wrote: Now I need to work out how to do that. Any recommendations for a kernel condition variable? Thanks for the ideas, On 2008-04-12, at 5:08 , Duane Murphy wrote: What is the equivalent of pthread_join() for a kernel thread? ...Duane _______________________________________________ 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/gvdl%40mac.com ...Duane _______________________________________________ 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/robm%40apple.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.… It was pointed out to me off-list that the IOCommandGate::commandSleep/ commandWakeup API is the the proper and blessed alternative to using an IOSyncer. I should have dug into it a bit more before speaking. Hopefully I haven't caused myself too much embarrassment. Unfortunately, I don't recall what it is being replaced with off the top of my head, but it sounds almost exactly like what you're looking for. However the way you describe the problem the reference counting solution seems ideal. Especially as it is a data removal cleanup type of problem. I assume your problem is that you need to execute some code to do the data cleanup? Is that correct? Can you describe the action you want to take on completion? The fundamental problem is that the case that I am working with, the system is either going to sleep, shutting down, or in general going off- line. I can't return from the call that says "you're going off-line" until the other thread has completed and exited. The final stage of the exit of the other thread, records the information about why the thread exited so that it can be brought back up again appropriately. I'm using msleep() and it seems to be doing the job just great. Conveniently all the pieces were there in place; a variable to track the completion, and a mutex lock for that variable. Enter msleep() with a reasonable timeout and a wakeup() call at the end of the thread, and viola. --- At Mon, 14 Apr 2008 11:48:06 +1000, Godfrey van der Linden wrote: There isn't really a 100% reliable way of waiting for a thread to terminate completely. However that isn't really a problem. The key is to recognise what you are really trying to do. Presumably you are trying to clean up resources that the thread may be using? In this case the correct kernel way of cleaning this up is just to reference count your resources. Then it doesn't matter exactly what order the objects get released in. There are a couple of other tricks but the OSObject reference counting will probably get you out of trouble. Thanks for the idea. Unfortunately, in this case I think I need to wait for the thread to stop. The thread is processing data. The data is going to be removed and can't be removed until the processing has been halted and the removal noted. The waiting thread has received the notice that the data is going away and should clean up. I'm going to use a condition variable to signal the end of the thread. I am using IOThreadCreate() to create a new thread. At some later point I indicate to that thread to stop. How do I detect that the thread as exited? This email sent to gvdl(a)mac.com This email sent to robm(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: kernel thread join?
by Rob McKeever 15 Apr '08

15 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.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

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Re: Changelog for Darwin Kernel 9.2.0 vs. 9.2.2
by Terry Lambert 15 Apr '08

15 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -- Terry Hi, can you please tell me if there are any public logs that show the changes and bug fixes between the Darwin Kernel 9.2.0 und 9.2.2? The reason behind this is that we sometimes encounter strange TCP performance issues with out MacOS X 10.5.2 Server (running Kernel 9.2.0) and our clients running MacOS X 10.5.2 (Kernel 9.2.0). Clients which are running Kernel 9.2.2 (it came with the latest "Apple TimeMachine update") don't seem to show the strange problem anymore. As we spent quite some time with debugging the problem, I would just like to know if (and if so, what) anything has been changed regarding TCP between Darwin 9.2.0 and 9.2.2. Thank you very much in advance! Best regards, Steffen _______________________________________________ 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 problem was the historical problem with congestion control. This was described in the release notes, and specifically impacted transfer speeds over AFP. See the release notes for more details. On Apr 15, 2008, at 2:34 AM, Steffen Moser <lists(a)steffen-moser.de> wrote: -- --- --------------------------------------------------------------------- Dipl.-Inf. Steffen Moser Department of Embedded Systems/Real-Time Systems Ulm University Albert-Einstein-Allee 11 89081 Ulm, Germany http://www.uni-ulm.de/in/esys/ _______________________________________________ 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/tlambert%40apple.com This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Changelog for Darwin Kernel 9.2.0 vs. 9.2.2
by Quinn 15 Apr '08

15 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com The reason behind this is that we sometimes encounter strange TCP performance issues with out MacOS X 10.5.2 Server (running Kernel 9.2.0) and our clients running MacOS X 10.5.2 (Kernel 9.2.0). Clients which are running Kernel 9.2.2 (it came with the latest "Apple TimeMachine update") don't seem to show the strange problem anymore. What about clients running 10.5 or 10.5.1? As we spent quite some time with debugging the problem, I would just like to know if (and if so, what) anything has been changed regarding TCP between Darwin 9.2.0 and 9.2.2. 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 11:34 +0200 15/4/08, Steffen Moser wrote: If /only/ 10.5.2 clients are affected, this is probably a Time Machine update change <rdar://problem/5756974>, which backs out a change made in 10.5.2 <rdar://problem/5673601>. If 10.5 and 10.5.1 clients /are/ experiencing the problem, this might be <rdar://problem/5746798>. AFAICT these are the only two kernel changes in the Time Machine update. There are other changes that might affect networking (for example, there are changes to the AirPort driver), but they are not kernel changes per se. All-in-all, it seems like you should recommend that your users install the Time Machine update. Is there a reason /not/ to do that? This email sent to site_archiver(a)lists.apple.com

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Re: Baudrate of Ethernet interface
by Rakesh Singhal 15 Apr '08

15 Apr '08

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Changelog for Darwin Kernel 9.2.0 vs. 9.2.2
by Steffen Moser 15 Apr '08

15 Apr '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mutt/1.5.9i Hi, can you please tell me if there are any public logs that show the changes and bug fixes between the Darwin Kernel 9.2.0 und 9.2.2? The reason behind this is that we sometimes encounter strange TCP performance issues with out MacOS X 10.5.2 Server (running Kernel 9.2.0) and our clients running MacOS X 10.5.2 (Kernel 9.2.0). Clients which are running Kernel 9.2.2 (it came with the latest "Apple TimeMachine update") don't seem to show the strange problem anymore. As we spent quite some time with debugging the problem, I would just like to know if (and if so, what) anything has been changed regarding TCP between Darwin 9.2.0 and 9.2.2. Thank you very much in advance! Best regards, Steffen -- ------------------------------------------------------------------------ Dipl.-Inf. Steffen Moser Department of Embedded Systems/Real-Time Systems Ulm University Albert-Einstein-Allee 11 89081 Ulm, Germany http://www.uni-ulm.de/in/esys/ _______________________________________________ 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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