April 2010 - Darwin-dev - lists.apple.com

Re: Socket read tuning on Mac OS X
by Mo McRoberts 02 Apr '10

02 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Fri, Apr 2, 2010 at 15:18, Jakub Bednar <jakub.bednar(a)avg.com> wrote: "Give me about xxx kB of data per read, but if > that amount is not available in a specified time, give me what you have."? ioctl(fd, FIONREAD, &nbytes) in combination with a short sleep, perhaps? i.e., if nbytes is below the threshold, sleep for a short period and test again, if it's increased but still below the threshold, continue sleeping; if it's unchanged or above the threshold, read what's there dirty hack, though. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Socket read tuning on Mac OS X
by Jakub Bednar 02 Apr '10

02 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello list, I have written an application, that communicates using HTTP protocol. During testing, I found out, that with high download speed the CPU usage of my application is pretty high on some systems. Performance testing with Shark showed, that the problem is in a socket read() operation. I'm using the poll()/read()/write() mechanism specified by POSIX. On the systems were the CPU usage is normal, the read() system call regularly returns about 10kB of data per read. These systems have a default Ethernet driver (e.g. my Mac Book Pro with nvenet.kext driver) On the systems with high CPU usage, the read() system call regularly returns only about 1.4kB of data per read, leading to 10x bigger overhead ===> higher CPU usage. An example of this system is an iMac with AppleYukon2.kext driver or a Mac Book Air with Ethernet over USB. I have checked all the sysctl options and there is no difference. It seems to me, that this is a driver issue. If I put a small sleep before every read, more data are returned per read(), leading to rapid drop of CPU usage at a cost of slight drop of download speed. So I wonder, is there a way how to reconfigure a socket to tell him something like: "Give me about xxx kB of data per read, but if that amount is not available in a specified time, give me what you have."? I have tried SO_RCVLOWAT along with SO_RCVTIMEO options, but this is not the way. Poll() does not respect SO_RCVLOWAT and the socket will not give me less data but return an error when SO_RCVTIMEO timeout expires. Please, any ideas how to solve this? Thanks a lot, Jakub _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Mac OS X 10.6.3 Open Source Release
by William Siegrist 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com The Darwin Team is proud to announce the release of the open source code for Mac OS X 10.6.3 (build 10D573). http://opensource.apple.com/ Thank you, William Siegrist Darwin Team _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ld crashing on snow leopard
by Jonas Maebe 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 01 Apr 2010, at 18:52, Joel Reymont wrote: > On Apr 1, 2010, at 5:44 PM, Jonas Maebe wrote: > >> By fixing the bug in Apple Legal that causes them to hold back the release libunwind, I guess... > > What makes you think libunwind is the issue? The problem is that ld for Mac OS X 10.6 cannot be built (and hence not be debugged) without the source code to libunwind. Jonas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ld crashing on snow leopard
by Joel Reymont 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:subject:mime-version :content-type:from:in-reply-to:date:cc:content-transfer-encoding :message-id:references:to:x-mailer; bh=FUKqy9gDiN+8FeQYu4P19BLUb79JA+TbPpID5OaxMDU=; b=HXuwBU2O4j62AaYBxZkBF74nLXO1vpo73BAmZfjxJe1e4Fj219FmBdu3ytmWYMWook bjS8lbtCtmVjzeMJFJMPi37kOBCzEqewnAvGEObst6EQlN2tkr3B1MT9E/V5pPwkG3Da KgrlqcVcr9a6zUB60jX9i6oovMbwjW/7nlYwc= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; b=aB/l5U/TZXeOXoXZYYQ2BOPBa5rnbdLzdtliOVMakUXkjPD41LysTPRPW2L+tNd7s9 gHfr1/dbdoDlnQl08Ntzxdax5Kmvtd+l2HNpzTthkDhiEgONGAPEJNLv+80HUctBzM4/ UEn1e+gtoERsw8XBivM5/kOPdRlxCME8ucTlg= On Apr 1, 2010, at 5:44 PM, Jonas Maebe wrote: > By fixing the bug in Apple Legal that causes them to hold back the release libunwind, I guess... What makes you think libunwind is the issue? --- http://es.linkedin.com/in/joelreymont _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ld crashing on snow leopard
by Jonas Maebe 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 01 Apr 2010, at 13:58, Joel Reymont wrote: > How do I debug this? By fixing the bug in Apple Legal that causes them to hold back the release libunwind, I guess... Jonas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: ld crashing on snow leopard
by Joel Reymont 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:content-type:mime-version :subject:from:in-reply-to:date:content-transfer-encoding:message-id :references:to:x-mailer; bh=6JQHZH+6d7No3j7Ct8BHp1JDSJbcLTeYGVX5TDN6IIY=; b=R2RB95VAqDLSTVMC7A0gV5YH/etQ8o+2JcIrWWVctEEdU/Wqu1hTm7fwd1Yq0lRNyS ArVKw1qFjgAEQlePHnrOext+N7TEzFq8MVK6CNrAF6jeUpkQCUOlY0VrG3V/psuiFwvW tA/yOYEt4xeWzJVTBiOi8u3krnuzmPF027rKI= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=content-type:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to:x-mailer; b=JuxKE+XCjEdm3q4GpSnY9cWjHOwE8dFtULg//aZ2ClmhAIxahjWtqpTzqYKRV0rMXQ V8/bQc6L1HQ8XtMPAtGrIK80bXQaePXfZGw+cfnj7B9MQcv7UYXn7wSXWFj4xjV6U22l I6u578xS27jC2c3O1LZKdSZgdRV8d917ujKos= I forgot to add... uname -a Darwin biggie.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 ld -v @(#)PROGRAM:ld PROJECT:ld64-95.2.12 --- http://es.linkedin.com/in/joelreymont _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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ld crashing on snow leopard
by Joel Reymont 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:content-type :content-transfer-encoding:subject:date:message-id:to:mime-version :x-mailer; bh=jL2NXSGAiPL6BFbvdlXTh5+mp3poyS0eYs77A55zEAk=; b=dDsSVy5eexeg0fO+puwAuHEKTG3OHSdIoYPmF1c7N3Hp+u40Zg7nKPZWjiKY5JQ6p8 K7TLInfIUqIia5sIoA7PlX7DZup7yr4HYeEvCQjrp/r9D6XxslTg8PJ0wOSugp36Ge4L 3cCUtGqStvhFHyiH7OA9BRgMPmXjcIEWe5keo= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; b=QPFbGE+WaM1asKUqTi1UC8AuSMy4VBCdJcGxbijRJi56xrPfLmY21FJ3UznI+MV/79 /wWVZudoL/JQ2hmSapdwH0BgF8gvKNtDgUtUg/LCAASLXUEjAN493XHNwdQSM6s7V9p2 ZcJfSeZ0lTBWe6HRx9i9G73RlFrWstXogPSDQ= How do I debug this? Starting program: /usr/bin/ld -dynamic -arch i386 -macosx_version_min 10.5 -syslibroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk -weak_reference_mismatches non-weak -o /Users/joelr/Work/clients/xxx/reader/build/Debug-iphonesimulator/Issuu.app/Issuu -lcrt1.10.5.o -L/Users/joelr/Work/clients/xxx/reader/build/Debug-iphonesimulator -L/Users/joelr/Work/clients/xxx/reader/Classes -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk/usr/lib -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1/../../.. -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. -filelist /Users/joelr/Work/clients/xxx/reader/build/Issuu_Reader.build/Debug-iphonesimulator/xxx_Reader.build/Objects-normal/i386/xxx.LinkFileList -framework Foundation -framework UIKit -framework CoreGraphics -framework MessageUI -lz.1.2.3 -framework MediaPlayer -lPMAnalytics-r91 -framework SystemConfiguration -framework CoreLocation -lsqlite3 -framework QuartzCore -lstdc++ -lgcc_s.10.5 -lgcc -lSystem -F/Users/joelr/Work/clients/xxx/reader/build/Debug-iphonesimulator Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x0000000103b62fec 0x000000010009e464 in mach_o::relocatable::AnonymousAtom<x86>::AnonymousAtom () (gdb) where #0 0x000000010009e464 in mach_o::relocatable::AnonymousAtom<x86>::AnonymousAtom () #1 0x00000001000ccdd8 in mach_o::relocatable::Reader<x86>::Reader () #2 0x000000010010e915 in archive::Reader<x86>::makeObjectReaderForMember () #3 0x000000010010ec92 in archive::Reader<x86>::getJustInTimeAtomsFor () #4 0x000000010001c63e in Linker::addJustInTimeAtoms () #5 0x0000000100026aa4 in Linker::loadUndefines () #6 0x0000000100026c97 in Linker::loadAndResolve () #7 0x0000000100027579 in Linker::link () #8 0x0000000100029fdb in main () Thanks, Joel --- http://es.linkedin.com/in/joelreymont _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: code signing strategies
by Nico Schmidt 01 Apr '10

01 Apr '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thanks, Graham. That makes sense. And indeed, when i put my certificate into the system keychain and mark it as trusted it works. Cheers, Nico On 31.03.2010, at 17:19, Graham Lee wrote: > If your certificate is marked as trusted _in your login keychain_, then most of the OS doesn't believe that it's trusted. That's expected - the rest of the OS isn't you. If it's trusted by a Local or System-domain keychain, you do better. > > Cheers, > Graham. > > On 31 Mar 2010, at 16:15, Nico Schmidt wrote: > >> FWIW, >> I played around with task_for_pid and codesigning a bit and did not get it to work with my self-signed and trusted certificate. >> codesign -vvv -R="anchor trusted" returns: >> valid on disk >> satisfies its Designated Requirement >> explicit requirement satisfied >> >> If I used however an Apple-signed certificate I had lying around for iPhone development, task_for_pid worked. >> Does that make sense to anyone? > > -- > Graham Lee > http://blog.securemacprogramming.com/ > Pre-order now! - Professional Cocoa Application Security > http://www.amazon.co.uk/gp/product/0470525959?ie=UTF8&tag=thaeofer-21&linkC… _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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