On Thu, 2010-09-30 at 19:53 +0200, Ralf Mardorf wrote: > On Thu, 2010-09-30 at 12:58 -0400, Ronan Jouchet wrote: > > On Thu, Sep 30, 2010 at 11:45 AM, Ralf Mardorf > > <ralf.mard...@alice-dsl.net> wrote: > > > Why does Ubuntu Studio comes without PREEMPT RT, but just PREEMPT?! > > > This is my intension. > > > > > > FWIW, I'm a professional audio and video engineer and did program oldish > > > computers and I'm missing hard real-time for modern PCs. Even the > > > kernel-rt isn't able to do hard real-time, so I don't understand why > > > Ubuntu Studio does prefer a kernel without rt-patch. Today the rt-patch > > > isn't good enough and any kernel without this patch is useless for > > > multimedia production. > > > > > > So a misunderstanding ;)! > > > > Hello Ralf, > > > > You keep coming back to -rt/-realtime, but nobody ever questioned > > their greatness. I trust you when you mention -rt is the ideal > > solution in your heavy MIDI use case, and I would also *love* a > > properly maintained -rt kernel in Studio. > > > > Now, whether we want it or not, the facts are: > > - Preparing -realtime (vanilla+rtpatch) or -rt > > (vanilla+ubuntusauce+rtpatch) is a lot of work and there are no > > resources for this > > - On the contrary, -lowlatency (generic with some config tweaks) means > > performance tradeoff, _but_ could happen in a PPA (maybe even in the > > archives in Natty) because it is less of a maintenance hell > > > > You mention you have some custom built kernels, so if you feel like > > helping maintaining -realtime/-rt, by all means step in, talk to > > Alessio and make it happen. But insisting again and again on -rt and > > -realtime without considering the possibilities is only going to > > discourage him from working on the feasible options. > > > > He tries to propose sustainable options and the only echoes are > > negative, without much questioning. What are the results of your own > > tests with -lowlatency? What kind of performance drop have you met on > > one of your heavy setups? How much latency lost, on which kind of > > machine / firewire card? > > > > Ronan > > Hi Ronan :) > > I marked your email and will come back to it ASAP. At the moment the > influenza gained the upper hand. > > I guess it's not that important what issues I had when using the PREEMPT > kernel, there were issues and I didn't noticed that it was a PREEMPT, > but a PREEMPT RT kernel, when I posted something, including uname -a at > LAD or JACK mailing list. Somebody else noticed it. I might do another > test, or search the archives, but I would prefer trying to compile and > build a package for a kernel-rt again on my Ubuntu Studio and post the > package for 64-bit or ask because of trouble, if the compiling should > fail, resp. the startup when booting the kernel should fail. > > Perhaps I could try to compile a kernel-rt at the weekend. I suspect > issues for the startup regarding to X, but I'm not sure. > > To be continued ... probably this weekend ... if I don't answer until > the week after next, please remember me to compile a kernel-rt and to > post the messages I get when booting the kernel-rt from the > repositories. > > Today I don't wish to test anything. > > I've got two PCI Envy24 cards, Terratec EWX 24/96, a NVidia 7200 GS + an > onboard Radeon X1250-based graphics. The mobo is a M2A-VM HDMI and > > suse11-2:/home/spinymouse11.2 # hwinfo --cpu > 01: None 00.0: 10103 CPU > [Created at cpu.301] > Unique ID: rdCR.j8NaKXDZtZ6 > Hardware Class: cpu > Arch: X86-64 > Vendor: "AuthenticAMD" > Model: 15.107.2 "AMD Athlon(tm) X2 Dual Core Processor BE-2350" > Features: > fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,sep,mtrr,pge,mca,cmov,pat,pse36,clflush,mmx,fxsr,sse,sse2,ht,syscall,nx,mmxext,fxsr_opt,rdtscp,lm,3dnowext,3dnow,rep_good,extd_apicid,pni,cx16,lahf_lm,cmp_legacy,svm,extapic,cr8_legacy,3dnowprefetch > Clock: 1000 MHz
Oops, clock is higher ... spinymouse1...@suse11-2:~> cpu-p Password: spinymouse1...@suse11-2:~> su -c "hwinfo --cpu" Password: 01: None 00.0: 10103 CPU [Created at cpu.301] Unique ID: rdCR.j8NaKXDZtZ6 Hardware Class: cpu Arch: X86-64 Vendor: "AuthenticAMD" Model: 15.107.2 "AMD Athlon(tm) X2 Dual Core Processor BE-2350" Features: fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,sep,mtrr,pge,mca,cmov,pat,pse36,clflush,mmx,fxsr,sse,sse2,ht,syscall,nx,mmxext,fxsr_opt,rdtscp,lm,3dnowext,3dnow,rep_good,extd_apicid,pni,cx16,lahf_lm,cmp_legacy,svm,extapic,cr8_legacy,3dnowprefetch Clock: 2100 MHz [snip] Frequency scaling was ondemand, but performance. -- Ubuntu-Studio-users mailing list Ubuntu-Studio-users@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users