I don't know how I could have missed your first reply. I've been looking for a reply for sometime -mea culpa.
On Sunday 17 April 2005 06:21 pm, Tom wrote: > njcross wrote: > > Now the bittorrent thing has subsided I thought I'd ask again. > > > > At present I'm using kernel '2.6.8.1-12.2mdk' but because I'm > > experiencing high latency,and especially xruns from Jack, was thinking of > > installing 'kernel-multimedia-2.6.10-3.mm.13mdk'. > > <snip> > > > Should I install 'kernel-multimedia-2.6.10-3.mm.13mdk' or > > kernel-2.6.11.6mdk? Will the new kernel include all the latency patches > > up to now or are kernel updates selective? If so is > > 'kernel-multimedia-2.6.10-3.mm.13mdk' the latest 'mm' available and will > > it's latency be better than 'kernel-2.6.11.6mdk'. Is there no multimedia > > '2.6.11.6mdk' yet? > > > > Any help would be most appreciated. > > I believe I spoke to this request before. If so you'll need to > refer in large part to my previous advice to install > kernel-source-2.6-2.6.11-6mdk and compile a custom low latency > version. > > Sometime back (years?) it was a contest and an argument on LKML, > low latency vs. preempt. Both involved many of the same > ingredients, preempt won out. It's not the default because it can > cause myriads of clueless user feedback on marginal hardware. That > said, I always recompile for K7 (ie, cpu specific), preempt, and low > overhead 1+gig ram addressing (K7, preempt, 4gb). Addressing ram > over 896mb introduces overhead (latency), but limiting to 4 gig is > only first layer, an a fairly negligible added burden. > > If you install kernel-source-2.6-2.6.11-6mdk, preempt is not > turned on. The line in .config to enable it is; > > CONFIG_PREEMPT=y > > When you find that line it will be commented out and end 'is not > set'. Assuming you've already edited Makefile too. You should > edit .config, 'cp' it out of the way, before starting with 'make > mrproper'. Then move it back to .config before runnin 'make > oldconfig' (make, make modules_install, make install). > > If all the above seems like Greek, then I believe (but not > sure) that the -mm (multimedia) kernels are also preempt enabled. > Latest (as of today) is kernel-multimedia-2.6.10-3.mm.28mdk.i586 > One'a the problems there is they are only opt'd for i586 (last time > I looked), and would be a joke on a ready made like a Dell, Compaq, > Gateway, etc. > > Which begs the question: If you seem articulate enough to > discern latency obstacles, why don't you just install the latest mm > kernel and see if if satisfies your requirements? You can see the > kernel features by running 'modinfo <module>' on any loaded module, > an look for a line somethin like this > > vermagic: 2.6.11-6mdkK7E4G preempt K7 gcc-3.4 > > > 'Course any an all the above doesn't mean sh!+ to a tree if > you don't know your hardware, an haven't already pushed the > cpu/cache/ram to near reasonable limits. Particularly the ram > timings, latency, an banking. An then thoro'ly tested with somethin > like mprime's torture test, or cpuburn. > > You can't compile a donkey into a thoroughbred
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