[08:40] <pkern> Hi. What's the timeline for 3.16.0-38.52~14.04.1 to be pushed to trusty proper?
[08:45] <henrix> pkern: that kernel is currently under testing/verification. if everything goes according to the plan, it should be out of -proposed by the end of this week
[08:46] <henrix> (we're currently on the 3rd week of the 3 weeks SRU cycle)
[08:55] <infinity> It actually just needs a security sign-off, and it could go out today.
[08:56] <infinity> jjohansen: Any chance you'll get around to kernel security signoffs today?
[11:18] <dileks_webchat> hi
[11:19] <dileks_webchat> I have a hdd in a notebook and want to deactivate hdd-scan when using a recent ubuntu live-system. do you happen to know if there is a boot-option for that?
[11:20] <dileks_webchat> I checked <http://wiki.ubuntuusers.de/Bootoptionen?redirect=no> (German)
[11:20] <dileks_webchat> cannot see a suitable boot-option
[11:23] <apw> dileks_webchat, i don't think i know what you are referring to when you say hdd-scan
[11:23] <apw> exactly what are you trying to prevent occuring ?
[11:24] <dileks_webchat> the hdd is defect and should not be considered for installation or whatever. handled as non-existent
[11:26] <dileks_webchat> hdd is full of s.m.ar.t errors
[11:29] <dileks_webchat> hardware-detection on boot-up results in a restart of the live-system. hdd cant be deactivated in bios.
[11:32] <apw> dileks_webchat, ok makes sense, i am supprised it would trigger a restart, i would expect it to just take longer to boot
[11:32] <apw> dileks_webchat, as i have used live images often to get what is still readable off broken laptop drives in the past
[11:34] <apw> dileks_webchat, it is possible something like libata.force=disable might do what you want
[11:35] <apw> you might need to limit it to the device whihc is in error if that also gets rid of your usb stick
[11:37] <dileks_webchat> how do I limit to the device - which parameter do I pass?
[11:38] <apw> dileks_webchat, never done it, it just says [ID:] in front of the disable;
[11:38] <apw>         libata.force=   [LIBATA] Force configurations.  The format is comma
[11:38] <apw>                         separated list of "[ID:]VAL" where ID is
[11:38] <apw>                         PORT[.DEVICE].  PORT and DEVICE are decimal numbers
[11:38] <apw>                         matching port, link or device.  Basically, it matches
[11:38] <apw>                         the ATA ID string printed on console by libata.  If
[11:39] <dileks_webchat> hehe, I was looking at that :-)
[11:39] <dileks_webchat> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/kernel-parameters.txt#n1745
[11:42] <dileks_webchat> apw: thanks for the quick answer!
[11:47] <dileks_webchat> bye
[11:54] <mickkelodeon> hi
[11:55] <mickkelodeon> I don't know if this is the best place for asking about low-latency/real-time kernels with ubuntu and ec2 instances...
[12:00] <apw> mickkelodeon, without knowing the question that is hard to say
[12:01] <mickkelodeon> I have more than 100 processes working in real time, and the latency is killing me 
[12:01] <mickkelodeon> I want to change the kernel for another with better performance for this purpose
[12:11] <mickkelodeon> I was taking a look to the lowlatency kernel, but when I installed it I got "Ignoring non-Xen Kernel on Xen domU host: vmlinuz-3.2.0-82-lowlatency"
[12:13] <smb> iirc that is keyed on some CONFIG_XEN ... could be the default options for lowlatency differ there
[12:14] <mickkelodeon> because the realtime kernels seem outdated
[12:22] <apw> smb, i would be supprised if we changed xen in lowlatency
[12:23] <apw> smb, unless it is somehow contra-indicated of course for the other options
[12:23] <smb> The realtime patchset was a big effort to maintain and nobody cared to fund it. I believe I remember vaguely that there was some recent decision to bring it upstream
[12:23] <smb> apw, Yeah, I am not sure where lowlatency came back then
[12:23] <apw> smb, yeah thats my memory that RT is going to die either by merging or dissappearnig
[12:25] <smb> then it also could be the way the special update-gub checks. That also has changed over time from checking kernel names to kernel options... 
[12:25] <smb> If I could remember all those dates... :/
[12:29] <smb> Hrm, the responsible package also changed name and place. Used to be grub-lecacy-ec2 (part of cloud-init source) and now might be pv-grub-menu since Trusty
[12:43] <mickkelodeon> so, smb apw what is the best way in my case?
[12:45] <pkern> henrix: Thanks!
[12:46] <smb> mickkelodeon, I am looking at update-grub-legacy-ec2 which comes via grub-legacy-ec2 in Precise. If I cannot find a nicer way, maybe fiddling with is_xen_kernel could work for you... though probably a bit of a pita if it needs doing for multiple installs/instances
[12:47] <smb> Its bascially a bash script and as I suspected it keys on the -virtual part of the kernel filename back then
[12:49] <apw> smb, ug
[12:49] <mickkelodeon> smb , but do you think this could be a substantial change in terms of performance for my case?
[12:49] <smb> Hm, maybe one could even define the shell function seperately as it checks for it to exist
[12:50] <apw> audio peoiple claim it helps latency significantly for their use case, but ymmv
[12:51] <smb> Yeah... there is a catch maybe for in P -virtual may have had more essential things build in for running under Xen than generic
[12:52] <apw> smb, ugg
[12:53] <smb> apw, Yeah... with lucid gone now we went from quite different to subtly different which is hard to remember
[12:53] <apw> smb, yeah
[12:53] <trippeh> I doubt a realtime kernel would make much difference on AWS/ec2
[12:55] <trippeh> on public clouds you often have to build your system to be tolerant to some extra latency
[12:55] <smb> with the addition of vcpu scheduling its hard to predict ... i guess
[13:06] <smb> So it might be that lowlatency improves a little by being preemptive and setting a higher HZ because it lowers a single tasks effect but still a vcpu can stall or cause latency outside the kernels control
[15:02] <jjohansen> infinity: yes
[19:45] <cyking> i've been asked to fully commit bisect the kernel. can someone help walk me through the process. thanks.
[19:45] <cyking> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1453391
[20:36] <cyking> seems that I should focus on one of these comnits http://pastebin.com/WwVjC02W but the instructions are not so clear to me.
[21:45] <cyking> trying to build kernel but debian.master and debian folders do not exist. what to do ?