| === JanC is now known as Guest5754 | ||
| === JanC_ is now known as JanC | ||
| dsmythies | Additionally: If I look at linux/Documentation/workqueue.txt and do "echo workqueue:workqueue_queue_work > /sys/kernel/debug/tracing/set_event" and "cat /sys/kernel/debug/tracing/trace_pipe > out.txt" | 06:52 |
|---|---|---|
| dsmythies | with the issue, I get somwhere between 10,000 and 20,000 occurances of memcg_kmem_cache_create_func in the file. | 06:53 |
| dsmythies | without the issue, I get 21, and an overall file size about 50 times smaller, for otherwise similar conditions. | 06:54 |
| dsmythies | Using a simplified method to create the issue that I made. | 06:55 |
| === Guest8435 is now known as sts | ||
| caribou | Hello, just an FYI : makedumpfile is failing on 4.8 kernels (i.e. Yakkety). I'm on the issue and should fix it today | 09:54 |
| apw | caribou, thanks, if you have a bug for that could you tag it kernel-4.8 so we see it too | 09:56 |
| caribou | apw: sure : LP: #1626269 | 09:56 |
| ubot5` | Error: Could not gather data from Launchpad for bug #1626269 (https://launchpad.net/bugs/1626269). The error has been logged | 09:56 |
| apw | ubot you are just a waste of electrons | 09:56 |
| smb | apw, caribou I added the tag | 10:09 |
| caribou | smb: thanks! | 10:09 |
| * xnox hates EFI | 12:19 | |
| xnox | so much respins, so much to test =) | 12:19 |
| davmor2 | xnox: they'll be more yet | 12:41 |
| rtg | dsmythies, any luck on changing CONFIG_NR_CPUS to something less then 8192 ? | 12:43 |
| apw | rtg, that was not succesful, cking is debugging | 13:08 |
| rtg | dsmythies, I've been informed that http://bugs.launchpad.net/bugs/1626564 is likely the root of your kworker issue | 13:49 |
| ubot5` | Ubuntu bug 1626564 in linux (Ubuntu Yakkety) "4.8 regression: SLAB is being used instead of SLUB" [High,In progress] | 13:49 |
| dsmythies | rtg: Indeed, SLUB is a difference between 4.7-rc4 and 4.7-rc5, and not something that I had tried reverting. I have an inredibly simple way to demonstrate this issue. I'll add to the bug report. | 14:16 |
| rtg | dsmythies, I credit apw and cking for finding root cause | 14:17 |
| apw | cking, did all the heavy lifting ... | 14:18 |
| mterry | I'm experiencing system "slowdown" in yakkety -- that's a known issue? | 14:23 |
| apw | mterry, particularly in early boot yes | 14:24 |
| mterry | Ah. Maybe different then. I'm experiencing system unresponsiveness if anything is happening (like compiling, browsers using cpu) | 14:24 |
| mterry | Desktop experience gets quite bad, can't barely type | 14:25 |
| apw | rtg, perhaps we should have a dirty build with the curent fixes so we can see if things like this is the same or a new issue | 14:25 |
| JanC | mterry also mentioned seeing “crazy high occasional loads” | 14:30 |
| mterry | Yeah. Browsers and such tend to go mental in top, which helps trigger the unresponsiveness. But I don't know if they are going mental because of initial unresponsiveness problem that spirals out of control? | 14:31 |
| mterry | Yeah. Browsers and such tend to go mental in top, which helps trigger the unresponsiveness. But I don't know if they are going mental because of initial unresponsiveness problem that spirals out of control? | 14:32 |
| dannf | rtg: do you want SRU bugs opened for pull requests for yakkety at this point - if not, when does that change? | 15:11 |
| bjf | dannf, yes .. bugs, please | 15:13 |
| dannf | bjf: ack | 15:13 |
| rtg | dannf, please do | 15:15 |
| dsmythies | Confirmed: reverting SLAB /SLUB kernel configuration changes solves the over 2000 kworker threads issue. As a side effect, and as expected, it also solves rediculous load average values after boot. i.e. "load average: 430.90, 99.40, 32.78" | 15:35 |
| chalbersma | Is this Ask Ubuntu Accurate (http://askubuntu.com/questions/804111/is-no-reboot-kernel-patching-enabled-in-16-04)? Is there now live kernel patching in Ubuntu 16.04? I asked on #ubuntu and they said they didn't think so but I should check with you guys. | 15:38 |
| apw | chalbersma, the statements in there are accurate in that the facility to _do_ live kernel patching is included, there is no stream of such patches though | 15:45 |
| chalbersma | Has there been any live patches released? | 15:47 |
| apw | not to my knowledge no | 15:50 |
| * ogra_ notes that hot-patching does not necessarily mean no reboots ... if you patch changes something that lives in the initrd you most likely want to re-generate it and actually also ask for rebooting | 15:51 | |
| ogra_ | (and there are surely other cases where a hot patch will still cause reboots) | 15:51 |
| chalbersma | Thanks guys just wanted to clear that up. | 15:59 |
| apw | .b 6 | 16:04 |
| _ami_ | which driver is responsible for serial over ip in linux? | 16:30 |
| apw | that is normally called sol in the kernel side if it is coming via a bmc, though in my experience sol is handled by the device and faked to the machine as a real serial port | 16:35 |
| _ami_ | apw: ok, thanks | 17:01 |
| om26er | Hello! It seems the 4.8 Update on Yakkety have brought in some troubles. 1. My system becomes sluggish during load. 2. There is a lag in screen brightness keystrokes actually taking effect. | 18:10 |
| apw | om26er, yes indeed, the first one we know the fix, the second we are investigating | 18:34 |
| tdaitx | apw, hi there! we have some sort of mismatching headers between powerpc/ppc64el and the other archs that is causing a few packages to FTBFS on powerpc/ppc64el, I stumbled upon freevo's FTBFS and slangasek said he saw other packages failing due to a similar reason... he said you might be able to help me on that, the current bug is LP: #1619446 | 19:31 |
| ubot5` | Launchpad bug 1619446 in linux (Ubuntu) "mismatching headers between powerpc/ppc64el and other archs" [Medium,Triaged] https://launchpad.net/bugs/1619446 | 19:31 |
| tdaitx | please let me know when it is a good time to talk about that | 19:32 |
| apw | tdaitx, there should be a new linux-libc-dev hitting the archive about now ... could you confirm it is the same there and add that to the bug | 19:44 |
| tdaitx | apw, sure, I will check that, thanks for the info | 19:44 |
| rtg | dannf, I've pulled your changes. Please build yourself a test kernel to check if I've broken any arm64 config settings. I've been syncing with Xenial after modularizing everything. | 20:43 |
| dannf | rtg: sure and thx | 20:52 |
| tdaitx | apw, did you refer to version linux-libc-dev 4.8.0-15.16? it still FTBFS with that one | 22:24 |
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