[01:56] say, how come CONFIG_MEMCG_KMEM is diabled in trusty? [01:56] (i'm sure there's a good reason, but i can't recall, or never knew) === zz_nhayashi is now known as nhayashi === sz0` is now known as sz0 === sz0 is now known as sz0` === Guest60783 is now known as hiddenbacon === sz0` is now known as sz0 === sz0 is now known as sz0` === sz0` is now known as sz0 === nhayashi is now known as zz_nhayashi [10:49] moin moin [10:49] s [10:49] oops === psivaa is now known as psivaa-afk === sz0 is now known as sz0` === sz0` is now known as sz0 [14:20] apw: hey, we were wondering how come CONFIG_MEMCG_KMEM is disabled in trusty? [14:33] hallyn, you might be wondering until Tuesday if you're gonna depend on apw to answer [14:35] hallyn, frankly, I'm not sure why CONFIG_MEMCG_KMEM is not enabled. Likely an oversight 'cause no body howled ? [14:36] rtg: hm, ok, thx [14:37] rtg: mainly it's the upstream-recommended way to prevent forkbombs, [14:37] the reason they refuse to allow a 'ntasks' cgroup [14:37] hallyn, it kind of looks like something we should have enabled. how about starting a bug for it ? [14:37] rtg: will do, thanks [15:10] I've been doing some testing to see about moving to Trusty from Debian and I'm seeing odd performance characteristics. [15:10] Seems that memory throughput is considerably slower on Ubuntu than anything else I've tried, but only for allocation sizes <512K [15:11] as measured with sysbench --test=memory [15:11] rtg: filed bug 1309586 [15:11] Launchpad bug 1309586 in linux (Ubuntu) "enable CONFIG_MEMCG_KMEM" [Undecided,New] https://launchpad.net/bugs/1309586 [15:11] wedgwood, slub v.s. slab ? [15:11] hallyn, ack [15:12] rtg: I don't know what those are :( [15:12] memory allocators [15:12] is that dynamically tunable? [15:13] nope, they are configured at compile time. [15:16] rtg: whichever comes in the stock generic kernel. Is that something I can see with getconf? [15:17] wedgwood, egrep "SUB|SLAB" /boot/config-3.13.0-24-generic [15:18] # CONFIG_SLAB is not set [15:18] CONFIG_SLUB=y [15:19] The CentOS kernel I'm comparing with is SLAB. I'll check the debian one too [15:21] the debian kernel is SLAB, same as Ubuntu [15:23] so that doesn't seem to be the differentiator [15:31] *SLUB for debian, I meant [15:38] rtg: thanks :) [15:55] could any one why trusty comes with CONFIG_MEMCG_KMEM disabled? Was talking with hallyn yesterday about it and he suggested me to ask here [15:55] caglar10ur: rtg has posted a patch to change that :) [15:56] hallyn: ah nice :) [15:56] see pad.lv/1309586 [15:56] caglar10ur: i suspect it's something i should have noticed two months ago [15:56] hallyn: great, I’m a happy person now [15:57] hallyn: that’s also my fauly, I’ve been using trusty kernel for months and never mentioned that before :) [15:57] hallyn: I was changing the config and repacking it [15:58] heh