lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <1289028392.2665.2418.camel@edumazet-laptop> Date: Sat, 06 Nov 2010 08:26:32 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: Ben Greear <greearb@...delatech.com> Cc: NetDev <netdev@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org> Subject: Re: OOM when adding ipv6 route: How to make available more per-cpu memory? Le vendredi 05 novembre 2010 à 17:07 -0700, Ben Greear a écrit : > We just tried creating 1000 macvlans with IPv6 addrs on a 64-bit machine > with 12GB RAM. Only around 520 interfaces properly set their IPs, and > again there are errors about of-of-memory from 'ip', but no obvious > splats in dmesg. > > 'top' shows 10G or so free. > > It will take some time to figure out what exactly is returning > the ENOMEM.... At least, nothing to do with percpu stuff ? On my 4GB machine, 16 'cpus' (but 32 possible cpus), I was able to allocate. 8192 percpu 8192 bytes structures (total : 32 * 8192 * 8192 = 2 Gbytes) setup_percpu: NR_CPUS:32 nr_cpumask_bits:32 nr_cpu_ids:32 nr_node_ids:2 PERCPU: Embedded 26 pages/cpu @ffff88007fc00000 s76032 r8192 d22272 u131072 pcpu-alloc: s76032 r8192 d22272 u131072 alloc=1*2097152 pcpu-alloc: [0] 00 02 04 06 08 10 12 14 17 19 21 23 25 27 29 31 pcpu-alloc: [1] 01 03 05 07 09 11 13 15 16 18 20 22 24 26 28 30 grep Vmalloc /proc/meminfo VmallocTotal: 34359738367 kB VmallocUsed: 2202592 kB VmallocChunk: 34356996456 kB Make sure udev / hotplug is not the problem, if you create your devices very fast. (modprobe dummy numdummies=2000) can be very slow because of that. All tasks are fighting for RTNL or sysfs mutex. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists