Messages in this thread | | | Date | Fri, 08 Sep 2017 22:16:48 -0700 (PDT) | Subject | Re: [PATCH] ipv4: Namespaceify tcp_max_orphans knob | From | David Miller <> |
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From: 严海双 <yanhaishuang@cmss.chinamobile.com> Date: Sat, 9 Sep 2017 13:09:57 +0800
> > >> On 2017年9月9日, at 下午12:35, Cong Wang <xiyou.wangcong@gmail.com> wrote: >> >> On Fri, Sep 8, 2017 at 6:25 PM, 严海双 <yanhaishuang@cmss.chinamobile.com> wrote: >>> >>> >>>> On 2017年9月9日, at 上午6:13, Cong Wang <xiyou.wangcong@gmail.com> wrote: >>>> >>>> On Wed, Sep 6, 2017 at 8:10 PM, Haishuang Yan >>>> <yanhaishuang@cmss.chinamobile.com> wrote: >>>>> Different namespace application might require different maximal number >>>>> of TCP sockets independently of the host. >>>> >>>> So after your patch we could have N * net->ipv4.sysctl_tcp_max_orphans >>>> in a whole system, right? This just makes OOM easier to trigger. >>>> >>> >>> From my understanding, before the patch, we had N * net->ipv4.sysctl_tcp_max_orphans, >>> and after the patch, we could have ns1.sysctl_tcp_max_orphans + ns2.sysctl_tcp_max_orphans >>> + ns3.sysctl_tcp_max_orphans, is that right? Thanks for your reviewing. >> >> Nope, by N I mean the number of containers. Before your patch, the limit >> is global, after your patch it is per container. >> > > Yeah, for example, if there is N containers, before the patch, I mean the limit is: > > N * net->ipv4.sysctl_tcp_max_orphans > > After the patch, the limit is: > > ns1. net->ipv4.sysctl_tcp_max_orphans + ns2. net->ipv4.sysctl_tcp_max_orphans + …
Not true.
Please remove "N" from your equation of the current situation.
"sysctl_tcp_max_orphans" applies to entire system, it is a global limit, comparing one limit against all orphans in the system, there is no N.
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