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Date: Thu, 28 Mar 2013 18:38:58 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Stephen Hemminger <stephen@...workplumber.org>, Benoit Lourdelet <blourdel@...iper.net>, Serge Hallyn <serge.hallyn@...ntu.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [RFC][PATCH] iproute: Faster ip link add, set and delete On Thu, 2013-03-28 at 18:29 -0700, Eric W. Biederman wrote: > An interesting thought. I had a patch I never got around to pushing a > while back that would have had an effect. > > It is my observation that the vast majority of packet filters apply not > to the entire machine but to an individual interface. In fact you have > to work pretty hard to get tools like tcpdump to dump all of the > interfaces at once. > > So to speed things up for machines that have a lot of these things the > idea was to create per device lists for the filters that only needed to > be run on a single device. In this case it looks like we could > potentially create per device lists for of the listening sockets as well. > > In general these lists should be short so the search can also be short. > > But I am curious do you actually have a tcpdump or something similar > running on your box that is using AF_PACKET sockets? Perhaps a dhcp > client? > > I am a little surprised that your default case has anything on the lists > to trigger any work in the packet_notifier notifier. Hmm, it might be a local daemon on my lab machine which does a PACKET_ADD_MEMBERSHIP for each created interface. So my machine spend time in packet_dev_mclist(), with a quadratic behavior at rmmod. -- 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
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