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Date: Mon, 17 Sep 2007 11:13:05 -0700 From: Rick Jones <rick.jones2@...com> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: Re: why does tcp_v[46]_conn_request not inc MIB stats David Miller wrote: > From: Rick Jones <rick.jones2@...com> > Date: Mon, 10 Sep 2007 11:42:18 -0700 > > >>I've been digging around to see about inducing /proc/net/tcp to show >>some "interesting" things for listen sockets (eg backlog depth, its max, >>and dropped connection requests). While there I've noticed that both >>tcp_v[46]_syn_recv_sock and tcp_v[46]conn_request both check that the >>listen queue is full, but only tcp_v[46]_syn_recv_sock increments some >>mib stats for dropped connection requests. > > > They are checking two different things. > > tcp_v{4,6}_conn_request is checking whether we are hitting the limit > for allowing the initial SYN and creating a new embryonic mini-socket. > Exceeding that is not a listen overflow. I'll risk some toe chewing and ask - is the embryonic limit set based on what one sets in the listen() call and/or system configs? Seems that _some_ sort of stat should be incremented, even if it isn't the listen queue overflow one? rick jones > tcp_v{4,6}_syn_recv_sock() is processing the end of the 3-way > handshake and wants to create a full established state socket to queue > into the listening parent. This is checking the listening socket > queue limits, and indeed is a listen queue overflow if exceeded. - 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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