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Date: Wed, 30 Mar 2011 22:52:54 -0700 (PDT) From: David Miller <davem@...emloft.net> To: hagen@...u.net Cc: netdev@...r.kernel.org, eric.dumazet@...il.com Subject: Re: [PATCH 1/2] socket: increase default maximum listen queue length From: Hagen Paul Pfeifer <hagen@...u.net> Date: Fri, 25 Mar 2011 19:31:38 +0100 > sysctl_max_syn_backlog on the other hand provides similar functionality: > provides a system wide upper limit of request sockets per listen socket. > But sysctl_max_syn_backlog provides a more accurate value by considerate > the actual memory situation of the system. 256 by default, 128 for > systems with low memory and up to 1024 for larger systems. sysctl_max_syn_backlog is not "256 by default", the calculation is: cnt = tcp_hashinfo.ehash_mask + 1; ... sysctl_max_syn_backlog = max(128, cnt / 256); And I think we should leave the SOMAXCONN define alone (it's a historic relic for userspace, and any sane server passes something like ~0 into listen()). And calculate the somaxconn sysctl at run time using a similar formula to that used by sysctl_max_syn_backlog. -- 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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