Date: Tue, 24 Sep 2002 15:33:28 -0400 From: "kfl" <kfl@xiphos.ca> To: "freebsd - net" <freebsd-net@FreeBSD.org>, "Cheng Jin" <chengjin@cs.caltech.edu> Subject: RE: TCP receiving buffer Message-ID: <JCEDLMKGMLLELHAJNIHJGEDLDHAA.kfl@xiphos.ca> In-Reply-To: <Pine.LNX.4.33L0.0209231614040.19551-100000@fast2.cs.caltech.edu>
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Hi, If you want to set it more than 512KB you need to grow maxsockbuf so: #sysctl -w kern.ipc.maxsockbuf=2147483648 The waste factor is used (see /sys/kern/uipc_socket2.c) to make the socket buffer specifed a multiple of 8 (basically your buffers becomes a multiple of 32bits) for efficient usilisation of memory. good luck. Karim Fodil-Lemelin. Xiphos Technologies. -----Original Message----- From: owner-freebsd-net@FreeBSD.ORG [mailto:owner-freebsd-net@FreeBSD.ORG]On Behalf Of Cheng Jin Sent: Monday, September 23, 2002 7:23 PM To: freebsd-net@freebsd.org Subject: TCP receiving buffer Hi all, I am having a hard time setting TCP receiving buffer space to be large than 512K using setsockopt under FreeBSD 4.6.2-RELEASE #0. I have tried playing with various sysctl variables, but I can't seem to break the 512K barrier. I looked at my kernel config file and didn't really find any hard limit either. here are the systcl vars that I have tried. nmbclusters is small, but I should still be able to get about 12 MB of clusters. Any idea on what sockbuf_waste_factor is?? It was 8 by default. Do I have to reduce the number of sockets for this to work? kern.ipc.maxsockbuf: 4094305 kern.ipc.sockbuf_waste_factor: 4 kern.ipc.somaxconn: 512 kern.ipc.nmbclusters: 6656 kern.ipc.nmbufs: 26624 kern.ipc.maxsockets: 12328 net.inet.tcp.sendspace: 32768 net.inet.tcp.recvspace: 4094305 Please cc me a copy when you reply. Thank you very much, Cheng To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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