Date: Mon, 19 Jan 2004 15:34:52 +0900 (KST) From: CHOI Junho <cjh@kr.FreeBSD.org> To: freebsd-net@freebsd.org Cc: freebsd-performance@freebsd.org Subject: mbuf tuning Message-ID: <20040119.153452.10362034.cjh@kr.FreeBSD.org>
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Hi, What is general guidelines of mbuf cluster tunables? I usually use kern.ipc.nmbclusters="65536" in /boot/loader.conf.local. But it has limits on concurrent TCP sessions, under my /etc/sysctl.conf configuration: net.inet.tcp.sendspace=65536 net.inet.tcp.recvspace=65536 With above parameters, about 1000 connection was the maximum. Of course if I set 1/2 value for tcp buffer(32768), maximum connection is doubled. But I want more. Increasing kern.ipc.nmbclusters caused frequent kernel panic under 4.7/4.8/4.9. How can I set more nmbclusters value with 64K tcp buffers? Or is any dependency for mbufclusters value? (e.g. RAM size, kern.maxusers value or etc) p.s. RAM is 2G, Xeon 2.0G x 1 or 2 machines. -- CHOI Junho <http://www.kr.FreeBSD.org/~cjh>; KFUG <cjh at kr.FreeBSD.org> FreeBSD Project <cjh at FreeBSD.org> Web Data Bank <cjh at wdb.co.kr> Key fingerprint = 1369 7374 A45F F41A F3C0 07E3 4A01 C020 E602 60F5
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