Date: Thu, 15 Jan 2004 15:30:23 +0100 From: Andre Oppermann <andre@freebsd.org> To: CHOI Junho <cjh@kr.FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD -> Windows HTTP TCP performance Message-ID: <4006A3FF.6061AFB9@freebsd.org> References: <20040113.225411.74714267.cjh@kr.FreeBSD.org> <20040115.224407.41715339.cjh@kr.FreeBSD.org>
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CHOI Junho wrote: > > For those who interested, I made packet dump file: > > http://www.kr.freebsd.org/~cjh/misc/freebsd-net/ > > Best thing is do tcpdump at client machine but I have no admin > permission, so failed. I can't read the dump files with ethereal, it says they are corrupt. But lets go through your sysctl settings: > kern.clockrate: { hz = 2000, tick = 500, ... HZ should not be higher than 1000 or you get problems with some tcp timers. > kern.ipc.maxsockbuf: 67108864 This is way too high. Normally it is 262144 (=256k). Don't do more than 1MByte. > <118>Jan 12 13:06:21 kt-down3 thttpd[37449]: accept - Software caused connection abort > <118>Jan 12 13:21:00 kt-down3 thttpd[37449]: mmc panic - freeing 49 unreferenced maps > <118>Jan 12 13:22:49 kt-down3 thttpd[37449]: mmc panic - freeing 49 unreferenced maps > <118>Jan 12 13:31:18 kt-down3 thttpd[37449]: mmc panic - freeing 45 unreferenced maps > <118>Jan 12 13:33:12 kt-down3 thttpd[37449]: mmc panic - freeing 110 unreferenced maps This doesn't look good. You should find out why thttpd is complaining. > net.inet.tcp.sendspace: 32768 > net.inet.tcp.recvspace: 16384 It's better to have them both at 65536 (64k). > net.inet.tcp.delayed_ack: 0 It's better to have this turned on. > net.inet.tcp.slowstart_flightsize: 1 You can raise this to 4. > net.inet.tcp.msl: 1000 It's better to have this at 30000. You should change these values and try again. A new tcpdump would be helpful too. -- Andre
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