Date: Fri, 16 Jan 2004 00:04:01 +0900 (KST) From: CHOI Junho <cjh@kr.FreeBSD.org> To: andre@freebsd.org Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD -> Windows HTTP TCP performance Message-ID: <20040116.000401.104115832.cjh@kr.FreeBSD.org> In-Reply-To: <4006A3FF.6061AFB9@freebsd.org> References: <20040113.225411.74714267.cjh@kr.FreeBSD.org> <20040115.224407.41715339.cjh@kr.FreeBSD.org> <4006A3FF.6061AFB9@freebsd.org>
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From: Andre Oppermann <andre@freebsd.org> Subject: Re: FreeBSD -> Windows HTTP TCP performance Date: Thu, 15 Jan 2004 15:30:23 +0100 > 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. > file *.tcpdump test-fbsd.tcpdump: tcpdump capture file (little-endian) - version 2.4 (Ethernet, capture length 120) test-w2k.tcpdump: tcpdump capture file (little-endian) - version 2.4 (Ethernet, capture length 120) I can read these files with 'tcpdump -r <file>'. They are captured with 'tcpdump -w <file> -p -v -s 120 -n -l host <ip>'. > 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. OK. > > kern.ipc.maxsockbuf: 67108864 > > This is way too high. Normally it is 262144 (=256k). Don't do > more than 1MByte. OK. > > <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. This thttpd is my custom version... it is some kind of debugging(periodical garbage collection). > > net.inet.tcp.sendspace: 32768 > > net.inet.tcp.recvspace: 16384 > > It's better to have them both at 65536 (64k). OK. > > net.inet.tcp.delayed_ack: 0 > > It's better to have this turned on. Some people or webpage recommends turning off delayed_ack for Windows clients. Which is true? > > net.inet.tcp.slowstart_flightsize: 1 > > You can raise this to 4. OK. > > net.inet.tcp.msl: 1000 > > It's better to have this at 30000. OK. > You should change these values and try again. A new tcpdump would be > helpful too. Thank you! I'll try with new tuned parameters. -- 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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