Date: Mon, 3 Jun 2002 09:58:25 -0700 From: clark shishido <clark@ruminary.org> To: Nguyen-Tuong Long Le <le@cs.unc.edu> Cc: freebsd-net@freebsd.org Subject: Re: Problem with SYN cache in FreeBSD 4.5 Message-ID: <20020603095825.A47070@ruminary.org> In-Reply-To: <Pine.GSO.4.10.10206030156290.20082-100000@capefear.cs.unc.edu>; from le@cs.unc.edu on Mon, Jun 03, 2002 at 01:59:13AM -0400 References: <Pine.GSO.4.10.10206030156290.20082-100000@capefear.cs.unc.edu>
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On Mon, Jun 03, 2002 at 01:59:13AM -0400, Nguyen-Tuong Long Le wrote: > Hi all, > > Our group has a proprietary web server that can handle 10000 requests/s > under FreeBSD 4.3 release. We recently upgraded our system to 4.5 and got > very poor performance. While the web server runs, I see lots of messages > similar to the following on the console > "Limiting open port RST response from 1068 to 200 packets per second". > > The problem seems to be related to the syncache implementation > that drops incoming SYN segments. 4.5-RELEASE included a new feature, syncookies try turning it off: net.inet.tcp.syncookies: 0 you might also need to patch the kernel: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02%3A20.syncache.asc --clark To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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