Date: Fri, 9 Jan 2004 09:25:17 -0500 (EST) From: <silby@silby.com> To: <andre@freebsd.org> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/netinet ip_icmp.c tcp.h tcp_input.c tcp_subr.ctcp_usrreq.c tcp_var.h Message-ID: <36749.158.6.15.27.1073658317.squirrel@webmail.pair.com> In-Reply-To: <3FFEB449.1C32B5FD@freebsd.org> References: <200401081740.i08He8J9063202@repoman.freebsd.org> <3FFEAFC2.8070303@freebsd.org> <3FFEB449.1C32B5FD@freebsd.org>
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> David Xu wrote: >> >> I got following messages when I am running mysql stress test suite, >> and the test can not be completed. >> >> "too many small tcp packets from 128.0.0.1:20672, av. 91byte/packet, >> dropping connection" > > You can set net.inet.tcp.minmssoverload to a higher value than the > default of 1,000. I suggest trying with 2,000 as next step and see if > it still overloads. > > Appearently my default of 1,000 pps is fine for normal use but too low > for some edge cases. > > Could you check the MySQL source code if it has a setsockopt() setting > the TCP_NODELAY option? That would help to explain a lot. > > -- > Andre This might nerf the protection a bit, but could reduce the packet counter once for each socket write the local machine does? That should protect chatty applications, but still detect those that are just flooding data to a bulk service like ftp or smtp. Mike "Silby" Silbersack
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