Date: Mon, 23 Aug 1999 21:17:06 -0700 From: David Greenman <dg@root.com> To: wayne@crb-web.com Cc: FreeBSD Hackers List <freebsd-hackers@FreeBSD.ORG> Subject: Re: network performance vs. linux on small transfers Message-ID: <199908240417.VAA13153@implode.root.com> In-Reply-To: Your message of "Tue, 24 Aug 1999 00:38:21 EDT." <Pine.LNX.3.95.990824002132.32282A-100000@crb.crb-web.com>
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>I am involved in a messaging system at work in which we need to send/receive >large amounts of small (one line messages) SMTP messages. We are currently using Sendmail 8.9.3 >on HPUX. > >Our application sends messages down a FIFO to a daemon process that is reading from >the FIFO. This process then connects to port 25 of the destination system and >delivers the mail via SMTP. Currently the destination system is the local >system so everything is done on one machine. > >Using HPUX we typically pass 5 messages a second. This system is a dual >180Mhz K class server so this is surprisingly low performance for this system. > >When testing on FreeBSD 3.1 we also got 5 messages a second. This system is a >500Mhz P3, this is also unacceptable performance. > >When we tested with Linux (kernel 2.2.5) we passed 15 messages a second >consistently using the exact same P3 described above. > >Since the HPUX and FreeBSD numbers are so close I am wondering there is some >performance tuning that I do not know about. Do you think the number might >change if multiple hosts were used? > >The daemon that reads from the FIFO makes only one connection to the local >Sendmail to deliver multiple messages in sequence. > > >I REALLY want to use FreeBSD over Linux on this one and need some major help >to get the performance out of FreeBSD. Are you setting the TCP_NODELAY socket option on the SMTP connection? If not, then please do that and let me know if it fixes the problem or not. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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