From owner-freebsd-hackers Mon Aug 23 21:19:25 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from implode.root.com (root.com [209.102.106.178]) by hub.freebsd.org (Postfix) with ESMTP id E9B91158C5 for ; Mon, 23 Aug 1999 21:19:20 -0700 (PDT) (envelope-from dg@implode.root.com) Received: from implode.root.com (localhost [127.0.0.1]) by implode.root.com (8.8.8/8.8.5) with ESMTP id VAA13153; Mon, 23 Aug 1999 21:17:06 -0700 (PDT) Message-Id: <199908240417.VAA13153@implode.root.com> To: wayne@crb-web.com Cc: FreeBSD Hackers List Subject: Re: network performance vs. linux on small transfers In-reply-to: Your message of "Tue, 24 Aug 1999 00:38:21 EDT." From: David Greenman Reply-To: dg@root.com Date: Mon, 23 Aug 1999 21:17:06 -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >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