Date: Tue, 24 Aug 1999 11:42:05 +0700 (JAVT) From: kadal <kadal@elka.ee.itb.ac.id> To: Wayne Cuddy <wayne@crb-web.com> Cc: FreeBSD Hackers List <freebsd-hackers@FreeBSD.ORG> Subject: Re: network performance vs. linux on small transfers Message-ID: <Pine.BSF.3.96.990824113533.28579A-100000@elka.ee.itb.ac.id>
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On Tue, 24 Aug 1999, Wayne Cuddy wrote: > Date: Tue, 24 Aug 1999 00:38:21 -0400 (EDT) > From: Wayne Cuddy <wayne@crb-web.com> > To: FreeBSD Hackers List <freebsd-hackers@FreeBSD.ORG> > Subject: network performance vs. linux on small transfers > > 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. do you really have to deliver the messages sequentially ? SMTP conversation is rather slow, especially for small messages. you may want to try to deliver them simultaneously, by creating multiple SMTP conversations. you may also try other MTA such as qmail, postfix, etc. > I REALLY want to use FreeBSD over Linux on this one and need some major help > to get the performance out of FreeBSD. how about profiling your program / system ? try to find where it spends most time. it could be forking, disk I/O, SMTP conversation, etc. I strongly suspect that it's SMTP conversation, but can't really sure before you mesure it. -k- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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