Ok, if you suggested the TCP_NODELAY option you were right. Once we set this
FreeBSD sent 25 msgs/second, Linux did 22 msgs/second and HPSUX did 15
msgs/second. (we TCP_NODELAY on all platforms)
Is the Linux Nangle algo broken/different?
Thanks for all the help.
Wayne
On Tue, 24 Aug 1999, Wayne Cuddy wrote:
> Date: Tue, 24 Aug 1999 00:38:21 -0400 (EDT)
> From: Wayne Cuddy <[EMAIL PROTECTED]>
> To: FreeBSD Hackers List <[EMAIL PROTECTED]>
> 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.
>
>
> I REALLY want to use FreeBSD over Linux on this one and need some major help
> to get the performance out of FreeBSD.
>
>
> Much thanks in advance,
>
> Wayne Cuddy
>
>
>
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