Date: Thu, 22 Jul 1999 21:17:39 -0700 From: grady@xcf.berkeley.edu (Steven Grady) To: freebsd-smp@freebsd.org Subject: slow network reading with SMP Message-ID: <19990723044445.2C90A14FAE@hub.freebsd.org>
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We've got a SuperMicro P6DGU system (other specs: 2 450 MHz
Pentium IIIs, 256M mem, 18G SCSI, 25G UDMA) running 3.2-RELEASE.
The network card is a NetGear FA310TX Rev D1 (pn driver).
With an SMP kernel, TCP-based file transfers to the machine are very
slow (i.e. 50k/sec over a 100Mbit ethernet). Transfers from the
machine are fine -- a couple megs per second. After spending a lot of
time trying different things (swapping network cards, changing between
a switch and a hub, transferring to Windows vs. another BSD machine,
transferring via Samba vs. FTP), the one thing that made a difference
was to replace the kernel with a non-SMP version. With the non-SMP
kernel, writes went up to 6 M/sec (depending on the protocol).
The only difference between the kernels was the deletion of the following
lines:
options SMP
options APIC_IO
Why is this happening? And more importantly, what can we do to use
both processors while still keeping full network speed? (Others in the
company have mentioned Linux -- I'd like to avoid that.)
Steven
grady@xcf.berkeley.edu
"When will I learn? The answers to life's problems aren't at the
bottom of a bottle. They're on TV!"
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