Re: Gigabit Ethernet w/Jumbo Frames

On Tue, Jun 26, 2007 at 05:33:46PM -0700, george+freebsd@xxxxxxx wrote:
I'm having poor luck trying to use NFS over a gigabit ethernet using
jumbo frames. By all indications, my switch (Netgear GS608) forwards
jumbo frames with no difficulty, but my Realtek 8169-based cards seem
unreceptive to the idea, giving many watchdog timeouts and other
obscure log messages. One server is amd64 and my clients are i386,
but I think I've ruled that out as the problem because I see errors
evern with an i386 server. So I strongly suspect my network cards at
the moment. What gigabit ethernet cards do you use for reliable
performance with jumbo frames? -- George Mitchell


Are you setting any sysctl tunables? There have been recent
reports of watchdog timeout problems with xl, bge, and em devices.
I've manage to work around the timeout on bge with

net.inet.tcp.sendspace=131072
net.inet.tcp.recvspace=131072
net.inet.tcp.path_mtu_discovery=0
net.inet.udp.recvspace=65536
net.inet.raw.recvspace=16384
hw.pci.enable_msix=0
hw.pci.enable_msi=0
kern.ipc.nmbclusters=50000
kern.timecounter.hardware=ACPI-fast

--
Steve
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