Date: Tue, 18 May 2021 21:22:39 -0700 From: Julio Merino <julio@meroh.net> To: freebsd-ppc@freebsd.org Subject: Network instability with jumbo frames on a G5 Message-ID: <CADyfeQXPTcJqMxkkQveDzfjsvNQPZL0iKnM-rABgM0=30F2g4Q@mail.gmail.com>
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Hi all, I'm trying to enable jumbo frames on my PowerMac G5 but I'm running into trouble. As soon as I type "ifconfig bge0 mtu 9000", the kernel prints this: [zone: mbuf_jumbo_9k] kern.ipc.nmbjumbo9 limit reached and the ifconfig command gets stuck. This obviously shouldn't be happening on a default configuration (right?). If I then bump kern.ipc.nmbjumbo9 (to ~40k, which is a bit bigger than the default ~32k), then the ifconfig command gets unstuck and the network becomes responsive again... to some extent. But whichever connection triggers a jumbo frame gets stuck: for example, managing the machine over SSH is impossible as any command that prints a lot of output quickly will cause the connection to stall and die. I've also tried with a smaller jumbo frame (4072) and observed the same issues. This is on a machine with 10GB of RAM and this adapter: bge0: <Broadcom BCM5714 B3, ASIC rev. 0x008003> mem 0xfa530000-0xfa53ffff,0xfa520000-0xfa52ffff irq 66 at device 4.0 numa-domain 0 on pci3 bge0: CHIP ID 0x00008003; ASIC REV 0x08; CHIP REV 0x80; PCI-X 33 MHz I'm now wondering if this could be related to the problems I was observing with USB drives as reported here: https://docs.freebsd.org/cgi/getmsg.cgi?fetch=0+0+archive/2021/freebsd-ppc/20210404.freebsd-ppc. That said, the machine has been very stable otherwise... Any ideas? Thanks -- jmmv.devhelp
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