I'm getting device timeouts on bm0 under heavy network load.
This is with the latest sources (cvs updated within a few hours).
Sometimes I have to reset the machine to get the network back.
The Mac is plugged into a NetGear DS108 dual-speed hub.

Any ideas?

nfs_boot: my_domain=local
nfs_boot: my_addr=192.168.1.10
nfs_boot: my_mask=255.255.255.0
nfs_boot: gateway=192.168.1.1
root on center:/other/clients/yosemite/root
root file system type: nfs
bm0: device timeout
bm0: device timeout
nfs server center:/other/clients/yosemite/usr: not responding
nfs server center:/other/clients/yosemite/root: not responding
nfs server center:/other/clients/yosemite/root: is alive again
nfs server center:/other/clients/yosemite/usr: is alive again
nfs server center:/other/clients/yosemite/root: not responding
NetBSD 1.4K (GENERIC) #1: Wed Sep 15 16:46:16 PDT 1999
     matt@yosemite.local:/other/src/sys/arch/macppc/compile/GENERIC
CPU: 750 (Revision 202)
total memory = 65536 KB
avail memory = 55220 KB
using 844 buffers containing 3376 KB of memory
mainbus0 (root)
cpu0 at mainbus0: 512KB backside cache enabled
pci0 at mainbus0 bus 0
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 0 function 0
pchb0: Motorola MPC106 Host-PCI Bridge (grackle) (rev. 0x40)
ppb0 at pci0 dev 13 function 0: Digital Equipment DECchip 21154 PCI-PCI Bridge (
rev. 0x02)
pci1 at ppb0 bus 1
pci1: i/o enabled, memory enabled
Texas Instruments LYNX FireWire Host Controller (Firewire serial bus, revision 0
x02) at pci1 dev 0 function 0 not configured
pciide0 at pci1 dev 1 function 0: CMD Technology PCI0646
pciide0: bus-master DMA support present
pciide0: primary channel configured to native-PCI mode
pciide0: using irq 26 for native-PCI interrupt
wd0 at pciide0 channel 0 drive 0: <IBM-DTTA-371440>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 13783MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 28229040 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
pciide0: secondary channel configured to native-PCI mode
pciide0: secondary channel ignored (disabled)
pciide0:0: bogus intr
obio0 at pci1 dev 5 function 0: addr 0x80800000
interrupt-controller at obio0 offset 0x10 not configured
scsi at obio0 offset 0x10000 not configured
escc-legacy at obio0 offset 0x12000 not configured
zsc0 at obio0 offset 0x13000: irq 15,16
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
davbus at obio0 offset 0x14000 not configured
power-mgt at obio0 offset 0x0 not configured
fdc at obio0 offset 0x15000 not configured
adb0 at obio0 offset 0x16000 irq 18: 0 targets
aed0 at adb0 addr 0: ADB Event device
wdc0 at obio0 offset 0x20000 irq 13
atapibus0 at wdc0 channel 0
cd0 at atapibus0 drive 0: <CD-ROM CDU701-25, , 1.3r> type 5 cdrom removable
cd0: drive supports PIO mode 4, DMA mode 2
bm0 at obio0 offset 0x11000 irq 42,33: address 00:50:e4:00:9d:4e
nvram0 at obio0 offset 0x60000
ohci0 at pci1 dev 6 function 0: Opti RM861HA (rev. 0x10)
ohci0: interrupting at irq 28
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0
uhub0 at usb0
uhub0: Opti OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
SPLUSBCHECK failed 0x0!=0x30000122, ../../../../dev/usb/usbdi.c:729
ums0 at uhub0 port 1 configuration 1 interface 0
ums0: Logitech USB-PS/2 Mouse M-BA47, rev 1.00/1.10, addr 2, iclass 3/1
ums0: 4 buttons and Z dir.
wsmouse1 at ums0 mux 0
uhub1 at uhub0 port 2
uhub1: NEC hub, class 9/0, rev 1.00/1.00, addr 3
uhub1: 4 ports with 4 removable, bus powered
ukbd0 at uhub1 port 1 configuration 1 interface 0
ukbd0: Alps Electric M2452, rev 1.00/1.01, addr 4, iclass 3/1
wskbd1 at ukbd0 (mux 1 ignored for console): console keyboard
ofb0 at pci0 dev 16 function 0: ATI Technologies product 0x5245
ofb0: 640 x 480, 8bpp
wsdisplay0 at ofb0: console (std, vt100 emulation), using wskbd1
boot device: bm0
nfs_boot: trying DHCP/BOOTP
nfs_boot: DHCP server: 192.168.1.2
nfs_boot: my_domain=local
nfs_boot: my_addr=192.168.1.10
nfs_boot: my_mask=255.255.255.0
nfs_boot: gateway=192.168.1.1
root on center:/other/clients/yosemite/root
root file system type: nfs
nfs server center:/other/clients/yosemite/root: not responding
bm0: device timeout
nfs server center:/other/clients/yosemite/root: is alive again

-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message