Dell PowerEdge R720 Broadcom Gigabit Ethernet BCM5720 Tested kernel: http://ftp.openbsd.org/pub/OpenBSD/snapshots/amd64/bsd.rd http://ftp.openbsd.org/pub/OpenBSD/snapshots/amd64/bsd.mp
dmesg: OpenBSD 5.3-current (RAMDISK_CD) #96: Wed Apr 3 02:19:34 MDT 2013 bge2 at pci2 dev 0 function 0 "Broadcom BCM5720" rev 0x00, BCM5720 A0 (0x5720000), APE firmware NCSI 1.1.7.0: apic 1 int 3, address 90:b1:1c:3a:a8:19 brgphy2 at bge2 phy 1: BCM5720C 10/100/1000baseT PHY, rev. 0 It's OK <156 . ping -s 156 10.2.1.29 164 bytes from ... NO reply >=157,(not resetted,can return to normal with small packet test) ping -s 157 10.2.1.29 ... 0 packets received Even larger packet, NIC resetted(wait ... return to normal after reseted) ping -s 275 10.2.1.29 bge2: watchdog timeout -- resetting FreeBSD have encountered same issue,I tested, same issue found in: http://ftp.freebsd.org/pub/FreeBSD/ISO-IMAGES-amd64/9.1/FreeBSD-9.1-RELEASE-amd64-dvd1.iso This problem was fixed by FreeBSD team: http://www.freebsd.org/cgi/query-pr.cgi?pr=171121 I tested, This version have fixed this problem: http://ftp.freebsd.org/pub/FreeBSD/snapshots/amd64/amd64/ISO-IMAGES/10.0/FreeBSD-10.0-CURRENT-amd64-20130323-r248655-release.iso
