kern/100138: Unstable Broadcom NetXtreme II (BCM5708) PCI/PCIe Gigabit Ethernet

Scott Wilson scott.wilson at
Sun Aug 6 03:50:20 UTC 2006

The following reply was made to PR kern/100138; it has been noted by GNATS.

From: "Scott Wilson" <scott.wilson at>
To: bug-followup at, galaluk at
Subject: Re: kern/100138: Unstable Broadcom NetXtreme II (BCM5708) PCI/PCIe Gigabit Ethernet
Date: Sun, 6 Aug 2006 05:40:27 +0200

 I am still experiencing this problem on a PowerEdge 1950 running amd64
 port with the patch mentioned in this pr:
 FreeBSD 6.1-RELEASE-p3 #0: Tue Aug  1 20:23:58 EDT 2006
     root at
 ---------- Forwarded message ----------
 From: Pyun YongHyeon <pyunyh at>
 Date: Aug 5, 2006 5:10 AM
 Subject: Re: Re: bce0: Error mapping mbuf into TX chain!
 On Fri, Aug 04, 2006 at 03:52:40PM +0200, Scott Wilson wrote:
  > On 7/13/06, Doug Ambrisko <ambrisko at> wrote:
  > >David (Controller AE) Christensen writes:
  > >| Sorry, I've been out on vacation and just got back into town.  I'll MFC
  > >| the patch within the next day or two.
  > >
  > >I'll let you merge in the down/up fix that I put into -current.
  > >
  > >Doug A.
  > Hi, I just had a bce interface lock up with the same problem:
  > Aug  4 07:00:16 pe3 kernel: bce0: /usr/src/sys/dev/bce/if_bce.c(4644):
  > Error mapping mbuf into TX chain!
  > Aug  4 07:00:47 pe3 last message repeated 368 times
  > ....
  > running v of if_bce.c from RELENG_6 which has the
  > defragmentation patch mentioned in this thread.  Any suggestions on
  > how I can help find a fix?
  > scott
 Hmm... I can see several bus_dma(9) related bugs in bce(4).
 For architectures that have IOMMU hardware it may have corrupted DMA
 mapping and I'm pretty sure it wouldn't work on sparc64.
 When it has to handle many fragmented frame or has insufficient
 number of free Tx descriptors it would show unexpected results.
 Unfortunately I don't have hardwares supported by bce(4) and
 fixing requiries a working hardware. :-(
 Pyun YongHyeon

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