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Re: kern/48476: wm(4) transmit hang

On 2014/01/08 2:55, David Holland wrote:
The following reply was made to PR kern/48476; it has been noted by GNATS.

From: David Holland <>
Subject: Re: kern/48476: wm(4) transmit hang
Date: Tue, 7 Jan 2014 17:54:50 +0000

  (not sent to gnats)
From: Manuel Bouyer <>
  Subject: Re: kern/48476: wm(4) transmit hang
  Date: Tue, 7 Jan 2014 15:24:19 +0100
On Tue, Dec 24, 2013 at 10:20:00AM +0000, wrote:
  > >Description:
  > 	This is on, a Supermicro X7DBR motherboard.
  > 	Its wm0 interface is connected to a gigabit switch and is identified
  > 	as:
  > wm0 at pci4 dev 0 function 0: i80003 dual 1000baseT Ethernet (rev. 0x01)
  > wm0: interrupting at ioapic0 pin 18
  > wm0: PCI-Express bus
  > wm0: 65536 word (16 address bits) SPI EEPROM
  > wm0: Ethernet address 00:30:48:31:43:82
  > ikphy0 at wm0 phy 1: i82563 10/100/1000 media interface, rev. 2
  > ikphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX
  > , auto
  > # ifconfig wm0
  > wm0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
  >         address: 00:30:48:31:43:82
  >         media: Ethernet autoselect (1000baseT full-duplex)
  >         status: active
  > 	under traffic, transmission stops. ping complains with
  > 	"no buffer space available" and named with:
  > # Dec 24 11:01:07 antioche named[181]: client ( error sending response: not enough free resources
  > 	ifconfig wm0 doesn't show "OACTIVE flag".
  > 	A "ifconfig wm0 down up" fixes it for a few minutes.
  > 	Note that this system has been used for other tasks before,
  > 	with older versions of NetBSD without problems.
  > 	Also, other systems with different wm(4) models running
  > 	kernels buidls from the same source shows no problems even
  > 	under load.
It looks like disabling tso4 and tso6 helps, but I don't know if TSO is the
  real cause of the problem, or if it only hides it by lowering the network
  load a bit.
  Manuel Bouyer <>
       NetBSD: 26 ans d'experience feront toujours la difference

Do you still have the system?

This PR is for netbsd-6 and it's EOLed.
After reporting this PR, an problem for TSO is fixed in rev. 1.269
and pulled up to netbsd-6 branch (rev.

Is it OK to close this PR, or keep it?

                SAITOH Masanobu (

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