ICH7 SATA and em interrupt sharing

[Patrick M. Hausen]

Hi, folks!

Seems finally I am able to reproduce part of the problems
some people see with their hardware.

I used device.hints to force em0 to share its irq
with atapci1 - the SATA300 controller in my machine.

atapci1: <Intel ICH7 SATA300 controller> port 0x30e8-0x30ef,0x30dc-0x30df,0x30e0-0x30e7,0x30d8-0x30db,0x30b0-0x30bf mem 0xdc500400-0xdc5007ff irq 19 at device 31.2 on pci0
em0: <Intel(R) PRO/1000 Network Connection Version - 6.0.5> port 0x4000-0x401f mem 0xdc080000-0xdc09ffff,0xdc000000-0xdc07ffff irq 19 at device 0.0 on pci4

And pronto:

em0: Missing Tx completion interrupt!
em0: Missing Tx completion interrupt!
em0: Missing Tx completion interrupt!
em0: Missing Tx completion interrupt!
em0: Missing Tx completion interrupt!
em0: Missing Tx completion interrupt!

And the system is really sluggish when used via SSH over that NIC.
I've yet to provoke the "detached disk" problem, though.

Other data that may be of interest:

6-STABLE as of Friday.

This patch applied:
http://lists.freebsd.org/pipermail/freebsd-net/2006-August/011352.html

debug.mpsafenet="1"

HTH,

Patrick M. Hausen
Leiter Netzwerke und Sicherheit
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