em interface slow down on 8.0R

[Hiroki Sato]

Jack Vogel <jfvogel at gmail.com> wrote
  in <2a41acea0912052327t7830f85aw5b4b581ab3f09be9 at mail.gmail.com>:

jf> The 82573, when onboard (LOM) is usually special, it is used by system
jf> management
jf> firmware.  Go to the system BIOS and turn off management, see if that
jf> eliminates the
jf> periodic hang.

 Well, I am using them without enabling such a BIOS feature on the two
 boxes.

 I was monitoring for 1 week after replacing the kernel of 8.0-STABLE
 with 8.0R.  Frequency of the symptom was reduced, but occurred once
 in 2-3 days.  So it is reproducible on 8.0R, too.

 Just after the symptom occurred, dev.em.[01].debug showed the
 following:

Dec 17 16:50:03 pool kernel: em0: Std mbuf failed = 0
Dec 17 16:50:03 pool kernel: em0: Std mbuf cluster failed = 9612

Dec 17 16:50:12 pool kernel: em1: Std mbuf failed = 0
Dec 17 16:50:12 pool kernel: em1: Std mbuf cluster failed = 15183

 The other numbers look normal to me.  dev.em.[01].stats reported
 almost all of the counters other than "Good Packets" are zero.

 Doing ifconfig down/up could make it work again, sending/receiving 10
 packets or so it stopped.

-- Hiroki
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