[Bug 376451] [NEW] Network hickups to domU's when running a lot of domU's

[Wido den Hollander]

Public bug reported:

Hello,

I have two systems with the following specifications:

- 2x Intel(R) Xeon(R) CPU           E5420
- 64GB DDR2 FB-DIMM
- 2x Intel 80003ES2LAN
- SuperMicro X7DB8 mainboard
- Areca ARC-1680ix-16 RAID Controller

On these machine's in run Ubuntu 8.0.4.2 with Xen 3.2

The kernel has been customized to raise the number of NR_DYNIRQS, please
refer to my other bug report (#341846)

Now i have tackled that problem but now i am starting to have issues
with network connectivity for existing domU's. They run fine, but for no
good reason they loose their network for about 2 minutes at the time
while the dom0 works fine.

I have attached some data about the system (like xm list, xm dmesg,
lspci, etc, etc)

Like i said, i have two systems, on with about 100 domU's (system A) and
the other with 10 domU's (system B). They are both 100% identical in
software and hardware, but only the domU's on the system with 100 domU's
are experiencing these problems.

On system A i found the following messages when running "xm dmesg"

(XEN) printk: 271 messages suppressed.
(XEN) grant_table.c:1262:d0 Bad flags (0) or dom (0). (expected dom 0)

After some Googling i found old messages about a issue in the Xen grant
table, but no real solution.

Now one of the interesting things is the messages i found inside a domU:

[135111.985303] netfront: rx->offset: 0, size: 4294967295
[135111.985330] netfront: rx->offset: 0, size: 4294967295
[135111.985337] netfront: rx->offset: 0, size: 4294967295

This indicates something goes wrong inside netfront.c, but for this i
also found some reports, but no real solutions.

System B is not running a lot of domU's at the moment, but i think these
problems will also rise on that system as soon as it hits some kind of
barrier.

I hope somebody has a clue what is going on.

** Affects: xen-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: e1000 netfront xen

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Network hickups to domU's when running a lot of domU's
https://bugs.launchpad.net/bugs/376451
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