[Xen-bugs] [Bug 27] New: domU hang under network load

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/cgi-bin/bugzilla/show_bug.cgi?id=27

           Summary: domU hang under network load
           Product: Xen
           Version: 2.0
          Platform: Other
               URL: http://deuce.doc.wustl.edu/old_distribution/ACE-
                    5.3.1.tar.bz2
        OS/Version: Linux-2.6
            Status: NEW
          Severity: critical
          Priority: P1
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: rich@xxxxxxxxxxxxx


Environment:
------------

Hardware: 4-CPU (Xeon 2.8Ghz) HP Proliant 580
dom0/domU filesystem: SLES9 SP1
Xen version: 2.0-testing

Description:
------------

Repeatedly running ACE 5.3.1 TCP benchmark between two domU's on same machine
causes domU to hang.  

- No response to keyboard console
- Does respond to ping
- Telnet to ssh port in hung domain gets as far as opening the port, but no
greeting from the ssh daemon
- proc/sys/kernel/sysrq contains "1" to enable SysRq, but no response to "xm
sysrq" from dom0.

Backported tools/misc/xentrace/xenctx.c from -unstable to -testing to show EIP.
 It was mostly socket and vbd calls, which seems strange because the benchmark
client is already terminated at that point.

ACE test syntax:
----------------

Client: $ACE_ROOT/performance_tests/TCP/tcp_test -m 2048 -b 65535 -i 10000
<hostname>
Server: $ACE_ROOT/performance_tests/TCP/tcp_test -s -t 1 -m 2048 -b 65535 

SSH script for automated test reproduction available upon request.

Reproduction:
-------------

YES: Xen 2.0-testing domU kernel (2.6.11)
NO: Xen 2.0.5 domU kernel (2.6.10)

YES: 4 of 4 Xeon CPUs on HP580
YES: 2 of 4 Xeon CPUs on HP580 (using maxcpus=4 boot option to account for
hyperthreading)
NO: Uniprocessor P-M 1.7G
NO: Xeon 3.0G with hyperthreading



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