[Xen-users] Xen bridging issue.

[johnny Strom <johnny.strom@xxxxxxxxxxxxxxxxx>]

Hello

I sent an email before about bridging not working in domU using Debian 
8.1 and XEN 4.4.1.
It was not the network card "igb" as I first taught.

I managed to get bridging working in DOMU if is set the limit of cpu's 
in dom0 to 14, this is from /etc/default/grub
when it works ok:

GRUB_CMDLINE_XEN="dom0_max_vcpus=14 dom0_vcpus_pin"


Is there any known issue/limitations running xen with more with more 
than 14 CPU cores in dom0?

The cpu in question is:

processor       : 16
vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz
stepping        : 2
microcode       : 0x2d
cpu MHz         : 2298.718
cache size      : 25600 KB
physical id     : 0
siblings        : 17
core id         : 11
cpu cores       : 9
apicid          : 22
initial apicid  : 22
fpu             : yes
fpu_exception   : yes
cpuid level     : 15
wp              : yes
flags           : fpu de tsc msr pae mce cx8 apic sep mca cmov pat 
clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good 
nopl nonstop_tsc eagerfpu pni pclmulqdq monitor est ssse3 fma cx16 
sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand 
hypervisor lahf_lm abm ida arat epb xsaveopt pln pts dtherm fsgsbase 
bmi1 avx2 bmi2 erms
bogomips        : 4597.43
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:




If I set it to 17 in dom0:

GRUB_CMDLINE_XEN="dom0_max_vcpus=17 dom0_vcpus_pin"

Then I get this oops whan I try to boot domU with 40 vcpu's.

[    1.588313] systemd-udevd[255]: starting version 215
[    1.606097] xen_netfront: Initialising Xen virtual ethernet driver
[    1.648172] blkfront: xvda2: flush diskcache: enabled; persistent 
grants: enabled; indirect descriptors: disabled;
[    1.649190] blkfront: xvda1: flush diskcache: enabled; persistent 
grants: enabled; indirect descriptors: disabled;
[    1.649705] Setting capacity to 2097152
[    1.649716] xvda2: detected capacity change from 0 to 1073741824
[    1.653540] xen_netfront: can't alloc rx grant refs
[    1.653547] net eth1: only created 17 queues
[    1.654027] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000018
[    1.654033] IP: [<ffffffffa0063cc4>] netback_changed+0x964/0xee0 
[xen_netfront]
[    1.654041] PGD 0
[    1.654044] Oops: 0000 [#1] SMP
[    1.654048] Modules linked in: xen_netfront(+) xen_blkfront(+) 
crct10dif_pclmul crct10dif_common crc32c_intel
[    1.654057] CPU: 3 PID: 209 Comm: xenwatch Not tainted 3.16.0-4-amd64 
#1 Debian 3.16.7-ckt11-1+deb8u3
[    1.654061] task: ffff880faf477370 ti: ffff880faf478000 task.ti: 
ffff880faf478000
[    1.654064] RIP: e030:[<ffffffffa0063cc4>] [<ffffffffa0063cc4>] 
netback_changed+0x964/0xee0 [xen_netfront]
[    1.654071] RSP: e02b:ffff880faf47be20  EFLAGS: 00010202
[    1.654074] RAX: 0000000000000000 RBX: ffff880002a729c0 RCX: 
0000000000000001
[    1.654077] RDX: 000000000066785c RSI: ffff880002a72a58 RDI: 
0000000000003f1f
[    1.654080] RBP: ffff880faa44e000 R08: ffffc90006240000 R09: 
ffffea0036d3f180
[    1.654083] R10: 000000000000251e R11: 0000000000000000 R12: 
ffff880faa44f000
[    1.654086] R13: ffff880002a72a58 R14: 00000000000729c0 R15: 
ffff880fab6f4000
[    1.654093] FS:  0000000000000000(0000) GS:ffff880fb7060000(0000) 
knlGS:0000000000000000
[    1.654096] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.654099] CR2: 0000000000000018 CR3: 0000000001813000 CR4: 
0000000000042660
[    1.654102] Stack:
[    1.654104]  ffff880faf5aec00 ffff880f0000000f 0000001100000001 
ffff880faf5aec00
[    1.654109]  ffff880002a6b041 ffff880002a6af84 00000001af561000 
0000001100000001
[    1.656945]  ffff8800028e9df1 ffff8800028e8880 ffff880faf47beb8 
ffffffff8135b9e0
[    1.656945] Call Trace:
[    1.656945]  [<ffffffff8135b9e0>] ? unregister_xenbus_watch+0x220/0x220
[    1.656945]  [<ffffffff8135ba78>] ? xenwatch_thread+0x98/0x140
[    1.656945]  [<ffffffff810a7a40>] ? prepare_to_wait_event+0xf0/0xf0
[    1.656945]  [<ffffffff81087f7d>] ? kthread+0xbd/0xe0
[    1.656945]  [<ffffffff81087ec0>] ? kthread_create_on_node+0x180/0x180
[    1.656945]  [<ffffffff815114d8>] ? ret_from_fork+0x58/0x90
[    1.656945]  [<ffffffff81087ec0>] ? kthread_create_on_node+0x180/0x180
[    1.656945] Code: 48 89 c6 e9 bd fd ff ff 48 8b 3c 24 48 c7 c2 b3 52 
06 a0 be f4 ff ff ff 31 c0 e8 38 61 2f e1 e9 54 ff ff ff 48 8b 43 20 4c 
89 ee <48> 8b 78 18 e8 13 63 2f e1 85 c0 0f 88 b0 fd ff ff 48 8b 43 20
[    1.656945] RIP  [<ffffffffa0063cc4>] netback_changed+0x964/0xee0 
[xen_netfront]
[    1.656945]  RSP <ffff880faf47be20>
[    1.656945] CR2: 0000000000000018
[    1.656945] ---[ end trace d92264e4041d27a1 ]---



Best regards Johnny

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