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here is my configs and log/tcpdump/ping/dmesg output

i see no visible changes in all of the logs output, but 16vcpus domU didn't work properly

and one more thing:

when i try to start domU with vcpus more than 16 then domU won't start at all

vcpus=17

[ Â Â0.896865] xen_netfront: can't alloc rx grant refs

[ Â Â0.896872] net eth1: only created 14 queues

[ Â Â0.897084] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018

[ Â Â0.897090] IP: [<ffffffff81687f42>] netback_changed+0x952/0xfa0

[ Â Â0.897099] PGD 0

[ Â Â0.897103] Oops: 0000 [#1] SMP

[ Â Â0.897107] Modules linked in:

[ Â Â0.897111] CPU: 2 PID: 129 Comm: xenwatch Not tainted 3.18.21 #1

[ Â Â0.897114] task: ffff88007b192800 ti: ffff88007b284000 task.ti: ffff88007b284000

[ Â Â0.897117] RIP: e030:[<ffffffff81687f42>] Â[<ffffffff81687f42>] netback_changed+0x952/0xfa0

[ Â Â0.897123] RSP: e02b:ffff88007b287d78 ÂEFLAGS: 00010202

[ Â Â0.897125] RAX: 0000000000000000 RBX: 00000000000729c0 RCX: 0000000000000001

[ Â Â0.897128] RDX: 0000000001555da0 RSI: ffff88001ee72a58 RDI: 0000000000003f1f

[ Â Â0.897131] RBP: ffff88007b287e08 R08: ffffc90000340000 R09: 0000000000000001

[ Â Â0.897134] R10: ffffea00007b5580 R11: ffffea0001ec8000 R12: ffff88001ee729c0

[ Â Â0.897137] R13: ffff88001ed54000 R14: ffff88001ee72a58 R15: ffff88001ed55000

[ Â Â0.897143] FS: Â0000000000000000(0000) GS:ffff88007cb00000(0000) knlGS:0000000000000000

[ Â Â0.897146] CS: Âe033 DS: 0000 ES: 0000 CR0: 0000000080050033

[ Â Â0.897148] CR2: 0000000000000018 CR3: 000000000201e000 CR4: 0000000000042660

[ Â Â0.900287] Stack:

[ Â Â0.900287] Âffff88007b287df8 ffff88001ee6af84 ffff88001ee6b041 ffff88007b321000

[ Â Â0.900287] Âffff88007b2c2000 ffff88000000000f ffff88007b321000 ffff880000000011

[ Â Â0.900287] Â000000017cb13300 000000015d13c5e0 0000002800000001 ffff88005d13c631

[ Â Â0.900287] Call Trace:

[ Â Â0.900287] Â[<ffffffff81460e4d>] xenbus_otherend_changed+0xad/0x110

[ Â Â0.900287] Â[<ffffffff81460210>] ? xenwatch_thread+0xb0/0x160

[ Â Â0.900287] Â[<ffffffff81460160>] ? unregister_xenbus_watch+0x220/0x220

[ Â Â0.900287] Â[<ffffffff814632a3>] backend_changed+0x13/0x20

[ Â Â0.900287] Â[<ffffffff814601ff>] xenwatch_thread+0x9f/0x160

[ Â Â0.900287] Â[<ffffffff818d1bf0>] ? _raw_spin_unlock_irqrestore+0x20/0x40

[ Â Â0.900287] Â[<ffffffff810af870>] ? prepare_to_wait_event+0x110/0x110

[ Â Â0.900287] Â[<ffffffff8108e889>] kthread+0xc9/0xe0

[ Â Â0.900287] Â[<ffffffff8108e7c0>] ? kthread_create_on_node+0x180/0x180

[ Â Â0.900287] Â[<ffffffff818d23d8>] ret_from_fork+0x58/0x90

[ Â Â0.900287] Â[<ffffffff8108e7c0>] ? kthread_create_on_node+0x180/0x180

[ Â Â0.900287] Code: c6 e9 d6 fd ff ff 48 8b 7d a0 48 c7 c2 db bb df 81 be f4 ff ff ff 31 c0 4c 8b 7d 90 e8 48 65 dd ff eb 8f 49 8b 44 24 20 4c 89 f6 <48> 8b 78 18 e8 55 67 dd ff 85 c0 0f 88 ca fd ff ff 49 8b 44 24

[ Â Â0.900287] RIP Â[<ffffffff81687f42>] netback_changed+0x952/0xfa0

[ Â Â0.900287] ÂRSP <ffff88007b287d78>

[ Â Â0.900287] CR2: 0000000000000018

[ Â Â0.900287] ---[ end trace 413a209251215943 ]---

i have custom kernel and i think i have some misconfigured options

at the moment i have properly working domU only if vcpu number is <= 15

2015-09-24 12:09 GMT+03:00 Ian Campbell <ian.campbell@xxxxxxxxxx>:

On Thu, 2015-09-24 at 09:56 +0100, Ian Campbell wrote:
> On Thu, 2015-09-24 at 03:16 +0300, Roman Shubovich wrote:
> > hi
> >
> > i have physical server with 40 cpu cores
> > and i need to create a hvm domu with at least 16 vcpus and 2 network
> > bridges
> > when i start that domu i have some not understable issue - the second
> > bridge has no traffic from network (works only first interface - first
> > declared in config file). i can see traffic with tcpdum on dom0, but
> > not
> > on vif interface that has been created by domu startup script.
> >
> > when i reduce number of vcpu to 15 or less then bridges works fine
>
> Please post some logs:

Also I didn't notice this went to xen-devel@, which is a list for
_development_ of Xen. User support and configuration issues belong on xen
-users@.

If I had noticed this I would have added -users to the CC and moved -devel
to BCC in my previous reply. If you see this before you reply to my
previous mail please adjust the Cc's appropriately, otherwise please try
and remember to use the appropriate list next time.

Thanks,
Ian.

>Â * dmesg of both host and guest
>Â * output of these commands in dom0 while the guest is running with 2
> vifs
>Â Â configured (but only one working):
>Â Â Â* "brctl show"
>Â Â Â* "ifconfig -a"
>Â * The output of "ifconfig -a" within the guest in the same
> configuration.
>Â * The guest configuration file you are using.
>
> Thanks.
> Ian.
>
> >
> > system:
> > dom0 ubuntu 14.04.03 kernel 3.18.21
> > domu ubuntu 14.04.03 kernel 3.18.21
> > tried xen:
> > xen 4.4
> > xen 4.5
> > xen 4.6
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Re: [Xen-users] [Xen-devel] [BUG] 16 vcpus + 2 vif bridge = issue ?