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RE: [Xen-users] Xen 3.0 and Hyperthreading an issue?

To: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Xen 3.0 and Hyperthreading an issue?
From: "Cole, Ray" <Ray_Cole@xxxxxxx>
Date: Mon, 5 Dec 2005 12:52:04 -0600
Cc: ian.pratt@xxxxxxxxxxxx
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Thread-topic: [Xen-users] Xen 3.0 and Hyperthreading an issue?
Done.  Filed bug #432.  Here is the information I entered into it for reference.

Using pull from hg as of this morning (12/5/2005).

If I enable hyperthreading on my machine then Xen gets into trouble within 
minutes of starting up user domains.  With hyperthreading disabled it ran for 
several hours with no problem.

Machine is a Dell Optplex GX280 with 2G of memory.

I get the following on the screen when it hangs:

[<c040acc0>] fn_hash_lookup+0xb0/0xc0
[<c03dba3b>] ip_route_input_slow+0x7cb/0x7e0
[<c0418f08>] br_nf_forward_finish+0xb8/0x140
[<c0413760>] br_forward_finish+0x0/0x70
[<c04192bc>] br_nf_forward_arp+0x17c/0x1c0
[<c013eed6>] buffered_rmqueue+0x106/0x250
[<c03cfb65>] neigh_update+0x235/0x350
[<c03c4214>] kfree_skbmem+0x24/0x30
[<c0400c11>] arp_process+0x61/0x510
[<c0414420>] br_handle_frame_finish+0x0/0x130
[<c04011b7>] arp_rcv+0xf7/0x170
[<c0410fa1>] packet_rcv_spkt+0x151/0x260
[<c03ca9a1>] netif_receive_skb+0x1e1/0x250
[<c012184e>] tasklet_action+0x4a/0xd0
[<c0121555>] __do_softirq+0x95/0xb0
[<c01215bd>] do_softirq+0x4b/0x50
[<c01215bd>] do_IRQ+0x22/0x30
[<c01048b0>] evtchn_do_upcall+0x70/0xa0
[<c0108c68>] hypervisor_callback+0x2c/0x34
[<c01068a2>] xen_idle+0x42/0x90
[<c0106933>] cpu_idle+0x43/0x50
[<c055e85d>] start_kernel+0x18d/0x1d0
[<c055e390>] unknown_bootoption+0x0/0x210
Kernel panic - not synching: BUG!

-----Original Message-----
From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx]
Sent: Monday, December 05, 2005 12:33 PM
To: Cole, Ray; xen-users@xxxxxxxxxxxxxxxxxxx
Cc: ian.pratt@xxxxxxxxxxxx
Subject: RE: [Xen-users] Xen 3.0 and Hyperthreading an issue?

> I turned hyperthreading off on the machine and it seems to be 
> able to boot with all 4 user domains just fine without the 
> need for sleeps inbetween (very consistently dies if HT is 
> enabled and I don't sleep a little while between domain 
> starts).  So I'm leaving HT off for now to see if it remains 
> stable with HT disabled.

There certainly shouldn't be an issue with HT. If you leave it in text
mode do you see an oops message?

Please can you file this on bugzilla, including details about your

> I was going to report this on bugzilla, but 
> bugzilla.xensource.com is giving me a server error right now.

bugzilla should be back up -- we decided to move it onto another hosting
site in preparation for some heavy traffic on the downloads servers.


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