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Re: [Xen-devel] radeon in dom0/ivtv in domU: irq 16 nobody cared



> > Anyhow, what I would like you test is to provide 'noirqdebug' flag on
> > your Linux kernel command line. That should take care of the 'nobody
> > cared IRQ'. Please test and see if you your machine is more or less
> > sluggish.
I have had my system up and running for several days now, and indeed
the IRQ nobody cared has not occured. I do not see my system behave
any more sluggish than before. All the scheduled recordings seem to have
been recorded correctly (sometimes up to 3 in parallel).

> > Also, please do run this:
> > while (true)
> > do
> > sleep 10
> > cat /proc/interrupts | grep 16
> > done
> >
> > during the lifecycle of the whole machine. I am curious to see whether
> > you also get an IRQ storm (or if it is just a trickle - which is OK)
> > after launching the DomU guest.
Having done so, i notice that the count in dom0 and domU is identical,
and seems to increase with about ~100 or so per second while domU is
recording from /dev/video0. To me that does not seem unusual.


Probably unrelated, but although i do have compiz running, and quite some eye-
candy enabled in my dom0 Kde environement, the radeon driver still doesn't 
seem to generate any interupts. 


And probably also unrelated, dmesg in the domU shows a lot of these messages:
xennet: skb rides the rocket: 20 frags                                          
                                                                                
              
Pid: 0, comm: swapper Not tainted 2.6.32mh25 #6                                 
                                                                                
              
Call Trace:                                                                     
                                                                                
              
 <IRQ>  [<ffffffffa00b941a>] xennet_start_xmit+0x7d/0x680 [xen_netfront]        
                                                                                
              
 [<ffffffff8100eb49>] ? xen_force_evtchn_callback+0xd/0xf                       
                                                                                
              
 [<ffffffff8100f442>] ? check_events+0x12/0x20                                  
                                                                                
              
 [<ffffffff8108fd61>] ? lock_acquired+0x255/0x264                               
                                                                                
              
 [<ffffffff813dcc11>] dev_hard_start_xmit+0x23b/0x2e6                           
                                                                                
              
 [<ffffffff813efcd3>] sch_direct_xmit+0x6a/0x178                                
                                                                                
              
 [<ffffffff813dd04d>] dev_queue_xmit+0x279/0x3e2                                
                                                                                
              
 [<ffffffff813dcf3d>] ? dev_queue_xmit+0x169/0x3e2                              
                                                                                
              
 [<ffffffff813faaf2>] ? rcu_read_unlock+0x2b/0x46                               
                                                                                
              
 [<ffffffff813fad61>] ? nf_hook_slow+0xcf/0xe0                                  
                                                                                
              
 [<ffffffff8140f222>] ? ip_finish_output+0x0/0x71                               
                                                                                
              
 [<ffffffff8140e1b0>] ip_finish_output2+0x238/0x281                             
                                                                                
              
 [<ffffffff8140f291>] ip_finish_output+0x6f/0x71                                
                                                                                
              
 [<ffffffff8140f35f>] ip_output+0xcc/0xd5                                       
                                                                                
              
 [<ffffffff8140d894>] dst_output+0x10/0x12                                      
                                                                                
              
 [<ffffffff8140de17>] ip_local_out+0x23/0x27                                    
                                                                                
              
 [<ffffffff8140e507>] ip_queue_xmit+0x30e/0x3a4                                 
                                                                                
              
 [<ffffffff8100eb49>] ? xen_force_evtchn_callback+0xd/0xf                       
                                                                                
              
 [<ffffffff8100f442>] ? check_events+0x12/0x20                                  
                                                                                
              
 [<ffffffff81421e1a>] tcp_transmit_skb+0x672/0x6b0                              
                                                                                
              
 [<ffffffff8108d003>] ? mark_lock+0x27/0x21e                                    
                                                                                
              
 [<ffffffff81423a01>] tcp_write_xmit+0x7cd/0x8bd                                
                                                                                
              
 [<ffffffff814209ef>] ? tcp_established_options+0x33/0xae                       
                                                                                
              
 [<ffffffff81423b56>] __tcp_push_pending_frames+0x2f/0x5c                       
                                                                                
              
 [<ffffffff8141d352>] tcp_data_snd_check+0x29/0xef                              
                                                                                
              
 [<ffffffff8141f6b7>] tcp_rcv_established+0xd2/0x6a9                            
                                                                                
              
 [<ffffffff8100f442>] ? check_events+0x12/0x20                                  
                                                                                
              
 [<ffffffff81426dec>] tcp_v4_do_rcv+0x1bf/0x367                                 
                                                                                
              
 [<ffffffff814282df>] ? tcp_v4_rcv+0x2b8/0x66d                                  
                                                                                
              
 [<ffffffff814282df>] ? tcp_v4_rcv+0x2b8/0x66d                                  
                                                                                
              
 [<ffffffff81428482>] tcp_v4_rcv+0x45b/0x66d                                    
                                                                                
              
 [<ffffffff8140b6d6>] ip_local_deliver_finish+0x154/0x200                       
                                                                                
              
 [<ffffffff8140b7f9>] ip_local_deliver+0x77/0x7e                                
                                                                                
              
 [<ffffffff8140b120>] ip_rcv_finish+0x3a9/0x3d5                                 
                                                                                
              
 [<ffffffff8140b3d5>] ip_rcv+0x289/0x2c9                                        
                                                                                
              
 [<ffffffff813dbd72>] netif_receive_skb+0x415/0x43f                             
                                                                                
              
 [<ffffffffa00ba56d>] xennet_poll+0xaf9/0xca4 [xen_netfront]                    
                                                                                
              
 [<ffffffff813dc546>] net_rx_action+0xc8/0x21a                                  
                                                                                
              
 [<ffffffff81062f24>] __do_softirq+0x11c/0x1fd                                  
                                                                                
              
 [<ffffffff8124dd9b>] ? _raw_spin_unlock+0x8f/0x98                              
                                                                                
              
 [<ffffffff81013f9c>] call_softirq+0x1c/0x30                                    
                                                                                
              
 [<ffffffff81015523>] do_softirq+0x4b/0xa6                                      
                                                                                
              
 [<ffffffff8106299b>] irq_exit+0x4a/0x99                                        
                                                                                
              
 [<ffffffff812c08dd>] xen_evtchn_do_upcall+0x1af/0x1ec                          
                                                                                
              
 [<ffffffff81013fee>] xen_do_hypervisor_callback+0x1e/0x30                      
                                                                                
              
 <EOI>  [<ffffffff810093aa>] ? hypercall_page+0x3aa/0x100b                      
                                                                                
              
 [<ffffffff810093aa>] ? hypercall_page+0x3aa/0x100b                             
                                                                                
              
 [<ffffffff8100eb7c>] ? xen_safe_halt+0x10/0x1a                                 
                                                                                
              
 [<ffffffff8100c141>] ? xen_idle+0x51/0x5c                                      
                                                                                
              
 [<ffffffff81011d14>] ? cpu_idle+0xb0/0x107                                     
                                                                                
              
 [<ffffffff814678eb>] ? rest_init+0x7f/0x81                                     
                                                                                
              
 [<ffffffff81986d76>] ? start_kernel+0x417/0x422                                
                                                                                
              
 [<ffffffff819862c1>] ? x86_64_start_reservations+0xac/0xb0                     
                                                                                
              
 [<ffffffff81989f01>] ? xen_start_kernel+0x648/0x64f

And dmesg in dom0 (seems related to a chrome crash):
FIX bio-0: Marking all objects used
chrome[12644]: segfault at 7f6cc3b5ad0c ip 0000000000c10c47 sp 00007fff88da2a80 
error 4 in chrome[400000+262f000]
=============================================================================   
                                 
BUG bio-0: Poison overwritten                                                   
                                 
-----------------------------------------------------------------------------   
                                 

INFO: 0xffff88002fcfe58b-0xffff88002fcfe58b. First byte 0xeb instead of 0x6b
INFO: Allocated in mempool_alloc_slab+0x15/0x17 age=611 cpu=0 pid=10074     
INFO: Freed in mempool_free_slab+0x17/0x19 age=609 cpu=0 pid=0              
INFO: Slab 0xffffea000136c730 objects=32 used=31 fp=0xffff88002fcfe500 
flags=0x200000000040c3
INFO: Object 0xffff88002fcfe500 @offset=1280 fp=0x(null)                        
             

Bytes b4 0xffff88002fcfe4f0:  5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 
ZZZZZZZZZZZZZZZZ
  Object 0xffff88002fcfe500:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe510:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe520:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe530:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe540:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe550:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe560:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe570:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe580:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b eb 6b 6b 6b 6b 
kkkkkkkkkkkëkkkk
  Object 0xffff88002fcfe590:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 
kkkkkkkkkkkkkkkk
  Object 0xffff88002fcfe5a0:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 
kkkkkkkkkkkkkkk¥
 Redzone 0xffff88002fcfe5b0:  bb bb bb bb bb bb bb bb                         
»»»»»»»»        
 Padding 0xffff88002fcfe5f0:  5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 
ZZZZZZZZZZZZZZZZ
Pid: 914, comm: kjournald Tainted: G    B   W  2.6.32mh25 #6                    
              
Call Trace:
 [<ffffffff8111aaf8>] print_trailer+0x140/0x149
 [<ffffffff8111b024>] check_bytes_and_report+0xba/0xeb
 [<ffffffff8111b11f>] check_object+0xca/0x1ae
 [<ffffffff8111d239>] __slab_alloc+0x3a6/0x454
 [<ffffffff810e80f6>] ? mempool_alloc_slab+0x15/0x17
 [<ffffffff810e80f6>] ? mempool_alloc_slab+0x15/0x17
 [<ffffffff8111d897>] kmem_cache_alloc+0xb4/0x173
 [<ffffffff810e80f6>] mempool_alloc_slab+0x15/0x17
 [<ffffffff810e81df>] mempool_alloc+0x6c/0x11e
 [<ffffffff8100eb49>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff8100eb49>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff81155924>] bio_alloc_bioset+0x35/0xc2
 [<ffffffff811559db>] bio_clone+0x2a/0x7c
 [<ffffffffa001b9c0>] make_request+0x51b/0x697 [raid1]
 [<ffffffff813952ec>] md_make_request+0xcf/0x10d
 [<ffffffff8107ff97>] ? up_read+0x2b/0x2f
 [<ffffffff81230263>] generic_make_request+0x2ca/0x323
 [<ffffffff81480738>] ? sub_preempt_count+0x9/0x83
 [<ffffffff81230389>] submit_bio+0xcd/0xea
 [<ffffffff81150e27>] submit_bh+0xf4/0x117
 [<ffffffff811d6f6d>] journal_commit_transaction+0x95b/0xeea
 [<ffffffff8147dcf0>] ? _spin_unlock_irqrestore+0x70/0x7e
 [<ffffffff8106be6d>] ? try_to_del_timer_sync+0x73/0x81
 [<ffffffff8106be7b>] ? del_timer_sync+0x0/0xa6
 [<ffffffff811da626>] kjournald+0xf0/0x23c
 [<ffffffff8107c1fa>] ? autoremove_wake_function+0x0/0x39
 [<ffffffff811da536>] ? kjournald+0x0/0x23c
 [<ffffffff8107bedc>] kthread+0x7f/0x87
 [<ffffffff81013e9a>] child_rip+0xa/0x20
 [<ffffffff810137d4>] ? restore_args+0x0/0x30
 [<ffffffff8100f442>] ? check_events+0x12/0x20
 [<ffffffff8100f442>] ? check_events+0x12/0x20
 [<ffffffff81013e90>] ? child_rip+0x0/0x20
FIX bio-0: Restoring 0xffff88002fcfe58b-0xffff88002fcfe58b=0x6b


Regards,
Mark.

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