Re: [Xen-users] pv_ops 2.6.31.6

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Jan 23, 2010 at 09:38:28AM -0000, Ian Tobin wrote:
> Hi,
> 
> Appologies for the delay.
> 
> Xm top shows that a DomU (windows 2008) was using 100% cpu however it wasn't 
> actually doing anything 
> but i killed it off so no DomUs were running and the system was still 
> painfully slow until its rebooted but it still slows down.
>

So you're saying the system was slow even after the windows 2008 guest was 
killed? Something definitely wrong there..
Any errors in "xm dmesg" ? or in dom0 "dmesg" ?

Was this 32bit dom0?

> 
> I have discovered the RAM is not the recommended RAM kit for this motherboard 
> so i have ordered 8gb 
> of the correct RAM type.  Do you think this would be the cause?
> 

Who knows.. maybe. 

Make sure you run memtest86+ for a long time to make sure the RAM is ok.
Sometimes the memory errors will show up only after a couple of _days_ of 
running memtest.

http://memtest.org/download/4.00/memtest86+-4.00.iso.zip

-- Pasi

> thanks
> 
> Ian
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: 22 January 2010 11:23
> To: Ian Tobin
> Cc: Olivier B.; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] pv_ops 2.6.31.6
> 
> On Fri, Jan 22, 2010 at 10:52:04AM -0000, Ian Tobin wrote:
> > Ive got a major performance issue.  If i boot up the dom0 without starting 
> > xen and copy a large file to it via ftp its fine.
> > 
> > As soon as i run xend start the Dom0 gets slower and slower until the 
> > server is at a crawl so its unusable.
> > 
> > Anyone else getting slow response?
> > 
> 
> I haven't seen that.
> 
> Please monitor your dom0 with "top" and also with "xm top". 
> 
> What do they reveal? Does some process start eating more and more CPU time? 
> Does some process leak memory? Does dom0 have iowait? 
> 
> Did you limit dom0_mem=512M or similar? 
> 
> -- Pasi
> 
> > 
> > 
> > 
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Olivier B.
> > Sent: 22 January 2010 08:34
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-users] pv_ops 2.6.31.6
> > 
> > For me restore/live migration doesn't work.
> > 
> > For dom0 I use the version 2.6.31.6 00751-g600545, with vanilla 
> > 2.6.31.12 pv_ops version on domU, and debian xen 3.4.2-2
> > 
> > On restore I obtain that :
> > 
> > [49532.764004] <4>------------[ cut here ]------------
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] <4>WARNING: at arch/x86/xen/time.c:180 
> > xen_sched_clock+0x7c/0xaf()
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] <d>Modules linked in:
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  nf_conntrack_ipv4
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  nf_defrag_ipv4
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  xt_state
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  nf_conntrack
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  dm_snapshot
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [last unloaded: scsi_wait_scan]
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] Pid: 30422, comm: kstop/0 Tainted: G        W  
> > 2.6.31.12-dae-xen #1
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] Call Trace:
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8104e0d1>] warn_slowpath_common+0x88/0xb6
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8104e121>] warn_slowpath_null+0x22/0x38
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8100dc4f>] xen_sched_clock+0x7c/0xaf
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8101829d>] sched_clock+0x9/0xd
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8106b73b>] sched_clock_cpu+0xa7/0x168
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81047d4b>] update_rq_clock+0x26/0x48
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81048c11>] try_to_wake_up+0xac/0x2af
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8101135d>] ? retint_restore_args+0x5/0x6
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81048e34>] default_wake_function+0x20/0x36
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8103bcdd>] __wake_up_common+0x58/0xa2
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8106120e>] ? wq_barrier_func+0x0/0x36
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8103e07d>] complete+0x49/0x73
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8106122e>] wq_barrier_func+0x20/0x36
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81060d8d>] worker_thread+0x156/0x20d
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8100dd1f>] ? xen_restore_fl_direct_end+0x0/0x1
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81065b7f>] ? autoremove_wake_function+0x0/0x5a
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81060c37>] ? worker_thread+0x0/0x20d
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81065759>] kthread+0x9b/0xa3
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff810119ea>] child_rip+0xa/0x20
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff81010bac>] ? int_ret_from_sys_call+0x7/0x1b
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff8101135d>] ? retint_restore_args+0x5/0x6
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004]  [<ffffffff810119e0>] ? child_rip+0x0/0x20
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] <4>---[ end trace bbe4ba0e56e4a4ae ]---
> > [49532.764004] BUG: recent printk recursion!
> > [49532.764004] <4>------------[ cut here ]------------
> > 
> > 
> > But except that, it works fine.
> > 
> > Olivier
> > 
> > Pasi Kärkkäinen a écrit :
> > > On Thu, Jan 21, 2010 at 09:01:21PM -0000, Ian Tobin wrote:
> > >   
> > >>    Hi,
> > >>
> > >>
> > >>
> > >>    Quick question, is the 2.6.31.6 kernel in Jermeys tree stable enough 
> > >> for a
> > >>    live environment?  Ive been playing with it and seems to work quite 
> > >> well.
> > >>
> > >>     
> > >
> > > It works for many people.. so please keep using it, and report any 
> > > issues/bugs found. 
> > >
> > > Also make sure you monitor the changelogs, it's still under development 
> > > so you want to
> > > upgrade every now and then to get the latest bits.
> > >
> > > xen/master branch changelog:
> > > http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=xen/master
> > >
> > > Whole git tree changelog:
> > > http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git
> > >
> > > -- Pasi
> > >
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> > >   
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> > 
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> 
> 

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