Re: [Xen-devel] VMX status report. Xen:25929 & Dom0:3.5.4

["Ren, Yongjie" <yongjie.ren@xxxxxxxxx>]

> -----Original Message-----
> From: Konrad Rzeszutek [mailto:ketuzsezr@xxxxxxxxx] On Behalf Of
> Konrad Rzeszutek Wilk
> Sent: Monday, September 24, 2012 9:16 PM
> To: Wu, GabrielX
> Cc: xen-devel@xxxxxxxxxxxxx; Ren, Yongjie; Liu, RongrongX; Liu, SongtaoX;
> Zhou, Chao
> Subject: Re: [Xen-devel] VMX status report. Xen:25929 & Dom0:3.5.4
> 
> > 6. Poor performance when do guest save/restore and migration with
> linux 3.1 dom0
> >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1784
> 
> Added some questions in the bug.


Output of "perf stat xl migrate 1 localhost" for localhost migration.

      87086.962947 task-clock                #    0.964 CPUs utilized
           132,882 context-switches          #    0.002 M/sec 
            10,252 CPU-migrations            #    0.000 M/sec 
            18,159 page-faults               #    0.000 M/sec 
     <not counted> cycles                  
     <not counted> stalled-cycles-frontend 
     <not counted> stalled-cycles-backend  
     <not counted> instructions            
     <not counted> branches                
     <not counted> branch-misses           

      90.299519242 seconds time elapsed

BTW, do you know why the last 6 counter didn't have data?
Only met this issue when running 'perf stat' command in Dom0.

The following is the output of "perf record -e cpu-clock xl migrate 1 
localhost" command.

[ perf record: Woken up 10 times to write data ]
[ perf record: Captured and wrote 3.321 MB perf.data (~145093 samples) ]
# Events: 86K cpu-clock
#
# Overhead          Command          Shared Object                            
Symbol
# ........  ...............  .....................  
................................
#
    32.08%  libxl-save-help  [kernel.kallsyms]      [k] hypercall_page
    27.42%              ssh  libcrypto.so.1.0.0     [.] 0x7a6ba         
    14.73%  libxl-save-help  [kernel.kallsyms]      [k] smp_call_function_many
     4.51%              ssh  libcrypto.so.1.0.0     [.] md5_block_asm_data_order
     4.19%              ssh  ssh                    [.] 0x28af6         
     1.83%              ssh  [kernel.kallsyms]      [k] hypercall_page
     1.44%              ssh  libcrypto.so.1.0.0     [.] AES_encrypt
     1.32%  libxl-save-help  [kernel.kallsyms]      [k] find_next_bit
     0.81%  libxl-save-help  [kernel.kallsyms]      [k] xen_send_IPI_one
     0.78%  libxl-save-help  [kernel.kallsyms]      [k] pvclock_clocksource_read
     0.71%  libxl-save-help  [kernel.kallsyms]      [k] unmap_single_vma
     0.66%              ssh  [kernel.kallsyms]      [k] copy_user_generic_string
     0.51%  libxl-save-help  [kernel.kallsyms]      [k] xen_vcpu_stolen
     (didn't include other more lines.)
Also, added update in the bugzilla.


> > 7. vcpu-set doesn't take effect on guest
> >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1822
> > 8.Fail to probe NIC driver in domu
> >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1824
> > 9. Dom0 cannot be shutdown before PCI device detachment from guest
> >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1826
> 
> The same - added some questions that I believe I asked on the mailing
> list last time.
my fault. I'll reply to the email thread you asked me the question.

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