Re: [Xen-devel] summary : xen performance tools

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 12 Jul 2010 10:48:36 +0800
<ben_ian@xxxxxxxxxxxx> wrote:

> Hi Mukesh,
> I had a different result on dom0 memory allocation report by xentop
> and top. The difference is usually around 7XXMB, and xentop is always
> reported fewer.
> 
> ------------------------------------------
> For example,  (xentop vs top => 1177508k vs 1960880k)
> 
> xentop - 12:24:17   Xen 4.0.0
> 5 domains: 1 running, 4 blocked, 0 paused, 0 crashed, 0 dying, 0
> shutdown Mem: 41879780k total, 41845196k used, 34584k free    CPUs: 8
> @ 2533MHz NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k)
> MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO   VBD_RD   VBD_WR
> VBD_RSECT  VBD_WSECT SSID centOS --b---         27    1.6
> 10489824   25.0   10489856      25.0     1    0        0        0
> 1 0        0        0          0          0    0 centOS4
> --b---          8    1.5    8392672   20.0    8392704      20.0
> 1    1        0        0    1 0        0        0          0
> 0    0 Domain-0 -----r        184   11.5    1177508    2.8   no
> limit       n/a     8    0        0        0    0 0        0
> 0          0          0    0 win2003 --b---          8    0.2
> 10489824   25.0   10489856      25.0     1    1        0        0
> 1 0        0        0          0          0    0 winxp
> --b---          7    0.2   10489824   25.0   10489856      25.0
> 1    1        0        0    1 0        0        0          0
> 0    0
> 
>  ---   
> top - 12:24:48 up 16 min,  5 users,  load average: 0.52, 0.38, 0.22
> Tasks: 226 total,   3 running, 223 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.5%us,  0.8%sy,  0.0%ni, 96.4%id,  2.2%wa,  0.0%hi,
> 0.0%si,  0.1%st Mem:   1960880k total,  1922052k used,    38828k
> free,     6528k buffers Swap: 51199992k total,        0k used,
> 51199992k free,   272924k cached
> 
> ---------------------------------------------------------------------------
> 
> 
> 
> I collect this result on Fedora12+kernel 2.6.32+xen4.0.0, and this
> will cause a kernel crash on my system when I try to enable
> ballooning and balloon one more 768MB dom-U under the upper example's
> status(dom0_men=1024)
> 
> Do you have any idea what might cause this result??
> PS: Under kernel 2.6.18+ xen3.4.2, the two values are the same.
> 
>  
> Thanks very much!
> Regards,
> Ben Ian
> 

Hi Ben,

Sorry, I've not dug into the details of the tools to see what's going
on. If I happen to figure it out, I'll let you know.

thanks
Mukesh


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