Re: [Xen-users] [Xen-devel] PV Memory allocated difference in kernel 2.6.18 and 3.2

[mad Engineer <themadengin33r@xxxxxxxxx>]

Thanks Ian,

i think i started noticing the difference on centos 5.7(2.6.18) and Ubuntu 12.04 (3.2.0-48) thats why i posted that.

Now as per you suggestion i created ubuntu 10.04 which is 2.6.32-60-generic

so now the comparison is between 2.6.18 and 2.6.32 but on different distros,not sure whether i can compare both.

2.6.18 (centos 5.7 64bit)

free -k
         total       used       free     shared    buffers     cached
Mem:      524288     445004      79284          0      18040     182652

dmesg|grep -i mem

Memory: 481820k/524288k available (6553k kernel code, 448k absent, 42020k reserved, 6642k data, 924k init)

dmesg: http://pastebin.com/FmVRniLJ

2.6.32-60-generic Â(ubuntu 10.04 64bit)Â

free -k

         Âtotal    used    free   shared  Âbuffers   cached

Mem: Â Â Â Â504856 Â Â Â84240 Â Â 420616 Â Â Â Â Â0 Â Â Â 7952 Â Â Â45152

dmesg|grep -i mem

Memory: 478396k/524288k available (5449k kernel code, 404k absent, 45488k reserved, 2985k data, 884k init)

dmesg: http://pastebin.com/qGW06kar

Centos 5.7 is showing Zero wastage of RAM but ubuntu shows a slight difference. of ~19MB,where as ubuntu 12.04 shows a difference of ~23 Mb.

Thanks,

On Wed, May 21, 2014 at 10:21 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Tue, 2014-05-20 at 20:14 +0530, mad Engineer wrote:

> What might be the reason for this behavior, can this has anything to
> do with with pvops kernel or is it because of changes in Linux 3.0+
> Memory Management?

I think 2.6.18 and 3.2 are too far removed from each other to be able to
sensibly compare in this way.

Perhaps if you compared the pvops 3.2 stuff with the suse classic-Xen
3.2 stuff that might be more relevant.

Ian.

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