mad Engineer
2014-May-26 19:18 UTC
Re: [Xen-devel] PV Memory allocated difference in kernel 2.6.18 and 3.2
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 (ubuntu 10.04 64bit)
*free -k*
total used free shared buffers
cached
Mem: 504856 84240 420616 0 7952 45152
*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@citrix.com>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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