hot plug memory in el7

8 Dec 2015

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> On 10 Dec 2015, at 13:16, Gianluca Cecchi <gianluca.cecchi@gmail.com> =
wrote:
>=20
> On Thu, Dec 10, 2015 at 12:24 PM, Michal Skrivanek =
<mskrivan@redhat.com <mailto:mskrivan@redhat.com>> wrote:
>=20
>=20
> >
> > Yes, CentOS 7.1 updated up to a couple of days ago.
>=20
> Can you try 7.2? I don=E2=80=99t remember exactly but it may be that =
in earlier guests it=E2=80=99s not automatic. Check some tips for =
onlining memory explicitly
>=20
> 5.2. How to online memory
>  ------------
> Even if the memory is hot-added, it is not at ready-to-use state.
> For using newly added memory, you have to "online" the memory block.
>=20
> For onlining, you have to write "online" to the memory block's state =
file as:
>=20
> % echo online > /sys/devices/system/memory/memoryXXX/state
>=20
> =20
>=20
> Hello,
> with your suggestions it worked as expected, without updating any =
packages in VM 7.1 guest (I seemed to remember that the forced online =
operation should not be necessary any more=E2=80=A6):

great!
with 7.2 it should be automatic. I think with Windows it works =
automatically as well.

>=20
> Starting state with 10Gb of ram inside the VM
> [root@racclient1 ~]# ll -d  /sys/devices/system/memory/memory* | wc -l
> 80
>=20
> slots defined:
> 0 --> 23
> 32 --> 87
>=20
> Increase from web gui memory from 10240 to 12288
>=20
> I see this in messages as expected
>=20
> Dec 10 12:59:32 racclient1 kernel: init_memory_mapping: [mem =
0x2c0000000-0x33fffffff]
>=20
> In /sys/devices/system/memory I see 16 new memoryxx directories =
(probably each one addressing 128Mb...)
>=20
> 88
> 89
> 90
> 91
> 92
> 93
> 94
> 95
> 96
> 97
> 98
> 99
> 100
> 101
> 102
> 103
>=20
> They have indeed been added but are offline, eg
>=20
> latest previous one:
> [root@racclient1 ~]# cat /sys/devices/system/memory/memory87/state=20
> online
>=20
> first newly added one:
> [root@racclient1 ~]# cat /sys/devices/system/memory/memory88/state=20
> offline
>=20
> [root@racclient1 ~]# cat /sys/devices/system/memory/memory87/online=20
> 1
> [root@racclient1 ~]# cat /sys/devices/system/memory/memory88/online=20
> 0
>=20
> put online the new segments:
> [root@racclient1 ~]# for i in $(seq 88 103)
> > do
> > echo online > /sys/devices/system/memory/memory${i}/state
> > done
>=20
> Memory has been increased now, also from inside the OS.
>=20
> [root@racclient1 ~]# free
>               total        used        free      shared  buff/cache   =
available
> Mem:       12334428      222080    11934044        8480      178304    =
12019544
>=20
>=20
> NOTE: no new entries after online memory, neither in messages file nor =
in dmesg output.
>=20
> Questions:
> 1) which component to bugzilla against for message confusing window of =
the gui?

doesn=E2=80=99t matter much, ovirt-engine, frontend.

> 2) Initially I see that my VM (in webadmin gui) has 8Gb of defined =
memory AND 8Gb of "Physical Memory Guaranteed".
> After increasing memory, the second one remains the same and doesn't =
change even after shutdown / Power on.

> I think it could be an enhancement to ask the user if he/she wants to =
change it too, instead of manually go through=20
> Edit --> resource allocation --> memory allocation screen
> If seen as a agreed enhancement, which components to bugzilla against =
for RFE?

yeah, these are two separate fields. The suggestion sounds reasonable to =
me, Roy, thoughts on that?

> Gianluca

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 10 Dec 2015, at 13:16, Gianluca Cecchi <<a =
href=3D"mailto:gianluca.cecchi@gmail.com" =
class=3D"">gianluca.cecchi@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"gmail_extra"><div class=3D"gmail_quote">On Thu, =
Dec 10, 2015 at 12:24 PM, Michal Skrivanek <span dir=3D"ltr" =
class=3D""><<a href=3D"mailto:mskrivan@redhat.com" target=3D"_blank" =
class=3D"">mskrivan@redhat.com</a>></span> wrote:<br =
class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex"><span class=3D""><br class=3D""><br =
class=3D"">
><br class=3D"">
> Yes, CentOS 7.1 updated up to a couple of days ago.<br class=3D"">
<br class=3D"">
</span>Can you try 7.2? I don=E2=80=99t remember exactly but it may be =
that in earlier guests it=E2=80=99s not automatic. Check some tips for =
onlining memory explicitly<br class=3D"">
<br class=3D"">
5.2. How to online memory<br class=3D"">
 ------------<br class=3D"">
Even if the memory is hot-added, it is not at ready-to-use state.<br =
class=3D"">
For using newly added memory, you have to "online" the memory block.<br =
class=3D"">
<br class=3D"">
For onlining, you have to write "online" to the memory block's state =
file as:<br class=3D"">
<br class=3D"">
% echo online > /sys/devices/system/memory/memoryXXX/state<br =
class=3D"">
<div class=3D""><div class=3D"h5"><br =
class=3D""></div></div></blockquote><div class=3D""> </div></div><br =
class=3D""></div><div class=3D"gmail_extra">Hello,</div><div =
class=3D"gmail_extra">with your suggestions it worked as expected, =
without updating any packages in VM 7.1 guest (I seemed to remember that =
the forced online operation should not be necessary any =
more=E2=80=A6):</div></div></div></blockquote><div><br =
class=3D""></div>great!</div><div>with 7.2 it should be automatic. I =
think with Windows it works automatically as well.</div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
dir=3D"ltr" class=3D""><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">Starting state with 10Gb of =
ram inside the VM</div><div class=3D"gmail_extra"><div =
class=3D"gmail_extra">[root@racclient1 ~]# ll -d =
 /sys/devices/system/memory/memory* | wc -l</div><div =
class=3D"gmail_extra">80</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">slots defined:</div><div =
class=3D"gmail_extra">0 --> 23</div><div class=3D"gmail_extra">32 =
--> 87</div><div class=3D"gmail_extra"><br class=3D""></div><div =
class=3D"gmail_extra">Increase from web gui memory from 10240 to =
12288</div><div class=3D"gmail_extra"><br class=3D""></div><div =
class=3D"gmail_extra">I see this in messages as expected</div><div =
class=3D"gmail_extra"><br class=3D""></div><div class=3D"gmail_extra">Dec =
10 12:59:32 racclient1 kernel: init_memory_mapping: [mem =
0x2c0000000-0x33fffffff]</div><div class=3D"gmail_extra"><br =
class=3D""></div><div =
class=3D"gmail_extra">In /sys/devices/system/memory I see 16 new =
memoryxx directories (probably each one addressing 128Mb...)</div><div =
class=3D"gmail_extra"><br class=3D""></div><div =
class=3D"gmail_extra">88</div><div class=3D"gmail_extra">89</div><div =
class=3D"gmail_extra">90</div><div class=3D"gmail_extra">91</div><div =
class=3D"gmail_extra">92</div><div class=3D"gmail_extra">93</div><div =
class=3D"gmail_extra">94</div><div class=3D"gmail_extra">95</div><div =
class=3D"gmail_extra">96</div><div class=3D"gmail_extra">97</div><div =
class=3D"gmail_extra">98</div><div class=3D"gmail_extra">99</div><div =
class=3D"gmail_extra">100</div><div class=3D"gmail_extra">101</div><div =
class=3D"gmail_extra">102</div><div class=3D"gmail_extra">103</div><div =
class=3D"gmail_extra"><br class=3D""></div><div class=3D"gmail_extra">They=
 have indeed been added but are offline, eg</div><div =
class=3D"gmail_extra"><br class=3D""></div><div =
class=3D"gmail_extra">latest previous one:</div><div =
class=3D"gmail_extra">[root@racclient1 ~]# cat =
/sys/devices/system/memory/memory87/state </div><div =
class=3D"gmail_extra">online</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">first newly added =
one:</div><div class=3D"gmail_extra">[root@racclient1 ~]# cat =
/sys/devices/system/memory/memory88/state </div><div =
class=3D"gmail_extra">offline</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">[root@racclient1 ~]# cat =
/sys/devices/system/memory/memory87/online </div><div =
class=3D"gmail_extra">1</div><div class=3D"gmail_extra">[root@racclient1 =
~]# cat /sys/devices/system/memory/memory88/online </div><div =
class=3D"gmail_extra">0</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">put online the new =
segments:</div><div class=3D"gmail_extra">[root@racclient1 ~]# for i in =
$(seq 88 103)</div><div class=3D"gmail_extra">> do</div><div =
class=3D"gmail_extra">> echo online > =
/sys/devices/system/memory/memory${i}/state</div><div =
class=3D"gmail_extra">> done</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">Memory has been increased =
now, also from inside the OS.</div><div class=3D"gmail_extra"><br =
class=3D""></div><div class=3D"gmail_extra">[root@racclient1 ~]# =
free</div><div class=3D"gmail_extra">          =
    total        used       =
 free      shared  buff/cache   =
available</div><div class=3D"gmail_extra">Mem:       =
12334428      222080    11934044     =
   8480      178304   =
 12019544</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">NOTE: no new entries =
after online memory, neither in messages file nor in dmesg =
output.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Questions:</div><div class=3D"">1) which component to =
bugzilla against for message confusing window of the =
gui?</div></div></div></div></blockquote><div><br =
class=3D""></div>doesn=E2=80=99t matter much, ovirt-engine, =
frontend.</div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"gmail_extra"><div class=3D"">2) Initially I see that my VM (in =
webadmin gui) has 8Gb of defined memory AND 8Gb of "Physical Memory =
Guaranteed".</div><div class=3D"">After increasing memory, the second =
one remains the same and doesn't change even after shutdown / Power =
on.</div></div></div></div></blockquote></div><div><blockquote =
type=3D"cite" class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"gmail_extra"><div class=3D"">I think it could be an enhancement =
to ask the user if he/she wants to change it too, instead of manually go =
through </div><div class=3D"">Edit --> resource allocation =
--> memory allocation screen</div><div class=3D"">If seen as a agreed =
enhancement, which components to bugzilla against for =
RFE?</div></div></div></div></blockquote><div><br =
class=3D""></div><div>yeah, these are two separate fields. The =
suggestion sounds reasonable to me, Roy, thoughts on that?</div><div =
class=3D""><br class=3D""></div><blockquote type=3D"cite" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D"gmail_extra"><div =
class=3D"">Gianluca</div></div></div>
</div></blockquote></div><br class=3D""></body></html>=

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Nathanaël Blanchet

Yaniv Dary

Michal Skrivanek

Nathanaël Blanchet

Michal Skrivanek

Nathanaël Blanchet

Michal Skrivanek

Nathanaël Blanchet

Michal Skrivanek

Gianluca Cecchi

Sandro Bonazzola

Gianluca Cecchi

Michal Skrivanek

Gianluca Cecchi

Michal Skrivanek

Gianluca Cecchi

Michal Skrivanek

Gianluca Cecchi

Michal Skrivanek

Nathanaël Blanchet

Gianluca Cecchi

Nathanaël Blanchet

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