<html><body><p><font size="2">Checked with BMC people, they said It cannot be done in BMC. </font><br><font size="2"><br><br>Calvin Sze<br>OpenSystem Enablement/Optimization<br>email: calvins@us.ibm.com<br></font><br><br><img width="16" height="16" src="cid:1__=8FBB0B3BDFC4B43A8f9e8a93df938690918c8FB@" border="0" alt="Inactive hide details for "Jenifer Hopper" ---09/27/2017 10:18:36 AM---For FSP based systems you can go into the ASM and deconf"><font size="2" color="#424282">"Jenifer Hopper" ---09/27/2017 10:18:36 AM---For FSP based systems you can go into the ASM and deconfigure dimms (System Config -> HW Deconfig -></font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">"Jenifer Hopper" <jhopper@us.ibm.com></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">Brian Horton <brianh@linux.vnet.ibm.com></font><br><font size="2" color="#5F5F5F">Cc: </font><font size="2">linuxppc-users@lists.ozlabs.org</font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">09/27/2017 10:18 AM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">Re: [Linuxppc-users] memmap kernel option on ubuntu 16.04 power8</font><br><font size="2" color="#5F5F5F">Sent by: </font><font size="2">"Linuxppc-users" <linuxppc-users-bounces+calvins=us.ibm.com@lists.ozlabs.org></font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br><font size="2" face="Verdana">For FSP based systems you can go into the ASM and deconfigure dimms (System Config -> HW Deconfig -> Mem Deconfig), but I don't know of a way to do that for BMC based systems.<br><br>Thanks,<br>Jenifer Hopper<br>IBM Linux Technology Center, Linux Optimization</font><u><font size="2" color="#0000FF" face="Verdana"><br></font></u><a href="mailto:jhopper@us.ibm.com"><u><font size="2" color="#0000FF" face="Verdana">jhopper@us.ibm.com</font></u></a><font size="2" face="Verdana"><br>(512) 286-6701<br></font><font size="2" color="#990099"><br>-----"Linuxppc-users" <</font><a href="mailto:linuxppc-users-bounces+jhopper=us.ibm.com@lists.ozlabs.org" target="_blank"><u><font size="2" color="#0000FF">linuxppc-users-bounces+jhopper=us.ibm.com@lists.ozlabs.org</font></u></a><font size="2" color="#990099">> wrote: -----</font><br><font size="2">To: Michael Ellerman <</font><a href="mailto:mpe@ellerman.id.au" target="_blank"><u><font size="2" color="#0000FF">mpe@ellerman.id.au</font></u></a><font size="2">>, </font><a href="mailto:linuxppc-users@lists.ozlabs.org" target="_blank"><u><font size="2" color="#0000FF">linuxppc-users@lists.ozlabs.org</font></u></a><font size="2"><br>From: Brian Horton <br>Sent by: "Linuxppc-users" <br>Date: 09/27/2017 10:12AM<br>Subject: Re: [Linuxppc-users] memmap kernel option on ubuntu 16.04 power8<br></font><br><font size="2" face="Courier New"><br>On 09/27/2017 05:45 AM, Michael Ellerman wrote:<br>> Hi Brian,<br>> <br>> Brian Horton <</font><a href="mailto:brianh@linux.vnet.ibm.com" target="_blank"><u><font size="2" color="#0000FF" face="Courier New">brianh@linux.vnet.ibm.com</font></u></a><font size="2" face="Courier New">> writes:<br>>> Greetings all.<br>>><br>>> I'm trying to run some tests with less memory than what's installed. the<br>>> 'mem=128G' option works, but it ends up putting all of the memory on the<br>>> first numa node:<br>> <br>> It doesn't put memory anywhere, it just clamps the total memory, and it<br>> happens that the first (lowest address) 128G of RAM is all on node 0.<br><br>right, 'put' was a bad word choice. but yes, i see that the affect is <br>that the first 128G of RAM is used.<br><br><br>> <br>>> someone said that it worked on RHEL, so maybe it's an Ubuntu-specific bug..<br>> <br>> OK that would be interesting, but I suspect it's not true :)<br><br>correct, on 2nd look it was mis-information. they confirmed that it <br>doesn't work on RHEL either.<br><br>>> thoughts? ideas?<br>> <br>> AFAIK there's no way to achieve what you're after, without changing<br>> kernel code or creating a custom device tree.<br>> <br>> The mem= option is very primitive, it just clamps the total as I said<br>> above, it's not NUMA aware.<br>> <br>> What hardware/platform are you trying to do this on? Are you familiar<br>> with kexec?<br><br>P8, Tuleta and Firestone, baremetal, ppc64le w/ Ubuntu 16.04 HWE kernel.<br><br>No, I haven't looked into anything with kexec - what are my options with <br>that? I would prefer to stay away from building my own kernel code - <br>i'll probably just live with the testing that i'm doing if that's my <br>only option. i was just trying to be a little more 'realistic'.<br><br>Thanks! .bri.<br><br><br>> cheers<br>> <br><br>_______________________________________________<br>Linuxppc-users mailing list</font><u><font size="2" color="#0000FF" face="Courier New"><br></font></u><a href="mailto:Linuxppc-users@lists.ozlabs.org" target="_blank"><u><font size="2" color="#0000FF" face="Courier New">Linuxppc-users@lists.ozlabs.org</font></u></a><u><font size="2" color="#0000FF" face="Courier New"><br></font></u><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.ozlabs.org_listinfo_linuxppc-2Dusers&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=59cao60PiAeGQQaaFLkjnWW7CHr6qoRfN8NBRYVc9UQ&m=R9rn3U537CNoKLsBMZtzHp6VJc2mlnNdfmtsygTu4A0&s=o-r0sCpTTOrApxT7FVtnYCyWMpr9QjeO3pt0SW1yJm8&e="><u><font size="2" color="#0000FF" face="Courier New">https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.ozlabs.org_listinfo_linuxppc-2Dusers&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=59cao60PiAeGQQaaFLkjnWW7CHr6qoRfN8NBRYVc9UQ&m=R9rn3U537CNoKLsBMZtzHp6VJc2mlnNdfmtsygTu4A0&s=o-r0sCpTTOrApxT7FVtnYCyWMpr9QjeO3pt0SW1yJm8&e=</font></u></a><font size="2" face="Courier New"> <br></font><br><tt><font size="2">_______________________________________________<br>Linuxppc-users mailing list<br>Linuxppc-users@lists.ozlabs.org<br></font></tt><tt><font size="2"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.ozlabs.org_listinfo_linuxppc-2Dusers&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=XEmD5LeSMcW0pq1ccjREOfGKKSZEo6Uip7M_x_R-NUY&m=WNMxAOec1e_w34zBe3xVYIoJbJamikId375eNQw97IA&s=DGTWVG8bGGNjZ-cfXVvDyGfk8R4CJxIGw84m3Wi56Tk&e=">https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.ozlabs.org_listinfo_linuxppc-2Dusers&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=XEmD5LeSMcW0pq1ccjREOfGKKSZEo6Uip7M_x_R-NUY&m=WNMxAOec1e_w34zBe3xVYIoJbJamikId375eNQw97IA&s=DGTWVG8bGGNjZ-cfXVvDyGfk8R4CJxIGw84m3Wi56Tk&e=</a></font></tt><tt><font size="2"> <br></font></tt><br><br><BR>
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