<p dir="ltr">Not really, Dual channel mode means you can read and write to both Banks of memory at the same time (aka Ganged). Single Channel means you treat all ram as a single bank reading and writing to one and then the other. think Raid 0 vs JBOD if that helps.</p>
<p dir="ltr">I personally have had 0 issue with greater than 4 GB of ram in a machine with Linux and a 64 bit kernel. and i have worked with multiple distributions over the years back and forth.</p>
<p dir="ltr">the main difference between Intel and AMD i have seen since the core i series CPUs were released is that AMD still has wicked fast memory performance but Intel wins most everything else. <br></p>
<p dir="ltr">If you have multiple processors you will want to look for numa. This allows inter processor communication for ram access. </p>
<p dir="ltr">It should not matter if you are running ganged or unchanged your is should see all ram installed with the exception of the PCI/pcie/chip set nibbling 100 to 700mb for doing its thing in consumer chipsets.<br>
</p>
<div class="gmail_quote">
On Mon, Jun 3, 2013 at 6:36 AM, keith smith <span dir="ltr"><<a href="mailto:klsmith2020@yahoo.com" target="_blank">klsmith2020@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit"><br>I found this in an on-line discussion:<br><br>Ganged = dual channel mode for ram. All cores get access to 100% of the ram.<br>
<br>
unganged = single channel. Each core gets access to a stick of ram.<br><br>Is this correct?<br><br><br>------------------------<br>
Keith Smith<br><br>--- On <b>Mon, 6/3/13, Nathan England <i><<a href="mailto:nathan@nmecs.com" target="_blank">nathan@nmecs.com</a>></i></b> wrote:<br><blockquote style="border-left:2px solid rgb(16,16,255);margin-left:5px;padding-left:5px">
<br>From: Nathan England <<a href="mailto:nathan@nmecs.com" target="_blank">nathan@nmecs.com</a>><br>Subject: Re: AMD vs Intel memory managemement<br>To: "Main PLUG discussion list" <<a href="mailto:plug-discuss@lists.phxlinux.org" target="_blank">plug-discuss@lists.phxlinux.org</a>><br>
Date: Monday, June 3, 2013, 1:35 AM<div><div><br><br><div>
<div>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><br><br></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Yeah, it's a wonderful thing AMD calls "unganged" mode. I have 8 GB of ram in my server and the motherboard has enabled "unganged" mode to be more efficient. CentOS only recognizes 5.8 GB of ram and I cannot turn off unganged mode.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">I love it...</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></sarcasm><br><br><br><br><br>On Sunday, June 02, 2013 17:46:19 keith smith wrote:<br></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<table style="margin-top:0px;margin-bottom:0px;margin-left:40px;margin-right:40px" border="0" cellpadding="0" cellspacing="0">
<tbody><tr>
<td style="vertical-align:top">
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><br>Hi,<br><br>After that great thread on 32bit vs 64bit, I was wondering if it would be beneficial at this point to drill down to the CPU level : AMD vs Intel.<br>
<br>We had a great thread a while ago the AMD CPU, however I do not think that thread covered memory management.<br><br>I almost went for an AMD CPU this go around (I have a couple from prior purchases), however after hearing that AMD does some weird memory management at the core level, assigning memory by the bank to each core, I thought I would go with an Intel CPU.<br>
<br>If I understand this correctly, It sounds like under some or most circumstances the server will lose a portion of the total memory because under AMD RAM is assigned at the core level and bank level. I assume Intel uses memory as a pool. Need memory just grab some until it is gone. <br>
<br>Any thoughts on
this?<br><br>Thanks!<br><br>------------------------<br>Keith Smith</p></td></tr></tbody></table>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><br><br></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">-- </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Regards,</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Nathan England</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</p>
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<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Nathan England (<a href="mailto:nathan@nmecs.com" target="_blank">nathan@nmecs.com</a>)</p>
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