<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<!-- saved from url=(0014)about:internet -->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Style-Type" content="text/css" />
    <meta name="GENERATOR" content="Quadralay WebWorks AutoMap 2003 Platinum Edition Client for FrameMaker 8.6.6597.0" />
    <meta name="TEMPLATEBASE" content="emwebh8-1-17" />
    <meta name="LASTUPDATED" content="08/01/13 14:48:38" />
    <title>Performance Buffers </title>
    <!-- Copyright 2010-2013, Cisco Systems, Inc. All rights reserved. -->

    <link rel="StyleSheet" href="document.css" type="text/css" />
    <link rel="StyleSheet" href="catalog.css" type="text/css" />


<script> 
    var is_chrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1; 
   
    if(is_chrome){document.domain=document.domain}
   </script>
    <script type="text/javascript" language="JavaScript1.2" src="expand.js"></script>
    <script type="text/javascript" language="JavaScript1.2" src="page.js"></script>

    <script type="text/javascript" language="JavaScript1.2">
     <!--
      function  WWNoOp() {}
      function  WWNoValue() { return ""; }

      var  VarDropDown;

      if (typeof(HTMLHelp_Object) != "undefined")
      {
        VarDropDown = new WWDropDown_Object();
      }
      else
      {
        VarDropDown = new Object();
        VarDropDown.fAnchorOpen  = WWNoOp;
        VarDropDown.fAnchorClose = WWNoOp;
        VarDropDown.fDIVOpen  = WWNoOp;
        VarDropDown.fDIVClose = WWNoOp;
      }
     // -->
    </script>

  
<SCRIPT language="javascript">
<!--
  self.document.write("<link href='"+top.relPath+"shared/style.css' rel='stylesheet' type='text/css'>");
  myid=2551;
  self.document.write("<script type='text/javascript' language='JavaScript' src='"+top.relPath+"shared/con_utils.js'></scr"+"ipt>");
//-->
</SCRIPT>
</head>

  <body onload="highlightSearchTerms();" bgcolor="#ffffff">

    
    <blockquote>
    <a name="top"></a>

    
    


<a name="wp1093864"> </a><h1 class="pTitle">
Performance Buffers

</h1>
<a name="wp1093865"> </a><p class="pBody">
Regardless of the configured receive BB_credit value, additional buffers, called performance buffers, 
improve switch port performance. Instead of relying on the built-in switch algorithm, you can manually 
configure the performance buffer value for specific applications (for example, forwarding frames over 
FCIP interfaces).

</p>
<a name="wp1072595"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Performance buffers are not supported on the Cisco MDS 9148 Fabric Switch, Cisco MDS 9124 Fabric 
Switch, the Cisco Fabric Switch for HP c-Class BladeSystem, and the Cisco Fabric Switch for IBM 
BladeCenter.

</p>
<a name="wp1072596"> </a><p class="pBody">
For each physical Fibre Channel interface in any switch in the Cisco MDS 9000 Family, you can specify 
the amount of performance buffers allocated in addition to the configured receive BB_credit value. 

</p>
<a name="wp1072597"> </a><p class="pBody">
The default performance buffer value is 0. If you set the performance buffer value to 0, the built-in 
algorithm is used. If you do not specify the performance buffer value, 0 is automatically used.

</p>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

    </blockquote>

  </body>
</html>
