Changeset 746 for vendor/current/docs/htmldocs/Samba3-HOWTO/speed.html
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r740 r746 1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 45. Samba Performance Tuning</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="Appendix.html" title="Part VI. Reference Section"><link rel="prev" href="Other-Clients.html" title="Chapter 44. Samba and Other CIFS Clients"><link rel="next" href="ch-ldap-tls.html" title="Chapter 46. LDAP and Transport Layer Security"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 45. Samba Performance Tuning</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Other-Clients.html">Prev</a> </td><th width="60%" align="center">Part VI. Reference Section</th><td width="20%" align="right"> <a accesskey="n" href="ch-ldap-tls.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 45. Samba Performance Tuning"><div class="titlepage"><div><div><h2 class="title"><a name="speed"></a>Chapter 45. Samba Performance Tuning</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Paul</span> <span class="surname">Cochrane</span></h3><div class="affiliation"><span class="orgname">Dundee Limb Fitting Centre<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:paulc@dth.scot.nhs.uk">paulc@dth.scot.nhs.uk</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jelmer</span> <span class="othername">R.</span> <span class="surname">Vernooij</span></h3><div class="affiliation"><span class="orgname">The Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jelmer@samba.org">jelmer@samba.org</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>></code></p></div></div></div></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="speed.html#id452214">Comparisons</a></span></dt><dt><span class="sect1"><a href="speed.html#id452243">Socket Options</a></span></dt><dt><span class="sect1"><a href="speed.html#id452328">Read Size</a></span></dt><dt><span class="sect1"><a href="speed.html#id45236 5">Max Xmit</a></span></dt><dt><span class="sect1"><a href="speed.html#id452406">Log Level</a></span></dt><dt><span class="sect1"><a href="speed.html#id452429">Read Raw</a></span></dt><dt><span class="sect1"><a href="speed.html#id452489">Write Raw</a></span></dt><dt><span class="sect1"><a href="speed.html#id452537">Slow Logins</a></span></dt><dt><span class="sect1"><a href="speed.html#id452559">Client Tuning</a></span></dt><dt><span class="sect1"><a href="speed.html#id452577">Samba Performance Problem Due to Changing Linux Kernel</a></span></dt><dt><span class="sect1"><a href="speed.html#id452660">Corrupt tdb Files</a></span></dt><dt><span class="sect1"><a href="speed.html#id452749">Samba Performance is Very Slow</a></span></dt></dl></div><div class="sect1" title="Comparisons"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452214"></a>Comparisons</h2></div></div></div><p>1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 45. Samba Performance Tuning</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="Appendix.html" title="Part VI. Reference Section"><link rel="prev" href="Other-Clients.html" title="Chapter 44. Samba and Other CIFS Clients"><link rel="next" href="ch-ldap-tls.html" title="Chapter 46. LDAP and Transport Layer Security"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 45. Samba Performance Tuning</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Other-Clients.html">Prev</a> </td><th width="60%" align="center">Part VI. Reference Section</th><td width="20%" align="right"> <a accesskey="n" href="ch-ldap-tls.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 45. Samba Performance Tuning"><div class="titlepage"><div><div><h2 class="title"><a name="speed"></a>Chapter 45. Samba Performance Tuning</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Paul</span> <span class="surname">Cochrane</span></h3><div class="affiliation"><span class="orgname">Dundee Limb Fitting Centre<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:paulc@dth.scot.nhs.uk">paulc@dth.scot.nhs.uk</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jelmer</span> <span class="othername">R.</span> <span class="surname">Vernooij</span></h3><div class="affiliation"><span class="orgname">The Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jelmer@samba.org">jelmer@samba.org</a>></code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email"><<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>></code></p></div></div></div></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="speed.html#id452214">Comparisons</a></span></dt><dt><span class="sect1"><a href="speed.html#id452243">Socket Options</a></span></dt><dt><span class="sect1"><a href="speed.html#id452328">Read Size</a></span></dt><dt><span class="sect1"><a href="speed.html#id452364">Max Xmit</a></span></dt><dt><span class="sect1"><a href="speed.html#id452406">Log Level</a></span></dt><dt><span class="sect1"><a href="speed.html#id452428">Read Raw</a></span></dt><dt><span class="sect1"><a href="speed.html#id452488">Write Raw</a></span></dt><dt><span class="sect1"><a href="speed.html#id452536">Slow Logins</a></span></dt><dt><span class="sect1"><a href="speed.html#id452558">Client Tuning</a></span></dt><dt><span class="sect1"><a href="speed.html#id452577">Samba Performance Problem Due to Changing Linux Kernel</a></span></dt><dt><span class="sect1"><a href="speed.html#id452660">Corrupt tdb Files</a></span></dt><dt><span class="sect1"><a href="speed.html#id452749">Samba Performance is Very Slow</a></span></dt></dl></div><div class="sect1" title="Comparisons"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452214"></a>Comparisons</h2></div></div></div><p> 2 2 The Samba server uses TCP to talk to the client, so if you are 3 3 trying to see if it performs well, you should really compare it to … … 62 62 value will vary greatly between systems anyway. A value over 65536 is 63 63 pointless and will cause you to allocate memory unnecessarily. 64 </p></div><div class="sect1" title="Max Xmit"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id45236 5"></a>Max Xmit</h2></div></div></div><p>64 </p></div><div class="sect1" title="Max Xmit"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452364"></a>Max Xmit</h2></div></div></div><p> 65 65 At startup the client and server negotiate a <em class="parameter"><code>maximum transmit</code></em> size, 66 66 which limits the size of nearly all SMB commands. You can set the … … 80 80 server flushes the log file after each operation, which can be quite 81 81 expensive. 82 </p></div><div class="sect1" title="Read Raw"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id45242 9"></a>Read Raw</h2></div></div></div><p>82 </p></div><div class="sect1" title="Read Raw"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452428"></a>Read Raw</h2></div></div></div><p> 83 83 The <a class="link" href="smb.conf.5.html#READRAW" target="_top">read raw</a> operation is designed to be an optimized, low-latency 84 84 file read operation. A server may choose to not support it, … … 91 91 network. It might lower, raise, or not affect your performance. Only 92 92 testing can really tell. 93 </p></div><div class="sect1" title="Write Raw"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id45248 9"></a>Write Raw</h2></div></div></div><p>93 </p></div><div class="sect1" title="Write Raw"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452488"></a>Write Raw</h2></div></div></div><p> 94 94 The <a class="link" href="smb.conf.5.html#WRITERAW" target="_top">write raw</a> operation is designed to be an optimized, low-latency 95 95 file write operation. A server may choose to not support it, however, and Samba makes support for … … 98 98 Some machines may find <a class="link" href="smb.conf.5.html#WRITERAW" target="_top">write raw</a> slower than normal write, in which 99 99 case you may wish to change this option. 100 </p></div><div class="sect1" title="Slow Logins"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id45253 7"></a>Slow Logins</h2></div></div></div><p>100 </p></div><div class="sect1" title="Slow Logins"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452536"></a>Slow Logins</h2></div></div></div><p> 101 101 Slow logins are almost always due to the password checking time. Using 102 102 the lowest practical <a class="link" href="smb.conf.5.html#PASSWORDLEVEL" target="_top">password level</a> will improve things. 103 </p></div><div class="sect1" title="Client Tuning"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id45255 9"></a>Client Tuning</h2></div></div></div><p>103 </p></div><div class="sect1" title="Client Tuning"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452558"></a>Client Tuning</h2></div></div></div><p> 104 104 Often a speed problem can be traced to the client. The client (for 105 105 example Windows for Workgroups) can often be tuned for better TCP … … 110 110 </p><div class="blockquote"><blockquote class="blockquote"><p> 111 111 <a class="indexterm" name="id452591"></a> 112 <a class="indexterm" name="id45259 8"></a>112 <a class="indexterm" name="id452597"></a> 113 113 I am running Gentoo on my server and Samba 2.2.8a. Recently I changed kernel versions from 114 114 <code class="filename">linux-2.4.19-gentoo-r10</code> to <code class="filename">linux-2.4.20-wolk4.0s</code>. Now I have a … … 123 123 <a class="indexterm" name="id452634"></a> 124 124 <a class="indexterm" name="id452641"></a> 125 <a class="indexterm" name="id45264 8"></a>125 <a class="indexterm" name="id452647"></a> 126 126 Grab the mii-tool and check the duplex settings on the NIC. My guess is that it is a link layer issue, not an 127 127 application layer problem. Also run ifconfig and verify that the framing error, collisions, and so on, look 128 128 normal for ethernet. 129 129 </p></blockquote></div></div><div class="sect1" title="Corrupt tdb Files"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452660"></a>Corrupt tdb Files</h2></div></div></div><p> 130 <a class="indexterm" name="id45266 8"></a>130 <a class="indexterm" name="id452667"></a> 131 131 <a class="indexterm" name="id452674"></a> 132 132 <a class="indexterm" name="id452681"></a> … … 140 140 </p><p> 141 141 <a class="indexterm" name="id452708"></a> 142 <a class="indexterm" name="id45271 5"></a>142 <a class="indexterm" name="id452714"></a> 143 143 <span class="emphasis"><em>Answer:</em></span> Yes, run <code class="literal">tdbbackup</code> each time after stopping nmbd and before starting nmbd. 144 144 </p><p> … … 148 148 <span class="emphasis"><em>Answer:</em></span> Yes. Same answer as for previous question! 149 149 </p></div><div class="sect1" title="Samba Performance is Very Slow"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id452749"></a>Samba Performance is Very Slow</h2></div></div></div><p> 150 <a class="indexterm" name="id45275 7"></a>150 <a class="indexterm" name="id452756"></a> 151 151 A site reported experiencing very baffling symptoms with MYOB Premier opening and 152 152 accessing its data files. Some operations on the file would take between 40 and … … 159 159 through with pauses of about 1 second. 160 160 </p><p> 161 <a class="indexterm" name="id45278 7"></a>162 <a class="indexterm" name="id45279 4"></a>161 <a class="indexterm" name="id452786"></a> 162 <a class="indexterm" name="id452793"></a> 163 163 Stopping the monitor software resulted in the networks access at normal 164 164 (quick) speed. Restarting the program caused the speed to slow down
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