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author: Jelmer Vernooij <jelmer@samba.org> 2003-08-13 06:07:10 +0000
committer: Jelmer Vernooij <jelmer@samba.org> 2003-08-13 06:07:10 +0000
commit: f62eaeb1a5add34ee7353d0d95db3c84a5c71c22 (patch)
tree: 10cf7e89e5a1ec800b7f30f731cbd4f4ebf5f13d /docs/htmldocs/speed.html
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 39. Samba Performance Tuning</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.60.1"><link rel="home" href="index.html" title="SAMBA Project Documentation"><link rel="up" href="Appendixes.html" title="Part VI. Appendixes"><link rel="previous" href="Other-Clients.html" title="Chapter 38. Samba and other CIFS clients"><link rel="next" href="DNSDHCP.html" title="Chapter 40. DNS and DHCP Configuration Guide"></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 39. 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. Appendixes</th><td width="20%" align="right"> <a accesskey="n" href="DNSDHCP.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="speed"></a>Chapter 39. 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><tt class="email">&lt;<a href="mailto:paulc@dth.scot.nhs.uk">paulc@dth.scot.nhs.uk</a>&gt;</tt></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><tt class="email">&lt;<a href="mailto:jelmer@samba.org">jelmer@samba.org</a>&gt;</tt></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><tt class="email">&lt;<a href="mailto:jht@samba.org">jht@samba.org</a>&gt;</tt></p></div></div></div></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="speed.html#id3016725">Comparisons</a></dt><dt><a href="speed.html#id3014565">Socket options</a></dt><dt><a href="speed.html#id3014636">Read size</a></dt><dt><a href="speed.html#id3014680">Max xmit</a></dt><dt><a href="speed.html#id3014732">Log level</a></dt><dt><a href="speed.html#id3014755">Read raw</a></dt><dt><a href="speed.html#id3014811">Write raw</a></dt><dt><a href="speed.html#id3014853">Slow Logins</a></dt><dt><a href="speed.html#id3015761">Client tuning</a></dt><dt><a href="speed.html#id3015784">Samba performance problem due changing kernel</a></dt><dt><a href="speed.html#id3015817">Corrupt tdb Files</a></dt></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3016725"></a>Comparisons</h2></div></div><div></div></div><p>
-The Samba server uses TCP to talk to the client. Thus if you are
-trying to see if it performs well you should really compare it to
-programs that use the same protocol. The most readily available
-programs for file transfer that use TCP are ftp or another TCP based
-SMB server.
-</p><p>
-If you want to test against something like a NT or WfWg server then
-you will have to disable all but TCP on either the client or
-server. Otherwise you may well be using a totally different protocol
-(such as NetBEUI) and comparisons may not be valid.
-</p><p>
-Generally you should find that Samba performs similarly to ftp at raw
-transfer speed. It should perform quite a bit faster than NFS,
-although this very much depends on your system.
-</p><p>
-Several people have done comparisons between Samba and Novell, NFS or
-WinNT. In some cases Samba performed the best, in others the worst. I
-suspect the biggest factor is not Samba vs some other system but the
-hardware and drivers used on the various systems. Given similar
-hardware Samba should certainly be competitive in speed with other
-systems.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014565"></a>Socket options</h2></div></div><div></div></div><p>
-There are a number of socket options that can greatly affect the
-performance of a TCP based server like Samba.
-</p><p>
-The socket options that Samba uses are settable both on the command
-line with the <tt class="option">-O</tt> option, or in the <tt class="filename">smb.conf</tt> file.
-</p><p>
-The <i class="parameter"><tt>socket options</tt></i> section of the <tt class="filename">smb.conf</tt> manual page describes how
-to set these and gives recommendations.
-</p><p>
-Getting the socket options right can make a big difference to your
-performance, but getting them wrong can degrade it by just as
-much. The correct settings are very dependent on your local network.
-</p><p>
-The socket option TCP_NODELAY is the one that seems to make the
-biggest single difference for most networks. Many people report that
-adding <i class="parameter"><tt>socket options = TCP_NODELAY</tt></i> doubles the read 
-performance of a Samba drive. The best explanation I have seen for this is
-that the Microsoft TCP/IP stack is slow in sending tcp ACKs.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014636"></a>Read size</h2></div></div><div></div></div><p>
-The option <i class="parameter"><tt>read size</tt></i> affects the overlap of disk
-reads/writes with network reads/writes. If the amount of data being
-transferred in several of the SMB commands (currently SMBwrite, SMBwriteX and
-SMBreadbraw) is larger than this value then the server begins writing
-the data before it has received the whole packet from the network, or
-in the case of SMBreadbraw, it begins writing to the network before
-all the data has been read from disk.
-</p><p>
-This overlapping works best when the speeds of disk and network access
-are similar, having very little effect when the speed of one is much
-greater than the other.
-</p><p>
-The default value is 16384, but very little experimentation has been
-done yet to determine the optimal value, and it is likely that the best
-value will vary greatly between systems anyway. A value over 65536 is
-pointless and will cause you to allocate memory unnecessarily.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014680"></a>Max xmit</h2></div></div><div></div></div><p>
-At startup the client and server negotiate a <i class="parameter"><tt>maximum transmit</tt></i> size,
-which limits the size of nearly all SMB commands. You can set the
-maximum size that Samba will negotiate using the <i class="parameter"><tt>max xmit = </tt></i> option
-in <tt class="filename">smb.conf</tt>. Note that this is the maximum size of SMB requests that 
-Samba will accept, but not the maximum size that the *client* will accept.
-The client maximum receive size is sent to Samba by the client and Samba
-honours this limit.
-</p><p>
-It defaults to 65536 bytes (the maximum), but it is possible that some
-clients may perform better with a smaller transmit unit. Trying values
-of less than 2048 is likely to cause severe problems.
-</p><p>
-In most cases the default is the best option.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014732"></a>Log level</h2></div></div><div></div></div><p>
-If you set the log level (also known as <i class="parameter"><tt>debug level</tt></i>) higher than 2
-then you may suffer a large drop in performance. This is because the
-server flushes the log file after each operation, which can be very
-expensive. 
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014755"></a>Read raw</h2></div></div><div></div></div><p>
-The <i class="parameter"><tt>read raw</tt></i> operation is designed to be an optimised, low-latency
-file read operation. A server may choose to not support it,
-however. and Samba makes support for <i class="parameter"><tt>read raw</tt></i> optional, with it
-being enabled by default.
-</p><p>
-In some cases clients don't handle <i class="parameter"><tt>read raw</tt></i> very well and actually
-get lower performance using it than they get using the conventional
-read operations. 
-</p><p>
-So you might like to try <i class="parameter"><tt>read raw = no</tt></i> and see what happens on your
-network. It might lower, raise or not affect your performance. Only
-testing can really tell.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014811"></a>Write raw</h2></div></div><div></div></div><p>
-The <i class="parameter"><tt>write raw</tt></i> operation is designed to be an optimised, low-latency
-file write operation. A server may choose to not support it,
-however. and Samba makes support for <i class="parameter"><tt>write raw</tt></i> optional, with it
-being enabled by default.
-</p><p>
-Some machines may find <i class="parameter"><tt>write raw</tt></i> slower than normal write, in which
-case you may wish to change this option.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3014853"></a>Slow Logins</h2></div></div><div></div></div><p>
-Slow logins are almost always due to the password checking time. Using
-the lowest practical <i class="parameter"><tt>password level</tt></i> will improve things. 
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3015761"></a>Client tuning</h2></div></div><div></div></div><p>
-Often a speed problem can be traced to the client. The client (for
-example Windows for Workgroups) can often be tuned for better TCP
-performance. Check the sections on the various clients in 
-<a href="Other-Clients.html" title="Chapter 38. Samba and other CIFS clients">Samba and Other Clients</a>.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3015784"></a>Samba performance problem due changing kernel</h2></div></div><div></div></div><p>
-Hi everyone. I am running Gentoo on my server and samba 2.2.8a. Recently
-I changed kernel version from linux-2.4.19-gentoo-r10 to
-linux-2.4.20-wolk4.0s. And now I have performance issue with samba. Ok
-many of you will probably say that move to vanilla sources...well I tried
-it too and it didn't work. I have 100mb LAN and two computers (linux +
-Windows2000). Linux server shares directory with DivX files, client
-(windows2000) plays them via LAN. Before when I was running 2.4.19 kernel
-everything was fine, but now movies freezes and stops...I tried moving
-files between server and Windows and it's terribly slow.
-</p><p>
-Grab mii-tool and check the duplex settings on the NIC.
-My guess is that it is a link layer issue, not an application
-layer problem.  Also run ifconfig and verify that the framing
-error, collisions, etc... look normal for ethernet.
-</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3015817"></a>Corrupt tdb Files</h2></div></div><div></div></div><p>
-Well today it happened, Our first major problem using samba.
-Our samba PDC server has been hosting 3 TB of data to our 500+ users
-[Windows NT/XP]  for the last 3 years using samba, no problem.
-But today all shares went SLOW; very slow. Also the main smbd kept
-spawning new processes so we had 1600+ running smbd's (normally we avg. 250).
-It crashed the SUN E3500 cluster twice. After a lot of searching I
-decided to <b class="command">rm /var/locks/*.tdb</b>. Happy again.
-</p><p>
-Q1) Is there any method of keeping the *.tdb files in top condition or
-how to early detect corruption?
-</p><p>
-A1) Yes, run <b class="command">tdbbackup</b> each time after stopping nmbd and before starting nmbd.
-</p><p>
-Q2) What I also would like to mention is that the service latency seems
-a lot lower then before the locks cleanup, any ideas on keeping it top notch?
-</p><p>
-A2) Yes! Same answer as for Q1!
-</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Other-Clients.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Appendixes.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="DNSDHCP.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 38. Samba and other CIFS clients </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 40. DNS and DHCP Configuration Guide</td></tr></table></div></body></html>
author	Jelmer Vernooij <jelmer@samba.org>	2003-08-13 06:07:10 +0000
committer	Jelmer Vernooij <jelmer@samba.org>	2003-08-13 06:07:10 +0000
commit	f62eaeb1a5add34ee7353d0d95db3c84a5c71c22 (patch)
tree	10cf7e89e5a1ec800b7f30f731cbd4f4ebf5f13d /docs/htmldocs/speed.html
parent	879573e127150d258bc7ad9526f273c9c846da99 (diff)
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