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Server Tuning |
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Table of Contents |
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Max Connections |  |
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Description: Specifies the maximum concurrent connections that the server can accept.
It includes both plain TCP connections and SSL connections. It should not exceed
the hard limit set by the server: 400 for Standard Edition, 2048 for Professional Edition;
otherwise the hard limit is used. Once this limit is reached, the server will close current
Keep-Alive connection when it finishes processing current request.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: Increase the per process file descriptor limit if needed. See corresponding HOWTO. |
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Max SSL Connections |  |
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Description: Specifies the maximum concurrent SSL connections that the server will accept.
Since total concurrent SSL and non-SSL connections will not exceed the limit specified by
Max Connections, so the actual number of concurrent SSL connections allowed
could be lower than this limit.
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Syntax: Integer number |
Apply: On the fly with reload. |
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Connection Timeout |  |
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Description: Specifies the maximum allowed connection idle time during processing one request.
The connection will be closed whenever it is idle with no I/O activities for this period
of time.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Security] Set it as low and reasonable as you can, it helps recover dead
connections during possible DoS attack. |
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Max Keep-Alive Requests |  |
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Description: Specifies the maximum requests that can be served through a Keep-Alive (Persistent)
connection. Connection will be closed once this limit is reached.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Performance] Set it as high and reasonable as you can, set it <= 1 will disable Keep-Alive. |
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Keep-Alive Timeout |  |
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Description: Specifies the maximum idle time between requests from a Keep-Alive connection.
If no new request received during this period of time, the connection will be closed.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Security & Performance] Set it properly that will keep connections alive for
most requests and at same time will guard against DoS attack. 15-30 seconds is a
reasonable range for most application. |
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Send Buffer Size |  |
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Description: The sending buffer size of TCP socket. Set to 0 to use the default
buffer size of the operating system. 65535 is the maximum allowed buffer size.
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Syntax: Integer number |
Apply: Restart required. |
Tips: [Performance] If your web site serves some big files, increase the send buffer
size will improve the performance. |
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Receive Buffer Size |  |
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Description: The receiving buffer size of TCP socket. Set to 0 to use the default
buffer size. 65535 is the hard limit.
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Syntax: Integer number |
Apply: Restart required. |
Tips: [Performance] A bigger receiving buffer will increase performance when processing
requests with big request body (e.g. to upload a big file). |
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Max Request URL Length |  |
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Description: Specifies the maximum size of a request URL. URL is an address used to access
one web page, including query string. 8192 bytes is the hard limit.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Security & Performance] Set it low and reasonable to reduce memory usage
and help identify bad request and DoS attack. 2-3K is big enough for most web
sites unless HTTP GET is used as big query string instead of POST. |
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Max Request Header Size |  |
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Description: Specifies the maximum size of a HTTP request header including request URL.
Hard limit is 16380 bytes.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Security & Performance] Set it low and reasonable to reduce memory usage and
help identify bad request and DoS attack. 4-8K is big enough for most web sites. |
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Max Request Body Size |  |
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Description: Specifies the maximum size of a HTTP request body. 1GB is the hard limit.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Security] Set the limit just a little higher than what is really needed to
help identify DoS attack. Your swapping space should be big enough. |
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Max Dynamic Response Header Size |  |
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Description: Specifies the maximum header size of a dynamically generated response. Hard limit is 8KB
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Reliability & Performance] Set it low and reasonable to help recognize bad
responses that are dynamically generated by external applications. |
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Max Dynamic Response Body Size |  |
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Description: Specifies the maximum body size of a dynamically generated response. Hard limit is 1GB.
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Syntax: Integer number |
Apply: On the fly with reload. |
Tips: [Reliability & Performance] set the limit low and reasonable to help
identify bad responses. For e.g., it is pretty often to find a bad script with dead
loop which will generate infinite response. |
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Enable Compression |  |
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Description: Controls GZIP compression for both static and dynamic HTTP response.
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Syntax: Select from radio box |
Apply: On the fly with reload. |
Tips: [Performance] Enable it to save network bandwidth. |
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Enable Dynamic Compression |  |
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Description: Controls GZIP compression for dynamically generated HTTP response.
Enable Compression must be set to "true" in order to enable dynamic GZIP compression.
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Syntax: Select from radio box |
Apply: On the fly with reload. |
Tips: [Performance] Compressing dynamic responses increases CPU and memory
utilization but saves network bandwidth. |
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Compression Level (Dynamic Content) |  |
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Description: Specifies the level of compression for dynamic contents, ranges
from 1 (lowest) to 9 (highest), default is 2.
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Syntax: Number between 1 and 9. |
Apply: On the fly with reload. |
Tips: [Performance] Higher compression level will use more memory and CPU cycles.
You can set it to a higher level if your machine has additional power. |
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Compressible Types |  |
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Description: Specifies what MIME types are allowed to be compressed. For example,
you may want to compress text/* but not text/css, you can have a rule like
text/*, !text/css. "!" will exclude that mime type.
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Syntax: MIME type list separated by commas. allow wild card "*" and
negate sign "!". Examples: text/*, !text/js. |
Apply: On the fly with reload. |
Tips: [Performance] Only allow types that will benefit from compression. |
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Auto Update Static File |  |
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Description: Specifies whether to let the web server to create/update GZIP
compressed edition of compressible static files.
If set to "Yes", when a file with MIME
type listed in "Compressible Type" is requested, the web server will
create or update the corresponding compressed file if it does not
exist or outdated. The compressed file
is created under the same directory with original file name plus the
trailing suffix ".gz".
Please make sure the directory is writeable by the user that the web
server running as.
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Syntax: Select from radio box |
Apply: On the fly with reload. |
Tips: [Performance] It is recommended to create the initial compressed
files manually for a large site with tons of static files. |
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Compression Level (Static Content) |  |
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Description: Specifies the level of compression for static contents, ranges
from 1 (lowest) to 9 (highest), default is 6.
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Syntax: Number between 1 and 9. |
Apply: On the fly with reload. |
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Max Static File Size |  |
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Description: Specifies the maximum size of a static file for which the web server
will create a compressed file automatically.
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Syntax: Number in bytes not less than 1K |
Apply: On the fly with reload. |
Tips: [Performance] It is not recommended to have web server create/update
compressed file for large files, as the whole web service
is blocked during that period, no request can be processed before the
compression is done. |
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Min Static File Size |  |
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Description: Specifies the minimum size of a static file for which the web server
will create a corresponding compressed file.
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Syntax: Number in bytes not less than 200 |
Apply: On the fly with reload. |
Tips: It is not necessory to compress very small file, as the save in
bandwidth is negligible. |
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Copyright © 2003. Lite Speed Technologies Inc. All rights reserved. |