1VFS_READAHEAD(8)                                              VFS_READAHEAD(8)
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NAME

6       vfs_readahead - pre-load the kernel buffer cache
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SYNOPSIS

9       vfs objects = readahead
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DESCRIPTION

12       This VFS module is part of the samba(7) suite.
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14       This  vfs_readahead  VFS module detects read requests at multiples of a
15       given offset (hex 0x80000 by default) and then  tells  the  kernel  via
16       either the readahead system call (on Linux) or the posix_fadvise system
17       call to pre-fetch this data into the buffer cache.
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19       This module is useful for Windows Vista clients reading data using  the
20       Windows  Explorer program, which asynchronously does multiple file read
21       requests at offset boundaries of 0x80000 bytes.
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23       The offset multiple used is given by the readahead:offset option, which
24       defaults to 0x80000.
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26       The  size  of  the  disk  read operations performed by vfs_readahead is
27       determined by the readahead:length option. By default this  is  set  to
28       the same value as the readahead:offset option and if not set explicitly
29       will use the current value of readahead:offset.
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31       This module is stackable.
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OPTIONS

34       readahead:offset = BYTES
35          The offset multiple that causes readahead to  be  requested  of  the
36          kernel buffer cache.
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38       readahead:length = BYTES
39          The  number  of  bytes  requested  to be read into the kernel buffer
40          cache on each readahead call.
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42       The following suffixes may be applied to BYTES:
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44       ·  K - BYTES is a number of kilobytes
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46       ·  M - BYTES is a number of megabytes
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48       ·  G - BYTES is a number of gigabytes
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EXAMPLES

51            [hypothetical]
52            vfs objects = readahead
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VERSION

56       This man page is correct for version 3.0.25 of the Samba suite.
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AUTHOR

59       The original Samba software  and  related  utilities  were  created  by
60       Andrew  Tridgell.  Samba  is now developed by the Samba Team as an Open
61       Source project similar to the way the Linux kernel is developed.
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66                                                              VFS_READAHEAD(8)
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