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VFS_READAHEAD(8) System Administration tools VFS_READAHEAD(8) NAME vfs_readahead - pre-load the kernel buffer cache SYNOPSIS vfs objects = readahead DESCRIPTION This VFS module is part of the samba(7) suite. This vfs_readahead VFS module detects read requests at multiples of a given offset (hex 0x80000 by default) and then tells the kernel via either the readahead system call (on Linux) or the posix_fadvise system call to pre-fetch this data into the buffer cache. This module is useful for Windows Vista clients reading data using the Win- dows Explorer program, which asynchronously does multiple file read re- quests at offset boundaries of 0x80000 bytes. The offset multiple used is given by the readahead:offset option, which de- faults to 0x80000. The size of the disk read operations performed by vfs_readahead is deter- mined by the readahead:length option. By default this is set to the same value as the readahead:offset option and if not set explicitly will use the current value of readahead:offset. This module is stackable. OPTIONS readahead:offset = BYTES The offset multiple that causes readahead to be requested of the kernel buffer cache. readahead:length = BYTES The number of bytes requested to be read into the kernel buffer cache on each readahead call. The following suffixes may be applied to BYTES: * K - BYTES is a number of kilobytes * M - BYTES is a number of megabytes * G - BYTES is a number of gigabytes EXAMPLES [hypothetical] vfs objects = readahead VERSION This man page is part of version 4.23.8 of the Samba suite. AUTHOR The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed. Samba 4.23.8 08/01/2026 VFS_READAHEAD(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | VERSION | AUTHOR
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