| 1 | /*
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| 2 | * Copyright (c) James Peach 2005-2006
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| 3 | *
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| 4 | * This program is free software; you can redistribute it and/or modify
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| 5 | * it under the terms of the GNU General Public License as published by
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| 6 | * the Free Software Foundation; either version 3 of the License, or
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| 7 | * (at your option) any later version.
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| 8 | *
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| 9 | * This program is distributed in the hope that it will be useful,
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | * GNU General Public License for more details.
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| 13 | *
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| 14 | * You should have received a copy of the GNU General Public License
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| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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| 16 | */
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| 17 |
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| 18 | #include "includes.h"
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| 19 | #include "smbd/smbd.h"
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| 20 |
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| 21 | /* Cache priming module.
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| 22 | *
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| 23 | * The purpose of this module is to do RAID stripe width reads to prime the
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| 24 | * buffer cache to do zero-copy I/O for subsequent sendfile calls. The idea is
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| 25 | * to do a single large read at the start of the file to make sure that most or
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| 26 | * all of the file is pulled into the buffer cache. Subsequent I/Os have
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| 27 | * reduced latency.
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| 28 | *
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| 29 | * Tunables.
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| 30 | *
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| 31 | * cacheprime:rsize Amount of readahead in bytes. This should be a
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| 32 | * multiple of the RAID stripe width.
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