From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 54271] readahead() docs incorrectly say it blocks
Date: Mon, 25 Feb 2013 20:55:17 +0000 (UTC)
Message-ID: <20130225205517.B759C11FC85@bugzilla.kernel.org>
References: <bug-54271-11311@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=54271





--- Comment #3 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2013-02-25 20:55:17 ---
So, I'm no expert here, but on my system (ext4), reading a 1 GB file (with
large userspace buffers) takes about 12 seconds. Doing a readahead() of a 1GB
file also takes about 12 seconds. If I'm understanding what you are saying
correctly, the readahead() should return much faster than the file-read case.
What am I missing?

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