Date: Fri, 13 May 2011 10:21:01 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Jilles Tjoelker <jilles@stack.nl> Cc: freebsd-hackers@freebsd.org, Lev Serebryakov <lev@FreeBSD.org> Subject: Re: Does FreeBSD have replacement for posix_fadvice() or fcntl(F_RDADVISE)? Message-ID: <829202538.20110513102101@serebryakov.spb.ru> In-Reply-To: <20110512230327.GA82602@stack.nl> References: <1649118429.20110512113812@serebryakov.spb.ru> <20110512230327.GA82602@stack.nl>
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Hello, Jilles. You wrote 13 =EC=E0=FF 2011 =E3., 3:03:27: >> It is like madvise(2) but for file descriptors. > An effect like POSIX_FADV_SEQUENTIAL can be obtained with the > F_READAHEAD or F_RDAHEAD fcntl(2) requests. The implementation is > divided between the generic VFS layer and various filesystems (cd9660, > ext2fs, msdosfs, nfs, xfs and ufs appear to use the information to some > degree). Does read ahead turned on by default (for UFS), as here is vfs.read_max? Or vfs.read_max is only "upper bound" for F_READAHEAD and it is turned off by default completely? --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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