Date: Tue, 16 Nov 2010 15:53:44 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs zfs_vnops.c Message-ID: <201011161554.oAGFs3E6055058@repoman.freebsd.org>
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avg 2010-11-16 15:53:44 UTC
FreeBSD src repository
Modified files:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs zfs_vnops.c
Log:
SVN rev 215401 on 2010-11-16 15:53:44Z by avg
zfs+sendfile: populate all requested pages, not just those already cached
kern_sendfile() uses vm_rdwr() to read-ahead blocks of data to populate
page cache. When sendfile stumbles upon a page that is not populated
yet, it sends out all the mbufs that it collected so far. This
resulted in very poor performance with ZFS when file data is not in the
page cache, because ZFS vop_read for UIO_NOCOPY case populated only
those pages that are already in cache, but not valid. Which means that
most of the time it populated only the first requested page in the
described above scenario.
Reported by: Alexander Zagrebin <alexz@visp.ru>
Tested by: Alexander Zagrebin <alexz@visp.ru>,
Artemiev Igor <ai@kliksys.ru>
MFC after: 12 days
Revision Changes Path
1.85 +14 -4 src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
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