On Tue, 7 Jul 2009, Joerg Schilling wrote:
posix_fadvise seems to be _very_ new for Solaris and even though I am frequently reading/writing the POSIX standards mailing list, I was not aware of it. From my tests with star, I cannot see a significant performance increase but it may have a 3% effect........
Based on the prior discussions of using mmap() with ZFS and the way ZFS likes to work, my guess is that POSIX_FADV_NOREUSE does nothing at all and POSIX_FADV_DONTNEED probably does not work either. These are pretty straightforward to implement with UFS since UFS benefits from the existing working madvise() functionality.
ZFS seems to want to cache all read data in the ARC, period. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
