On Fri, Oct 29, 2010 at 05:41:59PM +0300, Andriy Gapon wrote: > What svn revision of FreeBSD source tree did you test?
r213936. Revision seems a little old. > Ah, I think I see what's going on. > Either sendfile should (have an option to) use VOP_GETPAGES to request data > or ZFS > mappedread should use vm_grab_page instead of vm_lookup_page for UIO_NOCOPY > case. > Currently ZFS would read a whole FS block into ARC, but populate only one page > with data and for the rest it would just wastefully do uiomove(UIO_NOCOPY) > from > ARC data. > So, e.g. zpool iostat would show that there are only few actual reads from a > pool. > The rest of the time must be spent churning over the data already in ARC and > doing page-per-VOP_READ copies from it. I can test it, but what allocflags? VM_ALLOC_RETRY|VM_ALLOC_NORMAL? _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
