On Thu, Oct 24, 2013 at 12:00:54PM +0100, Steven Hartland wrote:
> Not familiar with that option, but having a quick look in src
> it doesn't seem to be FS specific, seems to be handled by vfs.
VFS set options include this (in high bits).
This options next passed to FS code (.vop_read = zfs_freebsd_read), in
FS(zfs) code options filtered:
return (zfs_read(ap->a_vp, ap->a_uio, ioflags(ap->a_ioflag),
ap->a_cred, NULL));
ioflags(int ioflags)
{
int flags = 0;
if (ioflags & IO_APPEND)
flags |= FAPPEND;
if (ioflags & IO_NDELAY)
flags |= FNONBLOCK;
if (ioflags & IO_SYNC)
flags |= (FSYNC | FDSYNC | FRSYNC);
return (flags);
}
and we lost FRDAHEAD/ADVISE hints, IO_DIRECT, IO_INVAL and so.
> Can anyone confirm or deny this?
>
> ----- Original Message -----
> From: "Slawa Olhovchenkov" <s...@zxy.spb.ru>
>
>
> > On Wed, Oct 23, 2013 at 09:54:59AM +0000, Steven Hartland wrote:
> >
> >> Author: smh
> >> Date: Wed Oct 23 09:54:58 2013
> >> New Revision: 256956
> >> URL: http://svnweb.freebsd.org/changeset/base/256956
> >>
> >> Log:
> >> Improve ZFS N-way mirror read performance by using load and locality
> >> information.
> >
> > What about support F_READAHEAD in ZFS (with prefetch disabled by
> > CPU-intensive)?
> >
>
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