On Sun, Sep 09, 2018 at 10:15:20AM -0000, Michael van Elst wrote: > I'm about to commit a change that uses mnt_stat.f_iosize instead. For > backing store on FFS that at least allows the faster method for virtual > disks with sectors of at least the fragment size, and I don't think we > can safely do smaller I/O.
I strongly dissagree. I have 512-byte-sectors domUs running for years on a dom0 with 64k blocks/8k fragements. This works ! I'm I'm probably not the only one, as this has been this way since we have dom0 support. It's very unlikely that others have requested a 512-byte fragments FFS for their domUs backing store. The performance penaltly of VOP_READ/VOP_WRITE is just inacceptable for a Xen setup. -- Manuel Bouyer <[email protected]> NetBSD: 26 ans d'experience feront toujours la difference --
