Hi On Wed, Feb 28, 2018 at 4:48 PM, Michael S. Tsirkin <[email protected]> wrote: > On Wed, Feb 28, 2018 at 04:41:51PM +0100, Marc-André Lureau wrote: >> I don't know if it's always safe to enable dma in read_raw(), how >> could we know? Is there a check we could use to choose one or ther >> other (and thus avoiding explicit dma/readfn argument)? > > I'm not sure - but does it really matter? Is anyone reading large files > like this in production where speed matters? > Why even bother with DMA?
The difference is quite significante for not so small files, as shown above. And if they access the fw_cfg entries at boot time, or when starting things etc, this may speed things up.
