Re: Approaches to making io_submit not block

Christoph Hellwig
2011-09-02T13:11:09Z

On Fri, Sep 02, 2011 at 09:08:35AM -0400, Ted Ts'o wrote:
> That may be true for hard drives, but PCIe attached flash can support
> millions of IOP's per second --- i.e., at least hundreds of IOP's in
> milliseconds. Yes, these devices are expensive, but so are the
> thousand-disk RAID arrays that some people attach via XFS. :-)

reading / writing to the devices is different from allocator calls.

You reall do not want to do an allocator call for each of these device.