search for: nbd_cmd_resize

...servers (unsupported, either one of the two supported, or both supported), and where clients may make optimization choices based on any of those four combinations. [and if we're keeping score, other extension proposals that I want revisit, in no particular order, include: - 64-bit operations - NBD_CMD_RESIZE - more precision on TRIM/WRITE_ZERO alignment constraints ] -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org

...the two supported, or > both supported), and where clients may make optimization choices based > on any of those four combinations. > > [and if we're keeping score, other extension proposals that I want > revisit, in no particular order, include: > - 64-bit operations > - NBD_CMD_RESIZE > - more precision on TRIM/WRITE_ZERO alignment constraints > ] Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and b...

On Wed, Apr 11, 2018 at 12:03:42AM -0500, Eric Blake wrote: > Now that we have FUA support, the C code can call can_fua as > frequently as on every write. If the python script has a > can_fua, we can avoid doubling the calls into python by > caching the per-connection results, done by wrapping the > python handle in a C struct. > > This commit is marked RFC because it might

While it may be counterintuitive at first, the introduction of NBD_CMD_WRITE_ZEROES and NBD_CMD_BLOCK_STATUS has caused a performance regression in qemu [1], when copying a sparse file. When the destination file must contain the same contents as the source, but it is not known in advance whether the destination started life with all zero content, then there are cases where it is faster to request