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...s how it used to be in nbdkit <= 1.5.8: read: IOPS=133k, BW=518MiB/s (544MB/s)(60.7GiB/120002msec) write: IOPS=133k, BW=518MiB/s (543MB/s)(60.7GiB/120002msec) (4) I ran fio directly against /dev/shm to get some idea of how much performance we are losing by using NBD at all: read: IOPS=1018k, BW=3978MiB/s (4171MB/s)(466GiB/120001msec) write: IOPS=1018k, BW=3979MiB/s (4172MB/s)(466GiB/120001msec) Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for...

On Fri, Jan 04, 2019 at 05:26:07PM -0600, Eric Blake wrote: > On 1/4/19 4:08 PM, Richard W.M. Jones wrote: > > First thing to say is that I need to do a *lot* more testing on this, > > so this is just an early peek. In particular, although it passed > > ‘make check && make check-valgrind’ I have *not* tested it against a > > multi-conn-aware client such as the

For existing commits, this is almost identical to v1, except that I updated some commit messages and reordered the commits in a somewhat more logical sequence. The main changes are the extra commits: [06/11] plugins: Return NBD_FLAG_CAN_MULTI_CONN from some readonly plugins. - Readonly plugins that can set the flag unconditionally. [09/11] partitioning: Return NBD_FLAG_CAN_MULTI_CONN. [10/11]