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nbd: add multi-connection support
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NBD can become contended on its single connection.  We have to serialize all
writes and we can only process one read response at a time.  Fix this by
allowing userspace to provide multiple connections to a single nbd device.  This
coupled with block-mq drastically increases performance in multi-process cases.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Josef Bacik authored and Jens Axboe committed Nov 22, 2016
1 parent e00f4f4 commit 9561a7a
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