Sagi Grimberg db5ad6b7f8
nvme-tcp: try to send request in queue_rq context ...
Today, nvme-tcp automatically schedules a send request
to a workqueue context, which is 1 more than we'd need
in case the socket buffer is wide open.
However, because we have async send activity (as a result
of r2t, or write_space callbacks), we need to synchronize
sends from possibly multiple contexts (ideally all running
on the same cpu though).
Thus, we only try to send directly from queue_rq in cases:
1. the send_list is empty
2. we can send it synchronously (i.e. not from the RX path)
3. we run on the same cpu as the queue->io_cpu to avoid
contention on the send operation.
Proposed-by: Mark Wunderlich <mark.wunderlich@intel.com >
Signed-off-by: Mark Wunderlich <mark.wunderlich@intel.com >
Signed-off-by: Sagi Grimberg <sagi@grimberg.me >
Signed-off-by: Christoph Hellwig <hch@lst.de >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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