b99b00e595
To achieve the highest possible IO-rates and lowest latency, then CPU cycles must be spent processing IO. This commit introduces three different techniques dependendent on the 'io_mechanism' used. For 'libaio', xNVMe is instructued via 'opts.poll_io' to not wait for completions, thus xnvme_queue_poke() returns immmediatly, the user can then call xnvme_queue_poke() as frequently as desired. This requires xNVMe v0.5.0. Earlier versions will ignore 'opts.poll_io' for 'libaio'. For 'io_uring', xNVMe is instructed via 'opts.poll_io' to enable IORING_SETUP_IOPOLL. For 'io_uring_cmd', xNVMe is instructued via 'opts.poll_sq' to enable IORING_SETUP_SQPOLL, this sets up a kernel-side thread reaping completions from user-space on the ring. Note that 'io_uring_cmd' requires liburing >= 2.2. This commit enables the above by default. The above can be disabled by setting 'conserve_cpu' to true on the bdev-setup. Signed-off-by: Simon A. F. Lund <simon.lund@samsung.com> Change-Id: Id54f1e59733ce9ae3b174ad4562904d868d4ef4f Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14678 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
24 lines
614 B
C
24 lines
614 B
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (c) Samsung Electronics Co., Ltd.
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* All rights reserved.
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*/
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#ifndef SPDK_BDEV_XNVME_H
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#define SPDK_BDEV_XNVME_H
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#include "spdk/stdinc.h"
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#include "spdk/queue.h"
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#include "spdk/bdev.h"
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#include "spdk/bdev_module.h"
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typedef void (*spdk_delete_xnvme_complete)(void *cb_arg, int bdeverrno);
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struct spdk_bdev *create_xnvme_bdev(const char *name, const char *filename,
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const char *io_mechanism, bool conserve_cpu);
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void delete_xnvme_bdev(struct spdk_bdev *bdev, spdk_delete_xnvme_complete cb_fn, void *cb_arg);
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#endif /* SPDK_BDEV_XNVME_H */
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