numam-spdk

History

Shuhei Matsumoto 9c8941f973 test/nvme: Improve error check of input parsing by spdk_strtol Change-Id: I7ad159f7e7033e0249779a39faed92f94857aae7 Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Reviewed-on: https://review.gerrithub.io/c/441642 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com> Reviewed-by: wuzhouhui <wuzhouhui@kingsoft.com>		2019-01-29 17:39:18 +00:00
..
.gitignore	test: move lib/nvme up one directory	2018-03-27 00:46:52 -04:00
Makefile	mk: Add all external libs to sys_libs	2018-09-14 22:56:46 +00:00
overhead.c	test/nvme: Improve error check of input parsing by spdk_strtol	2019-01-29 17:39:18 +00:00
README	test: move lib/nvme up one directory	2018-03-27 00:46:52 -04:00

README

This application measures the software overhead of I/O submission
and completion for both the SPDK NVMe driver and an AIO file handle.
It runs a random read, queue depth = 1 workload to a single device,
and captures TSC as follows:

* Submission: capture TSC before and after the I/O submission
  call (SPDK or AIO).
* Completion: capture TSC before and after the I/O completion
  check.  Only record the TSC delta if the I/O completion check
  resulted in a completed I/O.  Also use heuristics in the AIO
  case to account for time spent in interrupt handling outside
  of the actual I/O completion check.

Usage:

To test software overhead for a 4KB I/O over a 10 second period:

SPDK:  overhead -s 4096 -t 10
AIO:   overhead -s 4096 -t 10 /dev/nvme0n1

Note that for the SPDK case, it will only use the first namespace
on the first controller found by SPDK.  If a different namespace is
desired, attach controllers individually to the kernel NVMe driver
to ensure they will not be enumerated by SPDK.