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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 7/1/20 9:50 AM, Sagi Grimberg wrote: >>>> Hi, >>>> >>>> This is a small patch-series which replaces ctrl->namespaces with >>>> xarray for host-core and target-core. We can see following >>>> performance improvement when running fio with 32 parallel jobs where >>>> first 16 namespaces and last 16 namespaces are used for I/O. See [1] for >>>> detailed performance numbers. >>> Why would that make any difference given that we don't look up namespaces >>> in the I/O path? >> Not in host side. Target does a lookup on each IO through: >> >> nvmet_req_init() >> nvmet_parse_io_cmrd() >> nvmet_find_namespaces() >> >> And this detail should be mentioned in the test setup for the cover >> letter, or in patch 2. > Maybe ns scanning performance will improve:) > No it is not about scan only, (although it should as there is no sorting involve) this is for the passthru series which uses nvme_find_get_ns() in the fast path. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme