Messages in this thread | | | From | Chaitanya Kulkarni <> | Subject | Re: NVME performance regression in Linux 5.x due to lack of block level IO queueing | Date | Fri, 1 Apr 2022 02:59:00 +0000 |
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> Thanks for the info. I don't know of anything block or nvme specific that might > explain an order of magnitude perf difference. > > Could you try the same test without the filesytems? You mentioned using mdraid, > so try '--filename=/dev/mdX'. If that also shows similiar performance > difference, try using one of your nvme member drives directly, like > '--filename=/dev/nvme1n1'. That should isolate which subsystem is contributing > to the difference. >
With Keith's suggestions you can always take the perf numbers and compare before and after mainly for nvme_queue_rq() and nvme_irq().
-ck
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