Re: High latency in metada write

Lombardi, Johann

Hi there,


Could you please tell us more about your HW configuration and the test case (e.g. I/O size, read or write, object class, …)? We definitely see lower latency in our internal testing.





From: <> on behalf of "shadow_vector@..." <shadow_vector@...>
Reply-To: "" <>
Date: Tuesday 11 January 2022 at 12:26
To: "" <>
Subject: [daos] High latency in metada write


Hello everyone:
  Recently, I did some testing with daos array interface, found that after finishing nvme bio, it took me a long time for writing metadata and resource release ; The total latency of single channel IO is about 80us, and  vos_update_end taks about 30 us(about 17us in dkey akey update via SCM); I thought that IO via SCM should be very fast, but through the test, it's slower than the nvme IO. Is evtree operation takes too long or are there other reasons?

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