How Discord supercharges network disks for extreme low latency

Re:How Discord supercharges network disks for extreme low la... by ec109685 on Tuesday August 16, 2022 @12:07PM (#32484766)

Thanks. Do you see the same spikes with ebs volumes on AWS?

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Re:How Discord supercharges network disks for extreme low la... by seastarer on Tuesday August 16, 2022 @01:38PM (#32486116)

Some more data on Google PD: https://raw.githubusercontent.com/scylladb/diskplorer/master...

Very odd - notice how the latency is high when the read IOPS are low. When the read IOPS climb, 95th percentile latency drops.

Looks like there is a constant rate of high latency requests, and when the read IOPS climb, that constant rate moves to a higher quantile. I'd inspect the raw results but they're quite big: https://github.com/scylladb/diskplorer/blob/master/latency-m...

Background: https://github.com/scylladb/diskplorer/

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Re:How Discord supercharges network disks for extreme low la... by ec109685 on Wednesday August 17, 2022 @12:15AM (#32492269)

Very interesting. I wonder if higher iops involves reading from more servers and with request hedging it can smooth latency a lot better.

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Re:How Discord supercharges network disks for extreme low la... by seastarer on Tuesday August 16, 2022 @01:30PM (#32486015)

No.

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