Meltdown and Spectre flaws have caused some real trouble for IT admins and general users. Using SPDK iSCSI, we saw as much as a 25% impact while using only a single core. Storage Performance Development Kit (SPDK) tests, which provide a set of tools and libraries for writing high performance, scalable, user-mode storage applications, were measured in multiple test configurations.When CPU utilization was low (100% read case), as is the case with common storage provisioning, we saw an increase in CPU utilization, but no throughput performance impact. When we used a 70/30 read/write model, we saw a 2% decrease in throughput performance. When we conducted testing to stress the CPU (100% write case), we saw an 18% decrease in throughput performance because there was not CPU utilization headroom. For FlexibleIO, a benchmark simulating different types of I/O loads, results depend on many factors, including read/write mix, block size, drives and CPU utilization.This is an alarming situation on already vulnerable platforms.Д«esides the reboot issue, Intel has shared some benchmark information which reveals the performance impact of the vulnerability fix. While UEFI firmware updates from computer manufacturers or CPU microcode updates from Intel are both effective at mitigating the Meltdown and Spectre flaws, the updated computers are suffering from unexpected reboots.

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