On Tue, Jan 13, 2026 at 11:48:21AM -0600, Jaehoon Kim wrote: > We evaluated the patches on an s390x host with a single guest using 16 > virtio block devices backed by FCP multipath devices in a separate-disk > setup, with the I/O scheduler set to 'none' in both host and guest. > > The fio workload included sequential and random read/write with varying > numbers of jobs (1,4,8,16) and io_depth of 8. The tests were conducted > with single and dual iothreads, using the newly introduced poll-weight > parameter to measure their impact on CPU cost and throughput. > > Compared to the baseline, across four FIO workload patterns (sequential > R/W, random R/W), and averaged over FIO job counts of 1, 4, 8, and 16, > throughput decreased slightly (-3% to -8% for one iothread, -2% to -5% > for two iothreads), while CPU usage on the s390x host dropped > significantly (-10% to -25% and -7% to -12%, respectively).
Hi Jaehoon, I would like to run the same fio benchmarks on a local NVMe drive (<10us request latency) to see how that type of hardware configuration is affected. Are the scripts and fio job files available somewhere? Thanks, Stefan
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