Re: [PATCH RFC v1 0/3] aio-poll: improve aio-polling efficiency

[Stefan Hajnoczi <stefanha@redhat.com>]

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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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