On 3/9/22 9:00 PM, Ming Lei wrote: > Looks improvement on 4k is small, is it caused by pcie bw limit? > What is the IOPS when running the same t/io_uring on single optane > directly? Yes, see what you responded to higher up: "which ends up being bw limited for me, because the devices aren't linked gen4". Some of them are, but the adapters are a bit janky and we often end up with gen3 links and hence limited to ~3.2GB/sec per drive. But with the bw limits even on gen4, you're roughly at about 1.5M IOPS per drive at that point, so would expect lower percentage wise gains for 4k with polling. -- Jens Axboe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
