On Tue, Apr 19, 2022 at 10:56:05PM -0400, Bruce Momjian wrote: > NVMe devices have a maximum queue length of 64k: > > https://blog.westerndigital.com/nvme-queues-explained/ > > but our effective_io_concurrency maximum is 1,000: > > test=> set effective_io_concurrency = 1001; > ERROR: 1001 is outside the valid range for parameter > "effective_io_concurrency" (0 .. 1000) > > Should we increase its maximum to 64k? Backpatched? (SATA has a > maximum queue length of 256.)
If there are demonstrable improvements with higher values, this seems reasonable to me. I would even suggest removing the limit completely so this doesn't need to be revisited in the future. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com
