io_uring: increase IORING_MAX_ENTRIES to 32K
Some workloads can require far more than 4K oustanding entries. For example memcached can have ~300K sockets over ~40 cores. Bumping the max to 32K seems to work pretty well. Reported-by: NDan Melnic <dmm@fb.com> Signed-off-by: NDaniel Xu <dxu@dxuuu.xyz> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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