illumos gate

The default value of the nfs4_max_transfer_size tunable should never be less than either nfs4_max_transfer_size_cots or nfs4_max_transfer_size_rdma. But it is:

63uint_t nfs4_max_transfer_size = 32 * 1024;
64uint_t nfs4_max_transfer_size_cots = 1024 * 1024;
65uint_t nfs4_max_transfer_size_rdma = 1024 * 1024;

See this comment for similar NFSv3 related tunable:

286/* this should reflect the largest transfer size possible */
287static int nfs3_max_transfer_size = 1024 * 1024;

...

299static uint_t nfs3_max_transfer_size_clts = 32 * 1024;
300static uint_t nfs3_max_transfer_size_cots = 1024 * 1024;
301static uint_t nfs3_max_transfer_size_rdma = 1024 * 1024;