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9ebe4b8c67
Unlike Copy, the NFSv4.2 Allocate and Deallocate operations do not allow a reply with partial completion. As such, the only way to limit the time the operation takes to provide a reasonable RPC RTT is to limit the size of the allocation/deallocation in the NFSv4.2 client. This patch adds a sysctl called vfs.nfs.maxalloclen to set the limit on the size of the Allocate operation. There is no way to know how long a server will take to do an allocate operation, but 64Mbytes results in a reasonable RPC RTT for the slow hardware I test on, so that is what the default value for vfs.nfs.maxalloclen is set to. For an 8Gbyte allocation, the elapsed time for doing it in 64Mbyte chunks was the same as the elapsed time taken for a single large allocation operation for a FreeBSD server with a UFS file system. MFC after: 2 weeks |
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