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- Apr 2010
How to modify NFS's rsize/wsize max value?
I read the kernel source code, and find the code as below list:
* To change the maximum rsize and wsize supported by the NFS client, adjust
* NFS_MAX_FILE_IO_SIZE. 64KB is a typical maximum, but some servers can
* support a megabyte or more. The default is left at 4096 bytes, which is
* reasonable for NFS over UDP.
#define NFS_MAX_FILE_IO_SIZE (1048576U)
#define NFS_DEF_FILE_IO_SIZE (4096U)
#define NFS_MIN_FILE_IO_SIZE (1024U)
but I modified the NFS_MAX_FILE_IO_SIZE with 2097152, remounted the NFS,the max value was still 1048576. I gussed that kernel source exist some checking code to return to the 1048576.
My question is: how to increase the max value of rsize and wsize?
thank you very much!