I think that rpc code is about receive/send size which is quite
different from NFS i/o size. Default max io size is 1M with GPFS fsal,
but it is the client that could also limit. Since the same client is
not limiting with kNFS, I am pretty sure you have something wrong in
your ganesh config. The actual value should be provided to NFS client
as part of FSINFO response. Please look at the FSINFO response with
tcpdump.
I know for a fact we have seen I/Os with 1MB at least with NFSv3. I
will experiment with NFSv4 just in case, but I doubt this is due to
code.
On Fri, Oct 21, 2016 at 7:19 AM, Marc Eshel <es...@us.ibm.com> wrote:
> We are not able to get IO bigger than 256K with Ganesha, same client and
> kNFS can get 1M.
> Is there something in Ganesha that limmits the IO size? see attached email
> maxsize = 256 * 1024; /* XXX */, is that a problem ?
> Marc.
>
>
>
> From: Sven Oehme/Almaden/IBM
> To: Olaf Weiser/Germany/IBM@IBMDE
> Cc: Malahal Naineni/Beaverton/IBM@IBMUS, dhil...@us.ibm.com,
> fschm...@us.ibm.com, gfsch...@us.ibm.com, Marc Eshel/Almaden/IBM@IBMUS,
> robg...@us.ibm.com
> Date: 10/20/2016 05:32 PM
> Subject: Re: nfs testing for SAP - status - new traces / new
> approach
>
>
> marc will send a email on what i found in the ganesha code. it seems that
> max rpc size is hard limited to 256k :
>
> * Find the appropriate buffer size
> */
> u_int /*ARGSUSED*/
> __rpc_get_t_size(int af, int proto, int size)
> {
> int maxsize, defsize;
>
> maxsize = 256 * 1024; /* XXX */
> switch (proto) {
> case IPPROTO_TCP:
> defsize = 64 * 1024; /* XXX */
> break;
> case IPPROTO_UDP:
> defsize = UDPMSGSIZE;
> break;
> default:
> defsize = RPC_MAXDATASIZE;
> break;
> }
> if (size == 0)
> return defsize;
>
> /* Check whether the value is within the upper max limit */
> return (size > maxsize ? (u_int) maxsize : (u_int) size);
> }
> 4:01:28 PM
> in : src/rpc_generic.c
>
>
> ------------------------------------------
> Sven Oehme
> Scalable Storage Research
> email: oeh...@us.ibm.com
> Phone: +1 (408) 824-8904
> IBM Almaden Research Lab
> ------------------------------------------
>
>
>
>
>
>
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