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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