Re: default nfs mount options from linux to linux

[Bradford Arrington <brada@cadence.com>]

Bruce,

First thank you to all who replied. 

It turns out I should have just looked at the source code to the mount
command found in utils-linux tar package.

It seems that although it may look like its mount with 8k r/wsize, the
mount C code says it is automatically changed by the kernel it self when
needed.

This explains a lot because if I where to just mount it with 8k r/wsizes
the performance is slower than if I where to just mount linux to linux
with out any options (i.e. mount linxnfs:/export /mnt). 
These seem to be the initial defaults :
nfs rw,v3,rsize=8192,wsize=8192,hard,udp,lock

However this does not work with Solaris 10, in order to get higher
throughput speeds you must specify 8k r/wsizes 

-Brad

On Fri, 2005-04-22 at 08:47 -0700, Bruce Allan wrote:
> Mount the volume without options and check /proc/mounts.  Note that some 
> options may differ based on negotiation with the server.
> 
> Regards,
> ---
> Bruce Allan  <bruce.allan@us.ibm.com>
> Software Engineer, Linux Technology Center
> IBM Corporation, Beaverton OR USA
> 503-578-4187   IBM Tie-line 775-4187
> 
> 
> 
> 
> Bradford Arrington <brada@cadence.com> 
> Sent by: nfs-admin@lists.sourceforge.net
> 04/21/2005 06:01 PM
> 
> To
> nfs@lists.sourceforge.net
> cc
> 
> Subject
> [NFS] default nfs mount options from linux to linux
> 
> 
> 
> 
> 
> 
> 
> Does anyone know what or how to find the default mount option are when
> mounting an nfs volume?
> example
> mount linuxnfs:/export /mnt 
> 
> How do I find the rsize/wsize and any other options? (that are default)
> 
> I am lead to believe that the nfs man page information is false for
> r/wsize 1k (no way) (udp default is correct though). If I set the
> r/wsize to 1k performance is very slow. In a "vanilla" default as above
> it has the fastest iozone benchmarks.
> 
> Thanks,
> -Brad
> 
> 
> 
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