default nfs mount options from linux to linux

default nfs mount options from linux to linux

[Bradford Arrington]

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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Re: default nfs mount options from linux to linux

[Dan Stromberg]

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If you want to empirically determine a good wsize, for example, you
might try the script below.  I still haven't had a chance to use it, but
I'd like to think it'll work fine.  :)

Also, if you're on a gigabit network, you may be able to improve NFS
performance a lot by turning on jumbo frames.

#!/usr/local/bin/bash
# with these options:
# bg,hard,intr,rsize=8192,wsize=8192
# we got 50Mbps over NFS to ext3 from esmf04d to esmft2
# I suspect UDP may be faster; we're using tcp here.  Not sure why AIX
# isn't reporting that.

#mount -o vers=3,proto=tcp,rsize=8192,wsize=8192 esmft2:/foo /mnt/foo
for proto in tcp udp
do
   for vers in 3 2
   do
      for size in $(seq 1024 16 65536)
      do
         echo
         echo $vers $proto $size
         cd /
         umount /mnt/foo
         mount -o insecure,vers="$vers",proto="$proto",rsize=
$size,wsize=$size \
            esmft2:/foo /mnt/foo
         cd /mnt/foo
         rm -f testfile
         # write 10 gigabytes
         echo writing 10 gigabytes: $proto $vers $size
         /bin/time dd if=/dev/zero of=testfile bs=1024k count=10240 2>&1
      done
   done
done


On Thu, 2005-04-21 at 18:01 -0700, Bradford Arrington wrote:

> 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
> 
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs

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Re: default nfs mount options from linux to linux

[Bruce Allan]

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



-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs




-------------------------------------------------------
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Re: default nfs mount options from linux to linux

[Bradford Arrington]

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
> 
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs
> 
> 


-------------------------------------------------------
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Re: default nfs mount options from linux to linux

[Dan Stromberg]

[-- Attachment #1: Type: text/plain, Size: 3480 bytes --]


You can generally verify the actual rsize/wsize using a sniffer, like
ethereal, tcpdump -v or snoop.

Solaris should be defaulting to 8K rsize and wsize, as should almost all
unixes.  It's the linuxes that have historically used smaller
rsize/wsize - I'm led to believe this was because so many network cards
used with linux used to be poor, and liked having smaller NFS
blocksizes.

On Fri, 2005-04-22 at 09:36 -0700, Bradford Arrington wrote:
> 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
> > 
> > 
> > 
> > -------------------------------------------------------
> > SF email is sponsored by - The IT Product Guide
> > Read honest & candid reviews on hundreds of IT Products from real users.
> > Discover which products truly live up to the hype. Start reading now.
> > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> > _______________________________________________
> > NFS maillist  -  NFS@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/nfs
> > 
> > 
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs

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