NFS Write Performance

Matt Rippa mrippa at
Fri May 11 03:13:38 UTC 2012

On 05/10/2012 04:39 PM, Chris Johns wrote:
> On 11/05/12 10:59 AM, Matt Rippa wrote:
>> Hi,
>> I'm trying to compare in rough numbers the speed of writing a 50
>> MB file from RTEMS to an NFS mount. In VxWorks 5.5.1, one of our
>> detector systems is taking 21 seconds to write a file of this
>> size to an NFS mount. WindRiver claims the performance is better
>> in workbench 6.3.
>> On Linux of course this is very fast, roughly 2 seconds on our
>> gigabit network. Sorry I don't have an RTEMS system up and
>> running or I already would have done some tests.
>> Thanks for any insight,
> It is difficult for RTEMS to quote numbers because the range of
> hardware that can be used varies widely and this will effect
> performance.
> The performance will also depend on the set up of the NFS
> client, ie the amount of buffer space you have configured.
> Where is the 50M of data being stored ?

This is an MVME6100 mounting an nfs share to write data to.
Physically that mount is some kind of NetApp Storage Device. The
application acquires pixel data from an array controller
attached on a PMC card, then copies that 50M to the nfs mount.

I'm just trying to find if it's known that RTEMs can perform better.

Thanks again,

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