On Mon, 2003-06-16 at 10:59, Greg Freemyer wrote:
> >> On Mon, 2003-06-16 at 10:18, Greg Freemyer wrote:
> >> > I normally use the SuSE 8.2 standard kernel (2.4.20 + XFS 1.2 + lots of
> >> other patches)
> >> >
> >> > The NFS performance is pretty poor.
> >> >
> >> > Has anyone done any NFS performance testing with XFS 1.3pre, or recent
> >> 2.4.21 cvs?
>
> >> What do yo mean by 'the NFS performance is pretty poor'? I am running
> >> Redhat 8.0 with the kernel upgraded to 2.4.20 + XFS 1.2 and I am happy
> >> with the NFS performance. I would like it to be better, but I am not
> >> blaming XFS for the performance issue. My NFS performance is
> >> 50% of the underlying disk speed. I run with NFS v3, UDP, 8k rsize and
> >> wsize. The performance of XFS is better than EXT3 for my tests.
> >> I usually use multiple instances of dd from multiple nodes. I care
> >> about big files not small files. The small file performance and
> >> interactivity is satisfactory though.
>
> >> What are you getting and what do you expect?
>
> >> Craig
>
> Craig,
>
> We have done some basic testing with iometer and 4 clients (I think) and
> 100Mbit lan (dedicated in a lab).
>
> With Samba Shares I can get almost 100% efficiency across the lan (i.e. 10
> MB/sec of data)
>
> With NFS (NVS v3, UDP, default rsize/wsize), I'm only getting about 10%
> efficiency (i.e. 1 MB/sec of data).
>
> I have not cared too much previously, but I need to start using NFS soon, and
> I need to pick between 3 choices:
>
> 1) Work with the SuSE kernel and try to tune it.
> 2) Use a pure XFS 1.2 kernel (2.4.19 based)
> 3) Go with a XFS 1.3pre kernel (currently 2.4.20, but apparently soon to be
> 2.4.21)
>
> If the latest XFS 1.3pre or cvs code seems to be working well with NFS, that
> is my preference.
>
I do not have this problem. I get about 11 MB/s over
Fast ethernet. This with very fast disk. The default
settings for NFS are not as optimal as they should be.
The default rsize/wsize is 1024. You should increase
this to 8192. Also, write sync is on by default and
will hurt performance. I turn that off (I don't need it).
You have to set nosync on the server and the clients.
Also look at the NFS performance HOWTO for other
suggestions and tweaks.
http://nfs.sourceforge.net/nfs-howto/performance.html
> Greg
--
Craig Tierney <ctierney@xxxxxxxx>
|