Xen users - Jun 2006 - General Question about NFS speed and XEN

Hello.
Just a question, I have measured 17 MB/sec file transfer speed over 
Gigabit Ethernet without jumbo frames exported from DomU to a DomU in a 
different Computer.

Before I started evaluating XEN I measured File filetransfer speed of 37 
MB/sec, this time with FTP. In both cases I copied a single 2 GB File.

Before I start evaluating different filesystems like iSCSI od GDFS, I 
want to know if the bottleneck is here NFS or XEN in general? I mean I 
know that FTP and NFS is not really comparable but.. will I get a lot 
more speed with onother filesystem?

Greetings,
Robert Welz

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On Sun, Jun 04, 2006 at 01:24:02AM +0200, Robert Welz
wrote:
> Just a question, I have measured 17 MB/sec file transfer speed over 
> Gigabit Ethernet without jumbo frames exported from DomU to a DomU in a 
> different Computer.
> 
> Before I started evaluating XEN I measured File filetransfer speed of 37 
> MB/sec, this time with FTP. In both cases I copied a single 2 GB File.
> 
> Before I start evaluating different filesystems like iSCSI od GDFS, I 
> want to know if the bottleneck is here NFS or XEN in general? I mean I 
NFS is pretty non-performant -- I''d redo your FTP test domU-to-domU so
you
have some apples-to-apples comparisons.  You can then compare Xen to non-Xen
(via the FTP tests), and compare FTP to NFS (both in domU).

- Matt

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On Saturday 03 June 2006 6:24 pm, Robert Welz wrote:
> Before I start evaluating different filesystems like iSCSI od GDFS, I
> want to know if the bottleneck is here NFS or XEN in general? I mean I
> know that FTP and NFS is not really comparable but.. will I get a lot
> more speed with onother filesystem?
as you point, FTP and NFS are two really different beasts; but also remember 
that NFS have a lot of configurable options.  sometimes one setting could 
improve performace in a given situation and degrade it on others.

at least, try changing these:

- TCP vs UDP transport.
- higher rsize and wsize (default 1024, some recommend 8192)
- lower rsize/wsize (sometimes just below MTU is better)


-- 
Javier


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> > NFS is pretty non-performant -- I''d redo your FTP test
domU-to-domU so you
> > have some apples-to-apples comparisons.  You can then compare Xen to
non-Xen
> > (via the FTP tests), and compare FTP to NFS (both in domU).
I have different experience but only on a 100Mb network. In my tests NFS
seem to be able to use all available bandwidth with a transfer speed
nearing 10MB/s. This was not running in a virtual machine though.

greets,
Staf.




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Thx to all. I am in the phase of testing now. Well, I just set up
GB Ethernet and wil start measuring throughput in every possible
permutation beginning with ftp. I have 2 32Bit bussed celerons, a 32 bit 
P4 and a 64 bit bussed PowerMac G4.
(xen-kernel, no xen, no domU''s running and so on).

I expect to be ready in 2 weeks. If someone is interested on the 
results, drop me a mail or a note here in this thread.


Greetings,
Robert

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Robert Welz wrote:
> Thx to all. I am in the phase of testing now. Well, I just set up
> GB Ethernet and wil start measuring throughput in every possible
> permutation beginning with ftp. I have 2 32Bit bussed celerons, a 32 bit 
> P4 and a 64 bit bussed PowerMac G4.
> (xen-kernel, no xen, no domU''s running and so on).
> 
> I expect to be ready in 2 weeks. If someone is interested on the 
> results, drop me a mail or a note here in this thread.
> 
> 
I''m interested. I''m sure others are too, post to the list.

-- 
// Randy MacLeod

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