Re: Kernel 2.6.15.1 + NFS is 4 times slower than FTP!?

[Justin Piszcz <jpiszcz@lucidpixels.com>]

The file is 700MB.

Machine A (src) has 2GB of RAM / 2GB of swap
Machine B (dst) has 1GB of RAM / 2GB of swap.

Justin.

On Tue, 17 Jan 2006, Trond Myklebust wrote:

> On Tue, 2006-01-17 at 13:55 -0500, Justin Piszcz wrote:
> > Did you get my other e-mail?
> >
> > $ cp file /nfs/destination
> > $ lftp> put file
>
>
> Yes, but how big a file is this? Is it significantly larger than the
> amount of cache memory on the server? As I said, if ftp is failing to
> sync the file to disk, then you may be comparing apples and oranges.
>
> Cheers,
>  Trond
>
> > On Tue, 17 Jan 2006, Trond Myklebust wrote:
> >
> > > On Tue, 2006-01-17 at 13:38 -0500, Justin Piszcz wrote:
> > > > Writing from SRC(A) -> DST(B).
> > > > I have not tested reading, but as I recall there were similar speed issues
> > > > going the other way too, although I have not tested it recently.
> > >
> > > How were you testing it? I'm not sure that ftp will actually sync your
> > > file to disk (whereas that is pretty much mandatory for an NFS server),
> > > so unless you are transferring very large files, you would expect to see
> > > a speed difference due to caching of writes by the server.
> > >
> > > Cheers,
> > >  Trond
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