Re: (More) NFS Performance woes

[Christian Robottom Reis <kiko@async.com.br>]

On Thu, Dec 14, 2006 at 11:03:59AM -0500, J. Bruce Fields wrote:
> On Fri, Dec 15, 2006 at 12:39:51AM +1100, Christopher Smith wrote:
> > The first test is copying a single large file of about 700M from the 
> > (client) local disk to the NFS mount.
> > The second test is untarring a 700M tarfile from the (client) local disk 
> > to the NFS mount (~5000 files).
> > 
> > Test #1 consistently finishes in about 17 seconds, delivering about 40 
> > MiB/s.
> > Test #2 consistently finishes in about 85 seconds, delivering about 8 MiB/s
> 
> That's about 17ms per file?  Each of those 5000 file creations is a
> synchronous operation--the server doesn't respond until it's actually
> committed the operation to disk.  I don't really know what expected
> numbers are for your hardware, but given that for each file we have to
> wait for both the initial creation and the final flush of the data to
> disk on close, 17ms doesn't sound too far off.

I actually found the numbers that Christopher is seeing pretty good. If
I could get a 700MB write of 5000 files to an NFS mount in 85s I'd be
as happy as could be. I'm imagining that if this wasn't Gigabit this
would be a lot slower -- am I wrong?
-- 
Christian Robottom Reis | http://async.com.br/~kiko/ | [+55 16] 3376 0125

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