systems without pread?

[James Peach]

On Tue, 16 Dec 2003 15:12:21 -0800
Jeremy Allison <jra at samba.org> wrote:

> On Wed, Dec 17, 2003 at 09:30:22AM +1100, James Peach wrote:
> > >
> > > Hmmmm. How have you tested this performance win ?
> > 
> > I have a smallish test setup using an Origin 3k server and 4 Origin 300
> > clients. I'm connecting each client to the server through a different
> > gig-e NIC and running multiple load generators on each client. I'm
> > gathering performance numbers using Performance Co-Pilot - these include
> > NIC throughput, CPU time, samba IOPs per second, and a bunch more stuff.
> 
> What does the performance change look like on Linux ? Have you been
> able to do tests there yet ?

A preliminary experiment on write throughput (single client) running on
Linux 2.4.21 on IA64:

Workload: Streaming Write (pwrite)

    threads  network.interface.bytes
 16384 12    82.45 (in) 1.58 (out)   (with pread)
 16384 12    75.99 (in) 1.41 (out)   (without pread)

--
James Peach | jpeach at sgi.com | SGI Australian Software Group
I don't speak for SGI.