svn commit: samba r3944 - in branches/SAMBA_3_0/source: lib smbd
jpeach at sgi.com
Mon Nov 29 22:37:29 GMT 2004
On Fri, Nov 26, 2004 at 03:14:30PM -0800, Jeremy Allison wrote:
> On Thu, Nov 25, 2004 at 09:46:11AM +0100, Volker Lendecke wrote:
> > How much does sendfile gain us at all?
> 10%. I'm loath to give that up for some buggy network cards.
> It's off by default, the only purpose for that fix is to
> stop it breaking if on on a system that doesn't implement it.
Sendfile can give you a lot more on systems with relatively slower CPUs.
On a 4P Origin, using a sendfile-like call takes us from from being
CPU-bound in bcopy to doing line rate over 4 NICs. It is a very big win
for large streaming reads, which is a relatively common workload.
James Peach | jpeach at sgi.com | SGI Australian Software Group
I don't speak for SGI.
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