Re: memove performance of NetBSD

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Thu, Jan 28, 2010 at 02:07:45PM +0530, Channa wrote:
> Hi,
> 
> Thor Lancelot Simon <tls%panix.com@localhost>:
> > On Thu, Jan 28, 2010 at 11:56:09AM +0530, Channa wrote:
> >>
> >> Yes the performance improves when the memmove is done as below:
> >>
> >> memmove(dst, src+1, sizeof(src));
> >> memmove(dst, src+2, sizeof(src));
> >> memmove(dst, src+3, sizeof(src));
> >
> > That's a pretty weird special case, since the start addresses overlap.
> > What if you use more realistic start addresses?
> >
> [..]
> 
> I wanted to verify for unaligned address, using malloc() i got the
> memory for the src and dst and I always got aligned address.

Yes, but the three copies you're doing (src+1, src+2, and src+3)
overlap each other.

Thor