Re: [PATCH v2 2/2] x86: add prefetching to do_csum

[Neil Horman]

On Wed, Nov 06, 2013 at 10:23:10AM -0800, Eric Dumazet wrote:
> On Wed, 2013-11-06 at 10:54 -0500, Neil Horman wrote:
> 
> > My guess was that the whole comment was made in reference to the fact that
> > checksum offload negated all these advantages.  Thats not so true anymore, since
> > infiniband needs csum in software for ipoib.
> > 
> > I'll fix this up and send a v3, but I'll give it a day in case there are more
> > comments first.
> 
> Also please include netdev, I think people there are interested.
> 
Sure, will do in the updated version

> I caught this message, but I usually cannot read lkml traffic.
> 
> I wonder why you do not use (and/or change/tune) prefetch_range()
> instead of a local definition.
> 
I wanted to look into this further, because I wasn't (yet) sure if it was  a bug
or not, but from what I can see x86_64 doesn't define ARCH_HAS_PREFECTH.  That
makes prefetch_range() a nop (I confirmed this via objdump).  It seems like we
should either define ARCH_HAS_PREFETCH on x86_64, or we should remove the
#ifdef from prefetch_range
> 
> 
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/