Messages in this thread |  | | | Date | Wed, 11 Feb 2004 08:48:44 -0800 | | From | Alex Pankratov <> | | Subject | Re: [PATCH] [2.6] [2/2] hlist: remove IFs from hlist functions |
Andi Kleen wrote:
> Alex Pankratov <ap@swapped.cc> writes: > >> >>No, because its 'pprev' field *is* getting modified. > > I didn't notice this before, sorry. But this could end up > being a scalability problem on big SMP systems. Even though > the cache line of this is never read it will bounce all the > time between all CPUs using hlists and add considerably > latency and cross node traffic. Remember Linux is supposed > to run well on 128 CPU machines now.
That's a bit above my head. How does this potential latency compare to the speed up due to not having CMPs ? My cycle counting skills are a bit dusty :)
> > Maybe you can make it UP only, but I'm still not sure it's > worth it. >
Sorry, I didn't the 'UP' part. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |