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Date: Fri, 7 Mar 2008 03:25:37 +0100 From: Nick Piggin <npiggin@...e.de> To: Christoph Lameter <clameter@....com> Cc: Pekka Enberg <penberg@...helsinki.fi>, netdev@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, yanmin_zhang@...ux.intel.com, David Miller <davem@...emloft.net>, Eric Dumazet <dada1@...mosbay.com> Subject: Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment On Thu, Mar 06, 2008 at 06:20:40PM -0800, Christoph Lameter wrote: > On Fri, 7 Mar 2008, Nick Piggin wrote: > > > > Do you have a case in mind where that would be useful? We had a > > > > Patch 3/3 > > Those already have SLAB_HWCACHE_ALIGN. > > The point is to switch off alignment for UP? Cant we do that with > SLAB_HWCACHE_ALIGN too since SLOB seemed to work successfully without it > in the past? See my next post to correct your understanding of HWCACHE_ALIGN. > > > Note that there is also KMEM_CACHE which picks up the alignment from > > > the compiler. > > > > Yeah, that's not quite as good either. My allocation flag is dynamic, so > > it will not bloat things for no reason on UP machines and SMP kernels. > > It also aligns to the detected machine cacheline size rather than a > > compile time constant. > > Is that really a noteworthy effect? Yes. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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