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Date: Fri, 02 Dec 2011 12:36:42 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: Alex Shi <alex.shi@...el.com> Cc: cl@...ux.com, penberg@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 1/3] slub: set a criteria for slub node partial adding Le vendredi 02 décembre 2011 à 16:23 +0800, Alex Shi a écrit : > From: Alex Shi <alexs@...el.com> > > Times performance regression were due to slub add to node partial head > or tail. That inspired me to do tunning on the node partial adding, to > set a criteria for head or tail position selection when do partial > adding. > My experiment show, when used objects is less than 1/4 total objects > of slub performance will get about 1.5% improvement on netperf loopback > testing with 2048 clients, wherever on our 4 or 2 sockets platforms, > includes sandbridge or core2. > > Signed-off-by: Alex Shi <alex.shi@...el.com> > --- > mm/slub.c | 18 ++++++++---------- > 1 files changed, 8 insertions(+), 10 deletions(-) > netperf (loopback or ethernet) is a known stress test for slub, and your patch removes code that might hurt netperf, but benefit real workload. Have you tried instead this far less intrusive solution ? if (tail == DEACTIVATE_TO_TAIL || page->inuse > page->objects / 4) list_add_tail(&page->lru, &n->partial); else list_add(&page->lru, &n->partial); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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