From: "Alex,Shi" <alex.shi@intel.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Rientjes <rientjes@google.com>,
Christoph Lameter <cl@linux.com>,
"penberg@kernel.org" <penberg@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: RE: [PATCH 1/3] slub: set a criteria for slub node partial adding
Date: Wed, 14 Dec 2011 14:56:52 +0800 [thread overview]
Message-ID: <1323845812.16790.8307.camel@debian> (raw)
In-Reply-To: <1323845054.2846.18.camel@edumazet-laptop>
> > Thanks for the data. Real netperf is hard to give enough press on SLUB.
> > but as I mentioned before, I also didn't find real performance change on
> > my loopback netperf testing.
> >
> > I retested hackbench again. about 1% performance increase still exists
> > on my 2 sockets SNB/WSM and 4 sockets NHM. and no performance drop for
> > other machines.
> >
> > Christoph, what's comments you like to offer for the results or for this
> > code change?
>
> I believe far more aggressive mechanism is needed to help these
> workloads.
>
> Please note that the COLD/HOT page concept is not very well used in
> kernel, because its not really obvious that some decisions are always
> good (or maybe this is not well known)
Hope Christoph know everything of SLUB. :)
>
> We should try to batch things a bit, instead of doing a very small unit
> of work in slow path.
>
> We now have a very fast fastpath, but inefficient slow path.
>
> SLAB has a litle cache per cpu, we could add one to SLUB for freed
> objects, not belonging to current slab. This could avoid all these
> activate/deactivate overhead.
Maybe worth to try or maybe Christoph had studied this?
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next prev parent reply other threads:[~2011-12-14 6:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-02 8:23 [PATCH 1/3] slub: set a criteria for slub node partial adding Alex Shi
2011-12-02 8:23 ` [PATCH 2/3] slub: remove unnecessary statistics, deactivate_to_head/tail Alex Shi
2011-12-02 8:23 ` [PATCH 3/3] slub: fill per cpu partial only when free objects larger than one quarter Alex Shi
2011-12-02 14:44 ` [PATCH 2/3] slub: remove unnecessary statistics, deactivate_to_head/tail Christoph Lameter
2011-12-06 21:08 ` David Rientjes
2011-12-02 11:36 ` [PATCH 1/3] slub: set a criteria for slub node partial adding Eric Dumazet
2011-12-02 20:02 ` Christoph Lameter
2011-12-05 2:21 ` Shaohua Li
2011-12-05 10:01 ` Alex,Shi
2011-12-05 3:28 ` Alex,Shi
2011-12-02 14:43 ` Christoph Lameter
2011-12-05 9:22 ` Alex,Shi
2011-12-06 21:06 ` David Rientjes
2011-12-07 5:11 ` Shaohua Li
2011-12-07 7:28 ` David Rientjes
2011-12-12 2:43 ` Shaohua Li
2011-12-12 4:14 ` Alex,Shi
2011-12-12 4:35 ` Shaohua Li
2011-12-12 4:25 ` Alex,Shi
2011-12-12 4:48 ` Shaohua Li
2011-12-12 6:17 ` Alex,Shi
2011-12-12 6:09 ` Eric Dumazet
2011-12-14 1:29 ` David Rientjes
2011-12-14 2:43 ` Shaohua Li
2011-12-14 2:38 ` David Rientjes
2011-12-09 8:30 ` Alex,Shi
2011-12-09 10:10 ` David Rientjes
2011-12-09 13:40 ` Shi, Alex
2011-12-14 1:38 ` David Rientjes
2011-12-14 2:36 ` David Rientjes
2011-12-14 6:06 ` Alex,Shi
2011-12-14 6:44 ` Eric Dumazet
2011-12-14 6:47 ` Pekka Enberg
2011-12-14 14:53 ` Christoph Lameter
2011-12-14 6:56 ` Alex,Shi [this message]
2011-12-14 14:59 ` Christoph Lameter
2011-12-14 17:33 ` Eric Dumazet
2011-12-14 18:26 ` Christoph Lameter
2011-12-13 13:01 ` Shi, Alex
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