From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Christoph Lameter <cl@linux.com>, brouer@redhat.com
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Alexander Duyck <alexander.duyck@gmail.com>,
Hannes Frederic Sowa <hannes@stressinduktion.org>
Subject: Re: [PATCH 3/3] slub: build detached freelist with look-ahead
Date: Wed, 22 Jul 2015 01:28:19 +0200 [thread overview]
Message-ID: <20150722012819.6b98a599@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1507210846060.27213@east.gentwo.org>
On Tue, 21 Jul 2015 08:50:36 -0500 (CDT)
Christoph Lameter <cl@linux.com> wrote:
> On Mon, 20 Jul 2015, Jesper Dangaard Brouer wrote:
>
> > Yes, I think it is merged... how do I turn off merging?
>
> linux/Documentation/kernel-parameters.txt
>
> slab_nomerge [MM]
> Disable merging of slabs with similar size. May be
> necessary if there is some reason to distinguish
> allocs to different slabs. Debug options disable
> merging on their own.
> For more information see Documentation/vm/slub.txt.
I was hoping I could define this per slub runtime. Any chance this
would be made possible?
Setting boot param "slab_nomerge" made my benchmarking VERY stable
between runs (obj size 256).
Run01: slab_nomerge
1 - 63 cycles(tsc) 15.927 ns - 46 cycles(tsc) 11.707 ns
2 - 56 cycles(tsc) 14.185 ns - 28 cycles(tsc) 7.129 ns
3 - 54 cycles(tsc) 13.588 ns - 23 cycles(tsc) 5.762 ns
4 - 53 cycles(tsc) 13.291 ns - 20 cycles(tsc) 5.085 ns
8 - 51 cycles(tsc) 12.918 ns - 19 cycles(tsc) 4.886 ns
16 - 50 cycles(tsc) 12.607 ns - 19 cycles(tsc) 4.858 ns
30 - 51 cycles(tsc) 12.759 ns - 19 cycles(tsc) 4.980 ns
32 - 51 cycles(tsc) 12.930 ns - 19 cycles(tsc) 4.975 ns
34 - 93 cycles(tsc) 23.410 ns - 27 cycles(tsc) 6.924 ns
48 - 80 cycles(tsc) 20.193 ns - 25 cycles(tsc) 6.279 ns
64 - 73 cycles(tsc) 18.322 ns - 23 cycles(tsc) 5.939 ns
128 - 88 cycles(tsc) 22.083 ns - 29 cycles(tsc) 7.413 ns
158 - 97 cycles(tsc) 24.274 ns - 34 cycles(tsc) 8.696 ns
250 - 102 cycles(tsc) 25.556 ns - 40 cycles(tsc) 10.100 ns
Run02: slab_nomerge
1 - 63 cycles(tsc) 15.879 ns - 46 cycles(tsc) 11.701 ns
2 - 56 cycles(tsc) 14.222 ns - 28 cycles(tsc) 7.140 ns
3 - 54 cycles(tsc) 13.586 ns - 23 cycles(tsc) 5.783 ns
4 - 53 cycles(tsc) 13.339 ns - 20 cycles(tsc) 5.095 ns
8 - 51 cycles(tsc) 12.899 ns - 19 cycles(tsc) 4.905 ns
16 - 50 cycles(tsc) 12.624 ns - 19 cycles(tsc) 4.853 ns
30 - 51 cycles(tsc) 12.781 ns - 19 cycles(tsc) 4.984 ns
32 - 51 cycles(tsc) 12.933 ns - 19 cycles(tsc) 4.997 ns
34 - 93 cycles(tsc) 23.421 ns - 27 cycles(tsc) 6.909 ns
48 - 80 cycles(tsc) 20.241 ns - 25 cycles(tsc) 6.267 ns
64 - 73 cycles(tsc) 18.346 ns - 23 cycles(tsc) 5.947 ns
128 - 88 cycles(tsc) 22.192 ns - 29 cycles(tsc) 7.415 ns
158 - 97 cycles(tsc) 24.358 ns - 34 cycles(tsc) 8.693 ns
250 - 102 cycles(tsc) 25.597 ns - 40 cycles(tsc) 10.144 ns
Run03: slab_nomerge
1 - 63 cycles(tsc) 15.897 ns - 46 cycles(tsc) 11.685 ns
2 - 56 cycles(tsc) 14.178 ns - 28 cycles(tsc) 7.132 ns
3 - 54 cycles(tsc) 13.590 ns - 23 cycles(tsc) 5.774 ns
4 - 53 cycles(tsc) 13.314 ns - 20 cycles(tsc) 5.092 ns
8 - 51 cycles(tsc) 12.872 ns - 19 cycles(tsc) 4.886 ns
16 - 50 cycles(tsc) 12.603 ns - 19 cycles(tsc) 4.840 ns
30 - 50 cycles(tsc) 12.750 ns - 19 cycles(tsc) 4.966 ns
32 - 51 cycles(tsc) 12.910 ns - 19 cycles(tsc) 4.977 ns
34 - 93 cycles(tsc) 23.372 ns - 27 cycles(tsc) 6.929 ns
48 - 80 cycles(tsc) 20.205 ns - 25 cycles(tsc) 6.276 ns
64 - 73 cycles(tsc) 18.292 ns - 23 cycles(tsc) 5.929 ns
128 - 90 cycles(tsc) 22.516 ns - 29 cycles(tsc) 7.425 ns
158 - 99 cycles(tsc) 24.825 ns - 34 cycles(tsc) 8.668 ns
250 - 102 cycles(tsc) 25.652 ns - 40 cycles(tsc) 10.129 ns
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Sr. Network Kernel Developer at Red Hat
Author of http://www.iptv-analyzer.org
LinkedIn: http://www.linkedin.com/in/brouer
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next prev parent reply other threads:[~2015-07-21 23:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 16:01 [PATCH 0/3] slub: introducing detached freelist Jesper Dangaard Brouer
2015-07-15 16:01 ` [PATCH 1/3] slub: extend slowpath __slab_free() to handle bulk free Jesper Dangaard Brouer
2015-07-15 16:54 ` Christoph Lameter
2015-07-15 16:02 ` [PATCH 2/3] slub: optimize bulk slowpath free by detached freelist Jesper Dangaard Brouer
2015-07-15 16:56 ` Christoph Lameter
2015-07-15 16:02 ` [PATCH 3/3] slub: build detached freelist with look-ahead Jesper Dangaard Brouer
2015-07-16 9:57 ` Jesper Dangaard Brouer
2015-07-20 2:54 ` Joonsoo Kim
2015-07-20 21:28 ` Jesper Dangaard Brouer
2015-07-21 13:50 ` Christoph Lameter
2015-07-21 23:28 ` Jesper Dangaard Brouer [this message]
2015-07-23 6:34 ` Joonsoo Kim
2015-07-23 11:09 ` Jesper Dangaard Brouer
2015-07-23 14:14 ` Christoph Lameter
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