Message-ID: <56618949.10208@suse.cz>
Date:	Fri, 4 Dec 2015 13:38:33 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>
Subject: Re: [RFC 0/3] reduce latency of direct async compaction

On 12/04/2015 07:25 AM, Aaron Lu wrote:
> On Thu, Dec 03, 2015 at 09:10:44AM +0100, Vlastimil Babka wrote:
>> Aaron, could you try this on your testcase?
>
> One time result isn't stable enough, so I did 9 runs for each commit,
> here is the result:
>
> base: 25364a9e54fb8296837061bf684b76d20eec01fb
> head: 7433b1009ff5a02e1e9f3444802daba2cf385d27
> (head =  base + this_patch_serie)
>
> The always-always case(transparent_hugepage set to always and defrag set
> to always):
>
> Result for base:
> $ cat {0..8}/swap
> cmdline: /lkp/aaron/src/bin/usemem 100000622592
> 100000622592 transferred in 103 seconds, throughput: 925 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99999559680
> 99999559680 transferred in 92 seconds, throughput: 1036 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99996171264
> 99996171264 transferred in 92 seconds, throughput: 1036 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100005663744
> 100005663744 transferred in 150 seconds, throughput: 635 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100002966528
> 100002966528 transferred in 87 seconds, throughput: 1096 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99995784192
> 99995784192 transferred in 131 seconds, throughput: 727 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100003731456
> 100003731456 transferred in 97 seconds, throughput: 983 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100006440960
> 100006440960 transferred in 109 seconds, throughput: 874 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99998813184
> 99998813184 transferred in 122 seconds, throughput: 781 MB/s
> Max: 1096 MB/s
> Min: 635 MB/s
> Avg: 899 MB/s
>
> Result for head:
> $ cat {0..8}/swap
> cmdline: /lkp/aaron/src/bin/usemem 100003163136
> 100003163136 transferred in 105 seconds, throughput: 908 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99998524416
> 99998524416 transferred in 78 seconds, throughput: 1222 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99993646080
> 99993646080 transferred in 108 seconds, throughput: 882 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99998936064
> 99998936064 transferred in 114 seconds, throughput: 836 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100002204672
> 100002204672 transferred in 73 seconds, throughput: 1306 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99998140416
> 99998140416 transferred in 146 seconds, throughput: 653 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100002941952
> 100002941952 transferred in 78 seconds, throughput: 1222 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99996917760
> 99996917760 transferred in 109 seconds, throughput: 874 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100001405952
> 100001405952 transferred in 96 seconds, throughput: 993 MB/s
> Max: 1306 MB/s
> Min: 653 MB/s
> Avg: 988 MB/s

Ok that looks better than the first results :) The series either helped, 
or it's just noise. But hopefully not worse.

> Result for v4.3 as a reference:
> $ cat {0..8}/swap
> cmdline: /lkp/aaron/src/bin/usemem 100002459648
> 100002459648 transferred in 96 seconds, throughput: 993 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99997375488
> 99997375488 transferred in 96 seconds, throughput: 993 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99999028224
> 99999028224 transferred in 107 seconds, throughput: 891 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100000137216
> 100000137216 transferred in 91 seconds, throughput: 1047 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100003835904
> 100003835904 transferred in 80 seconds, throughput: 1192 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100000143360
> 100000143360 transferred in 96 seconds, throughput: 993 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100020593664
> 100020593664 transferred in 101 seconds, throughput: 944 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100005805056
> 100005805056 transferred in 87 seconds, throughput: 1096 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100008360960
> 100008360960 transferred in 74 seconds, throughput: 1288 MB/s
> Max: 1288 MB/s
> Min: 891 MB/s
> Avg: 1048 MB/s

Hard to say if there's actual regression from 4.3 to 4.4, it's too 
noisy. More iterations could help, but then the eventual bisection would 
need them too.

> The always-never case:
>
> Result for head:
> $ cat {0..8}/swap
> cmdline: /lkp/aaron/src/bin/usemem 100003940352
> 100003940352 transferred in 71 seconds, throughput: 1343 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100007411712
> 100007411712 transferred in 62 seconds, throughput: 1538 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100001875968
> 100001875968 transferred in 64 seconds, throughput: 1490 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100003912704
> 100003912704 transferred in 62 seconds, throughput: 1538 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100002238464
> 100002238464 transferred in 66 seconds, throughput: 1444 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100003670016
> 100003670016 transferred in 65 seconds, throughput: 1467 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 99998364672
> 99998364672 transferred in 68 seconds, throughput: 1402 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100005417984
> 100005417984 transferred in 70 seconds, throughput: 1362 MB/s
> cmdline: /lkp/aaron/src/bin/usemem 100005304320
> 100005304320 transferred in 64 seconds, throughput: 1490 MB/s
> Max: 1538 MB/s
> Min: 1343 MB/s
> Avg: 1452 MB/s
>

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