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Message-ID: <20111020024936.GA19911@localhost>
Date: Thu, 20 Oct 2011 10:49:36 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Trond Myklebust <Trond.Myklebust@...app.com>,
linux-nfs@...r.kernel.org
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
Dave Chinner <david@...morbit.com>,
Greg Thelen <gthelen@...gle.com>,
Minchan Kim <minchan.kim@...il.com>,
Vivek Goyal <vgoyal@...hat.com>,
Andrea Righi <arighi@...eler.com>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Tang Feng <feng.tang@...el.com>
Subject: Re: [RFC][PATCH 2/2] nfs: scale writeback threshold proportional
to dirty threshold
> > if (nfs_congestion_kb > dirty_thresh / 8)
> > nfs_congestion_kb = dirty_thresh / 8;
To confirm whether that's a good threshold, I tried double it by
using "/ 4". It results in -8.4% overall throughput regression. So
I'll stick with the current "/ 8".
Thanks,
Fengguang
---
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
472.17 -8.4% 432.32 TOTAL write_bw
15776.00 -27.3% 11466.00 TOTAL nfs_nr_commits
401731.00 +75.5% 705206.00 TOTAL nfs_nr_writes
918.32 +22.4% 1124.07 TOTAL nfs_commit_size
4.97 -25.3% 3.71 TOTAL nfs_write_size
14098.08 -30.6% 9788.99 TOTAL nfs_write_queue_time
1314.33 +55.3% 2041.51 TOTAL nfs_write_rtt_time
15438.68 -23.2% 11851.79 TOTAL nfs_write_execute_time
177.75 +73.1% 307.68 TOTAL nfs_commit_queue_time
15026.97 -3.6% 14491.26 TOTAL nfs_commit_rtt_time
15227.06 -2.7% 14809.49 TOTAL nfs_commit_execute_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
44.49 -7.7% 41.08 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
62.35 -1.7% 61.28 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
67.51 -10.0% 60.76 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
22.90 -30.0% 16.03 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
29.91 -16.9% 24.87 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
26.51 -20.0% 21.20 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
68.96 -1.2% 68.13 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
60.08 -17.9% 49.30 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
70.55 +4.1% 73.44 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
5.63 -16.9% 4.68 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
7.91 -2.4% 7.71 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
5.38 -28.7% 3.84 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
472.17 -8.4% 432.32 TOTAL write_bw
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
2565.00 -11.6% 2267.00 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
384.00 +1.8% 391.00 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
866.00 -9.9% 780.00 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
5801.00 -41.0% 3423.00 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
2092.00 -27.6% 1515.00 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
3231.00 -24.2% 2450.00 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
408.00 -2.9% 396.00 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
46.00 -4.3% 44.00 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
86.00 +9.3% 94.00 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
138.00 -51.4% 67.00 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
119.00 -91.6% 10.00 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
40.00 -27.5% 29.00 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
15776.00 -27.3% 11466.00 TOTAL nfs_nr_commits
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
17896.00 +30.5% 23348.00 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
62623.00 +371.7% 295418.00 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
37830.00 +37.4% 51991.00 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
27685.00 +13.1% 31312.00 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
51531.00 +7.4% 55330.00 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
84310.00 +14.8% 96814.00 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
21208.00 +0.8% 21375.00 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
26724.00 +5.1% 28092.00 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
31308.00 +67.6% 52461.00 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
12866.00 +13.9% 14649.00 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
12907.00 +9.2% 14088.00 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
14843.00 +37.0% 20328.00 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
401731.00 +75.5% 705206.00 TOTAL nfs_nr_writes
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
5.21 +5.2% 5.48 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
48.66 -3.4% 47.01 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
23.39 -0.1% 23.36 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
1.19 +18.7% 1.41 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
4.28 +15.1% 4.92 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
2.46 +5.5% 2.60 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
50.71 +1.7% 51.57 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
464.69 -0.5% 462.22 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
245.31 -4.8% 233.60 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
12.22 +71.4% 20.94 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
19.89 +1063.9% 231.46 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
40.33 -2.0% 39.52 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
918.32 +22.4% 1124.07 TOTAL nfs_commit_size
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
0.75 -28.7% 0.53 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
0.30 -79.1% 0.06 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
0.54 -34.6% 0.35 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
0.25 -38.1% 0.15 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
0.17 -22.4% 0.13 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
0.09 -30.3% 0.07 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
0.98 -2.1% 0.96 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
0.80 -9.5% 0.72 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
0.67 -37.9% 0.42 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
0.13 -26.9% 0.10 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
0.18 -10.4% 0.16 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
0.11 -48.1% 0.06 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
4.97 -25.3% 3.71 TOTAL nfs_write_size
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
383.37 -32.7% 258.17 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
5483.72 -67.9% 1759.47 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
3757.03 -36.1% 2399.96 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
2.61 +9692.1% 255.20 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
145.09 +277.8% 548.13 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
57.93 +584.8% 396.71 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
498.56 -1.1% 492.84 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
2475.43 +15.0% 2847.51 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
1293.33 -35.9% 829.56 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
0.20 +188.5% 0.59 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
0.56 -11.5% 0.49 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
0.25 +39.0% 0.35 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
14098.08 -30.6% 9788.99 TOTAL nfs_write_queue_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
156.19 +153.8% 396.37 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
47.14 -60.0% 18.86 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
74.76 +59.7% 119.40 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
176.05 +77.5% 312.45 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
88.28 +32.3% 116.82 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
107.48 +12.3% 120.71 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
129.32 -14.8% 110.23 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
85.62 +36.9% 117.24 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
58.52 -20.8% 46.34 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
118.53 +115.7% 255.64 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
112.27 +40.8% 158.12 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
160.16 +68.2% 269.33 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
1314.33 +55.3% 2041.51 TOTAL nfs_write_rtt_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
540.09 +21.2% 654.86 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
5533.64 -67.8% 1779.65 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
3833.18 -34.2% 2521.16 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
178.79 +217.6% 567.74 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
233.78 +184.6% 665.23 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
165.69 +212.4% 517.63 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
630.13 -4.0% 605.10 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
2574.27 +15.6% 2976.37 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
1357.04 -35.2% 879.46 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
118.76 +115.8% 256.26 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
112.86 +40.6% 158.64 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
160.43 +68.1% 269.70 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
15438.68 -23.2% 11851.79 TOTAL nfs_write_execute_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
4.15 -29.5% 2.92 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
5.79 +550.6% 37.64 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
5.30 +161.4% 13.86 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
0.63 +23.4% 0.78 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
0.77 +52.3% 1.17 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
0.54 +100.0% 1.08 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
66.40 +44.8% 96.17 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
25.80 +41.4% 36.48 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
67.99 +72.2% 117.05 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
0.19 +66.4% 0.31 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
0.10 0.00 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
0.10 +106.9% 0.21 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
177.75 +73.1% 307.68 TOTAL nfs_commit_queue_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
786.25 -7.3% 729.04 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
523.35 +4.8% 548.62 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
487.58 +4.9% 511.71 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
181.60 +22.2% 221.92 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
110.03 +13.2% 124.60 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
128.24 +11.0% 142.35 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
4352.76 -5.2% 4126.10 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
4022.83 -2.6% 3917.34 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
4282.52 -6.6% 3999.64 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
62.09 +56.1% 96.94 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
39.20 -22.5% 30.40 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
50.52 -15.7% 42.59 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
15026.97 -3.6% 14491.26 TOTAL nfs_commit_rtt_time
3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-nfs-thresh-4-next-20111014+
------------------------ ------------------------
790.68 -7.4% 732.23 NFS-thresh=100M/nfs-10dd-4k-32p-32768M-100M:10-X
529.17 +10.8% 586.28 NFS-thresh=100M/nfs-1dd-4k-32p-32768M-100M:10-X
493.32 +6.6% 525.82 NFS-thresh=100M/nfs-2dd-4k-32p-32768M-100M:10-X
182.35 +22.2% 222.82 NFS-thresh=10M/nfs-10dd-4k-32p-32768M-10M:10-X
110.82 +13.5% 125.80 NFS-thresh=10M/nfs-1dd-4k-32p-32768M-10M:10-X
128.80 +11.4% 143.46 NFS-thresh=10M/nfs-2dd-4k-32p-32768M-10M:10-X
4420.89 -4.4% 4224.24 NFS-thresh=1G/nfs-10dd-4k-32p-32768M-1024M:10-X
4048.67 -2.3% 3953.91 NFS-thresh=1G/nfs-1dd-4k-32p-32768M-1024M:10-X
4370.05 -5.6% 4124.34 NFS-thresh=1G/nfs-2dd-4k-32p-32768M-1024M:10-X
62.33 +56.1% 97.28 NFS-thresh=1M/nfs-10dd-4k-32p-32768M-1M:10-X
39.33 -22.4% 30.50 NFS-thresh=1M/nfs-1dd-4k-32p-32768M-1M:10-X
50.65 -15.5% 42.79 NFS-thresh=1M/nfs-2dd-4k-32p-32768M-1M:10-X
15227.06 -2.7% 14809.49 TOTAL nfs_commit_execute_time
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