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Message-ID: <555084FB.7010303@kyup.com>
Date: Mon, 11 May 2015 13:31:23 +0300
From: Nikolay Borisov <kernel@...p.com>
To: linux-kernel@...r.kernel.org
Subject: RE: softirq under reporting with CONFIG_NO_HZ_* and under syn flood
?
Hello,
I can confirm that I'm also observing the same issue. Here is the output
of turbostat:
without hping running (Most of the time is spent in idle C6 state, which
is expected):
pk cor CPU %c0 GHz TSC SMI %c1 %c3 %c6 %c7 CTMP PTMP
%pc2 %pc3 %pc6 %pc7 Pkg_W Cor_W RAM_W PKG_% RAM_%
0.02 1.77 2.10 0 0.09 0.00 99.89 0.00
54 53 6.45 0.00 93.05 0.00 15.93 1.25 5.90 0.00 0.00
0 0 0 0.02 1.81 2.10 0 0.05 0.00 99.92 0.00 47
47 6.53 0.00 93.00 0.00 7.86 0.57 4.22 0.00 0.00
0 0 12 0.01 1.48 2.10 0 0.07
0 1 1 0.05 1.46 2.10 0 0.18 0.00 99.77 0.00 47
0 1 13 0.01 1.56 2.10 0 0.22
0 2 2 0.01 1.61 2.10 0 0.06 0.00 99.93 0.00 47
0 2 14 0.02 1.81 2.10 0 0.05
0 3 3 0.03 1.92 2.10 0 0.04 0.00 99.93 0.00 47
0 3 15 0.01 1.60 2.10 0 0.07
0 4 4 0.01 1.60 2.10 0 0.06 0.00 99.93 0.00 47
0 4 16 0.01 1.61 2.10 0 0.06
0 5 5 0.01 1.57 2.10 0 0.03 0.00 99.96 0.00 47
0 5 17 0.00 1.62 2.10 0 0.03
1 0 6 0.01 1.66 2.10 0 0.03 0.00 99.96 0.00 51
53 6.37 0.00 93.10 0.00 8.07 0.67 1.68 0.00 0.00
1 0 18 0.01 1.57 2.10 0 0.04
1 1 7 0.03 1.44 2.10 0 0.10 0.00 99.87 0.00 51
1 1 19 0.00 1.62 2.10 0 0.13
1 2 8 0.01 1.64 2.10 0 0.06 0.00 99.94 0.00 51
1 2 20 0.01 1.41 2.10 0 0.05
1 3 9 0.03 1.57 2.10 0 0.11 0.00 99.86 0.00 51
1 3 21 0.01 1.49 2.10 0 0.13
1 4 10 0.20 2.04 2.10 0 0.08 0.00 99.72 0.00 51
1 4 22 0.01 1.49 2.10 0 0.27
1 5 11 0.01 1.66 2.10 0 0.11 0.00 99.88 0.00 54
1 5 23 0.02 1.71 2.10 0 0.10
And with hping running as per your email:
pk cor CPU %c0 GHz TSC SMI %c1 %c3 %c6 %c7 CTMP PTMP
%pc2 %pc3 %pc6 %pc7 Pkg_W Cor_W RAM_W PKG_% RAM_%
10.91 2.10 2.10 0 36.57 0.75 51.77 0.00
59 59 49.50 0.13 0.86 0.00 46.39 22.55 5.49 0.00 0.00
0 0 0 0.10 2.07 2.10 0 94.47 1.68 3.76 0.00 56
59 0.66 0.27 0.71 0.00 28.70 16.90 3.85 0.00 0.00
0 0 12 31.26 2.10 2.10 0 63.31
0 1 1 33.87 2.10 2.10 0 61.20 1.58 3.35 0.00 55
0 1 13 33.87 2.10 2.10 0 61.20
0 2 2 33.77 2.10 2.10 0 61.59 1.42 3.22 0.00 56
0 2 14 33.95 2.10 2.10 0 61.42
0 3 3 31.66 2.10 2.10 0 63.25 1.37 3.72 0.00 52
0 3 15 0.03 2.01 2.10 0 94.88
0 4 4 31.59 2.10 2.10 0 62.80 1.47 4.14 0.00 59
0 4 16 0.03 2.01 2.10 0 94.36
0 5 5 31.21 2.10 2.10 0 63.43 1.50 3.86 0.00 57
0 5 17 0.03 2.00 2.10 0 94.61
1 0 6 0.04 1.72 2.10 0 0.08 0.00 99.88 0.00 55
58 98.33 0.00 1.00 0.00 17.70 5.65 1.64 0.00 0.00
1 0 18 0.01 1.47 2.10 0 0.11
1 1 7 0.02 1.53 2.10 0 0.05 0.00 99.94 0.00 52
1 1 19 0.01 1.43 2.10 0 0.06
1 2 8 0.01 1.49 2.10 0 0.04 0.00 99.95 0.00 58
1 2 20 0.01 1.31 2.10 0 0.04
1 3 9 0.04 1.59 2.10 0 0.09 0.00 99.88 0.00 51
1 3 21 0.01 1.41 2.10 0 0.11
1 4 10 0.22 2.04 2.10 0 0.09 0.00 99.69 0.00 53
1 4 22 0.01 1.54 2.10 0 0.30
1 5 11 0.06 1.91 2.10 0 0.10 0.00 99.84 0.00 52
1 5 23 0.02 1.49 2.10 0 0.15
Which clearly shows that the processor spent some time to process the
syn flood packets, however
"top" reported the cpu usage at 0%. My kernel version is v4.0
View attachment "kernel-conf" of type "text/plain" (93646 bytes)
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