linux-kernel - Re: high %CPU values after upgrading to the last stable kernel

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Message-ID: <c62985530810221404k2987da81q3e158e203c379b89@mail.gmail.com>
Date:	Wed, 22 Oct 2008 23:04:35 +0200
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	sbs <gexlie@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: high %CPU values after upgrading to the last stable kernel

2008/10/22 sbs <gexlie@...il.com>:
> after upgrading from 2.6.16 to 2.6.27 kernel top shows a strange
> picture of extremely highly %CPU values.
>
> # top -V
>        top: procps version 3.2.6
>
>
> # top
> top - 04:24:06 up 7 days,  1:12,  1 user,  load average: 2.28, 2.03, 2.00
> Tasks: 183 total,   2 running, 181 sleeping,   0 stopped,   0 zombie
> Cpu(s): 36.2% us,  2.4% sy,  0.0% ni, 56.1% id,  4.7% wa,  0.1% hi,  0.5% si
> Mem:  12473092k total, 11169060k used,  1304032k free,       16k buffers
> Swap:  2048248k total,      636k used,  2047612k free,  1257988k cached
>
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 19824 b      20   0 92212  17m 5420 S 4308  0.1   1:39.49 httpd
> 14396 b      20   0 92716  28m  16m S 3721  0.2  38:47.38 httpd
> 14024 b      20   0 92376  28m  16m S 2437  0.2  51:49.68 httpd
>  7415 b      20   0 96876  40m  24m D 2146  0.3  93:59.72 httpd
>  8182 b      20   0 94500  36m  21m S 1997  0.3 111:41.60 httpd
> 13461 b      20   0 94240  31m  17m S 1439  0.3  48:43.71 httpd
>  8466 b      20   0 92036  32m  21m S 1136  0.3 107:37.90 httpd
> 17620 b      20   0 92660  23m  11m S 1003  0.2  10:55.03 httpd
> 14025 b      20   0 92000  28m  16m S  720  0.2  51:49.49 httpd
>  3808 nobody    20   0 3013m 2.9g  592 S  714 24.7 343030:50 memcached
>   10 root     15  -5     0    0    0 S  714  0.0  11881:28 ksoftirqd/3
> 18487 b      20   0 91416  20m 9572 S  580  0.2   8:29.20 httpd
> 13252 b      20   0 93408  30m  17m S  580  0.3  45:19.69 httpd
> 17525 b      20   0 93208  23m  10m S  566  0.2  18:34.40 httpd
> 14760 b      20   0 93452  28m  15m S  534  0.2  57:34.65 httpd
>  3804 nobody    20   0 2995m 2.9g  592 S  441 24.6 378908:26 memcached
> 12209 b      20   0 92312  28m  16m S  279  0.2  63:28.45 httpd
>
>
>
> %CPU is 4308 here and it's not the highest value.
> i havent seen that on any previous kernel on the same server.
>
> should i upgrade procps or downgrade kernel then to get proper values back? :)
> or is it a feature of the new kernel?
>
> thank you
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Hi,

It really depends on what your box is doing at the time you capture
the cpu usage.
And it really depends too of your kernel config...
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