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Date: Thu, 4 Apr 2013 09:59:19 +0800 From: feng xiangjun <fengxj325@...il.com> To: linux-kernel@...r.kernel.org Subject: [v3.9][regression] a simple ' time vmstat 1 11 ' can takes up 25s+! Hi guys, I wonder if anyone see this problem. When running 3.9-rc3+, the system is very sluggish. For example, on an almost idle system, ~$ time vmstat 1 11 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 6046296 28716 1576096 0 0 1245 391 260 1034 11 3 72 15 4 0 0 6046172 28716 1576172 0 0 0 0 318 761 0 0 99 0 6 0 0 6049892 28716 1571844 0 0 0 28 439 1036 0 0 99 0 5 0 0 6049944 28716 1571844 0 0 0 0 265 717 0 0 99 0 2 0 0 6050016 28716 1571844 0 0 0 0 90 327 2 0 98 0 1 0 0 6049892 28716 1571848 0 0 0 0 60 126 1 0 99 0 0 0 0 6049892 28716 1571848 0 0 0 0 62 157 1 0 99 0 1 0 0 6049892 28716 1571848 0 0 0 0 66 127 1 0 99 0 0 0 0 6049892 28716 1571848 0 0 0 0 75 158 2 0 98 0 1 0 0 6049892 28716 1571848 0 0 0 0 59 124 1 0 100 0 0 0 0 6049892 28716 1571848 0 0 0 0 62 155 2 0 99 0 real 0m25.061s user 0m0.000s sys 0m0.000s It should be 10s. Dmesg and kernel config attached. It's a non preempt kernel(CONFIG_PREEMPT_NONE=y), maybe these days no one running non preempt on their system? I've not tried 3.9-rc1/rc2, will try to bisect this ... 3.8.x works fine. Download attachment "3.9.config.gz" of type "application/x-gzip" (16174 bytes) Download attachment "dmesg.gz" of type "application/x-gzip" (13825 bytes)
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