Date: Thu, 12 Sep 2013 13:27:37 +0400 From: Gleb Smirnoff <glebius@FreeBSD.org> To: hiren panchasara <hiren.panchasara@gmail.com> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: Intermittent hangs in vmem_periodic() Message-ID: <20130912092737.GC4574@FreeBSD.org> In-Reply-To: <CALCpEUGherrJbmW9PBO7kSQk1Gj4zigGvvsRiyAwjk-USOXTUw@mail.gmail.com> References: <CALCpEUGherrJbmW9PBO7kSQk1Gj4zigGvvsRiyAwjk-USOXTUw@mail.gmail.com>
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On Wed, Sep 11, 2013 at 09:51:16PM -0700, hiren panchasara wrote: h> I am seeing really weird system freeze for 2-3 seconds every minute or so. h> h> % uname -a h> FreeBSD flymockour-l7.corp.yahoo.com 10.0-CURRENT FreeBSD 10.0-CURRENT #2 h> r255423M: Mon Sep 9 12:29:22 PDT 2013 root@flymocko h> ur-l7.corp.yahoo.com:/usr/obj/usr/home/hirenp/head/sys/GENERIC amd64 h> h> Simple comands like "man top" hangs and this is what I see in ctrl+T h> % man top h> load: 1.59 cmd: zcat 76574 [*kmem arena] 2.16r 0.00u 1.82s 16% 2000k h> load: 1.70 cmd: zcat 76574 [*kmem arena] 7.19r 0.00u 1.82s 7% 2000k h> load: 1.89 cmd: zcat 76574 [*kmem arena] 12.58r 0.00u 1.82s 3% 2000k h> load: 1.90 cmd: zcat 76574 [*kmem arena] 14.58r 0.00u 1.82s 2% 2000k h> h> I see similar things while trying to "exit" a terminal window. h> h> I see following in pmcstat: h> h> PMC: [INSTR_RETIRED_ANY] Samples: 117647 (100.0%) , 6885 unresolved h> h> %SAMP CALLTREE h> 75.9 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked h> vmem_periodic(75.9%) You probably got DIAGNOSTIC in your kernel config. -- Totus tuus, Glebius.
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