Date: Mon, 20 Sep 2010 01:12:32 -0400 From: jhell <jhell@DataIX.net> To: David Xu <davidxu@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: sysctl -a is slow Message-ID: <4C96ED40.7070206@DataIX.net> In-Reply-To: <4C961009.6080609@freebsd.org> References: <4C961009.6080609@freebsd.org>
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On 09/19/2010 09:28, David Xu wrote: > just typed sysctl -a on keyboard, and found it is slow, sometimes > it has been stuck for a few seconds, further studied,I found it is > stucked at sysctl kern.geom: > > %/usr/bin/time sysctl -a kern.geom > kern.geom.collectstats: 1 > kern.geom.debugflags: 0 > kern.geom.label.debug: 0 > kern.geom.label.ext2fs.enable: 1 > kern.geom.label.iso9660.enable: 1 > kern.geom.label.msdosfs.enable: 1 > kern.geom.label.ntfs.enable: 1 > kern.geom.label.reiserfs.enable: 1 > kern.geom.label.ufs.enable: 1 > kern.geom.label.ufsid.enable: 1 > kern.geom.label.gptid.enable: 1 > kern.geom.label.gpt.enable: 1 > 2.01 real 0.00 user 0.00 sys > > it seems it needs more than 2 seconds to complete. > A ktrace(1) and a kdump(1) of the resulting ktrace.out file would probably help here along with uname -a. Ive seen this happen once before but do not recall what caused it. Regards & good luck, -- jhell,v
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