Date: Sun, 16 May 2004 12:04:41 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Scott Long <scottl@freebsd.org> Cc: Michael Hamburg <hamburg@fas.harvard.edu> Subject: Re: fsck in -current Message-ID: <20040516170441.GA80376@dan.emsphone.com> In-Reply-To: <40A79A54.3090703@freebsd.org> References: <20040515220258.H920@ganymede.hub.org> <D3AE316C-A6D9-11D8-89DA-0003939A19AA@fas.harvard.edu> <20040515233728.Q30269@ganymede.hub.org> <FA17DF77-A6FB-11D8-89DA-0003939A19AA@fas.harvard.edu> <20040516163039.GE29158@dan.emsphone.com> <40A79A54.3090703@freebsd.org>
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In the last episode (May 16), Scott Long said: > Actually, bgfsck unconditionally inserts a delay into every 8th i/o > operation to try to keep from saturating the disks. Unfortunately > this isn't terribly sophisticated and it results in bgfsck taking an > eternity whether the system is idle, loaded, or reniced. See http://dan.allantgroup.com/FreeBSD/fsck_ffs.diff for a patch that removes the delay if it's at the minimum value, and more fairly calculates disk wait time. This cuts bgfsck time from ~4 hours to 20 minutes on my 36gb /usr. -- Dan Nelson dnelson@allantgroup.com
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