Date: Fri, 2 Dec 2011 12:42:52 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Kirk McKusick <mckusick@mckusick.com> Cc: freebsd-fs@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org> Subject: Re: Does UFS2 send BIO_FLUSH to GEOM when update metadata (with softupdates)? Message-ID: <12310118271.20111202124252@serebryakov.spb.ru> In-Reply-To: <201112020236.pB22aQi6059579@chez.mckusick.com> References: <20111125110235.GB1642@garage.freebsd.pl> <201112020236.pB22aQi6059579@chez.mckusick.com>
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Hello, Kirk. You wrote 2 декабря 2011 г., 6:36:26: > The one place where a synchronous write (bwrite) is used is when the > completion of a particular I/O is needed to make progress on many other > things (usually an update to the SUJ log) in which case SU will force a > flush on that I/O (e.g., bwrite it) to hasten it along. So, it will be great, if SU will mark such writes additionally :) It could help sometimes -- even if lower layers will not lie about complete writes, it looks that SUJ could work better if such really-critical writes will not delayed at all (even for 30 seconds, which are Ok for all pother SU writes, as you stated earlier). -- // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>home | help
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