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>
next in thread | previous in thread | raw e-mail | index | archive | help
Hello, Kirk. You wrote 2 =E4=E5=EA=E0=E1=F0=FF 2011 =E3., 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). --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?12310118271.20111202124252>