Date: Wed, 13 Mar 2013 15:03:55 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com>, arch@freebsd.org Subject: Re: Unmapped buffers: to be merged in several days Message-ID: <1164735347.20130313150355@serebryakov.spb.ru> In-Reply-To: <14310571813.20130313150228@serebryakov.spb.ru> References: <20130311091852.GR3794@kib.kiev.ua> <86k3pe1cl3.fsf@ds4.des.no> <20130311182454.GX3794@kib.kiev.ua> <329178079.20130312010425@serebryakov.spb.ru> <20130311211158.GE3794@kib.kiev.ua> <14310571813.20130313150228@serebryakov.spb.ru>
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Hello, Lev. You wrote 13 =CD=C1=D2=D4=C1 2013 =C7., 15:02:28: >>> Will GEOM class, which needs to touch data (like raid3 or my off-tree >>> raid5), benefit from conversion, compare to generic mechanism, >>> provided for not-converted by your patch? KB>> First, what do you mean by 'benefit'. Answer would obviously depend KB>> on the criteria. LS> One more thought: it seems, that raid3/raid5 software implementations LS> could benefit on reading when strict checks are disabled. Is it LS> possible to map downstream BIOs, but use upstream ones unmapped? Where could I see documentation/examples how to: (a) manually map unmapped BIO (b) create unmapped BIO to pass downstream --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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