Date: Fri, 27 May 2016 13:29:16 -0700 From: Conrad Meyer <cem@FreeBSD.org> To: Ravi Pokala <rpokala@mac.com> Cc: Doug Ambrisko <ambrisko@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r300866 - head/sys/boot/efi/libefi Message-ID: <CAG6CVpWHEF57FgT=T5Ln2cv-%2BN8jLyoKm_ioL1WcHK-Ae6cYmg@mail.gmail.com> In-Reply-To: <3EF68240-690E-44F9-957A-51BEDA0F35C8@panasas.com> References: <201605271923.u4RJNF0d016635@repo.freebsd.org> <3EF68240-690E-44F9-957A-51BEDA0F35C8@panasas.com>
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It seems he meant 'media native IO size', not 'media size'. I.e., on 4Kn media, 4k-multiple and -aligned IOs can be processed directly (but EFI's unit block size is still 512). Does that make sense? Best, Conrad On Fri, May 27, 2016 at 1:05 PM, Ravi Pokala <rpokala@mac.com> wrote: > -----Original Message----- > From: <owner-src-committers@freebsd.org> on behalf of Doug Ambrisko <ambrisko@FreeBSD.org> > Date: 2016-05-27, Friday at 12:23 > To: <src-committers@freebsd.org>, <svn-src-all@freebsd.org>, <svn-src-head@freebsd.org> > Subject: svn commit: r300866 - head/sys/boot/efi/libefi > >>Author: ambrisko >>Date: Fri May 27 19:23:15 2016 >>New Revision: 300866 >>URL: https://svnweb.freebsd.org/changeset/base/300866 >> >>Log: >> If the I/O offset and length is multiple of the media size then >> directly pass the request otherwise use a buffer that is a >> multiple of the media size. This speeds up I/O quite a bit >> when using large transfer sizes on 4Kn disks etc. >> >> MFC after: 1 week > > I/O offset and length are *divisors* of the media size, not *multiples* of it. > > -Ravi (rpokala@) > > > >
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