Date: Tue, 7 Oct 2003 17:02:31 +0100 From: Bruce M Simpson <bms@spc.org> To: Ben Mesander <ben@timing.com> Cc: arch@freebsd.org Subject: Re: Alignment of disk-I/O from userland. Message-ID: <20031007160231.GB73063@saboteur.dek.spc.org> In-Reply-To: <16258.56989.685473.900678@piglet.timing.com> References: <200310061753.28562.sam@errno.com> <32324.1065508157@critter.freebsd.dk> <16258.56989.685473.900678@piglet.timing.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Oct 07, 2003 at 09:41:17AM -0600, Ben Mesander wrote: > How about a flag for open(2), such as O_DIRECT, which would indicate > if the fd in question is such a device, and you did not sufficiently > align, etc. your buffers, then you get an error when you attempt the > I/O operation. O_DIRECT is already used to indicate that the application wishes to bypass the buffer cache. I think Scott's proposal, that the busdma API gets re-used, creating bounce buffers where necessary, makes sense. I think that if phk intends to 'raise the bar', he'd better be buying the drinks at EuroBSDCon. :-) BMS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20031007160231.GB73063>