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Message-ID: <20100930173342.GB31945@redhat.com> Date: Thu, 30 Sep 2010 13:33:43 -0400 From: Mike Snitzer <snitzer@...hat.com> To: Eric Sandeen <sandeen@...hat.com> Cc: "Ted Ts'o" <tytso@....edu>, "Martin K. Petersen" <martin.petersen@...cle.com>, Jens Axboe <jaxboe@...ionio.com>, "James.Bottomley@...senpartnership.com" <James.Bottomley@...senpartnership.com>, "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org> Subject: Re: I/O topology fixes for big physical block size On Thu, Sep 30 2010 at 1:07pm -0400, Eric Sandeen <sandeen@...hat.com> wrote: > On 09/30/2010 11:30 AM, Ted Ts'o wrote: > > On Tue, Sep 28, 2010 at 04:36:42PM -0500, Eric Sandeen wrote: > >> Ok, then it sounds like mkfs.ext4's refusal to make fs blocksize less > >> than device physical sectorsize without -F is broken, and that should > >> be removed. I'd say issue a warning in the case but if there's a 16k > >> physical device maybe there's no point in warning either? > > > > If the device physical sectorsize is that big, should we perhaps use > > that as a hint to align writes to that blocks aligned with that > > physical sectorsize? Right now we use the optimal I/O size, but if > > the optimal I/O size is not specified and the physical sectorsize is, > > I can't keep track of all the parameters, is it ever true that optimal > I/O size isn't specified? Yes optimal_io_size may be 0. But minimum_io_size will always be scaled up to at least match physical_block_size. In any case: this 1MB physical_block_size device, which started this thread, also has 1MB for both minimum_io_size and optimal_io_size. Mike -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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