Hi, On Tue, Feb 06, 2001 at 07:25:19PM -0500, Ingo Molnar wrote: > > On Wed, 7 Feb 2001, Stephen C. Tweedie wrote: > > > No, it is a problem of the ll_rw_block interface: buffer_heads need to > > be aligned on disk at a multiple of their buffer size. Under the Unix > > raw IO interface it is perfectly legal to begin a 128kB IO at offset > > 512 bytes into a device. > > then we should either fix this limitation, or the raw IO code should split > the request up into several, variable-size bhs, so that the range is > filled out optimally with aligned bhs. That gets us from 512-byte blocks to 4k, but no more (ll_rw_block enforces a single blocksize on all requests but that relaxing that requirement is no big deal). Buffer_heads can't deal with data which spans more than a page right now. --Stephen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Linus Torvalds
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Martin Dalecki
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jens Axboe
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Linus Torvalds
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Mikulas Patocka
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Stephen C. Tweedie
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Pavel Machek
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jens Axboe
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Stephen C. Tweedie
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Ingo Molnar
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Stephen C. Tweedie
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jeff V. Merkey
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Linus Torvalds
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jeff V. Merkey
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Ingo Molnar
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jeff V. Merkey
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jens Axboe
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jeff V. Merkey
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Ingo Molnar
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Jens Axboe
- Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound e... Ingo Molnar