Messages in this thread | | | Date | Thu, 8 Mar 2001 12:14:17 +0000 | From | "Stephen C. Tweedie" <> | Subject | Re: 64-bit capable block device layer |
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Hi,
On Wed, Mar 07, 2001 at 07:53:23PM +0100, Jens Axboe wrote: > > > > OTOH, I'm not sure what problems it could give to make this > > a compile-time option... > > Plus compile time options are nasty :-). It would probably make > bigger sense to completely skip all the merging etc for low end > machines. I think they already do this for embedded kernels (ie > removing ll_rw_blk.c and elevator.c). That avoids most of the > 64-bit arithmetic anyway.
It's not just a sector-number and ll_rw_blk/elevator issue. The limit goes all the way up to the users of the block device, be they the filesystem, buffer cache or block read/write layer.
This is especially true for filesystems like XFS which need a 512-byte blocksize. At least with ext2 you can set the blocksize to 4kB and get some of the benefit of larger block devices without having to overflow the 32-bit block number.
Cheers, Stephen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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