Messages in this thread |  | | Date | Tue, 05 Sep 2000 04:51:28 -0600 | From | "Jeff V. Merkey" <> | Subject | Re: [PATCH] 2.4.0-test7 to Enable Variable Block Chaining |
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Neil,
I think Linus knows this, and from what I've seen, it may break a ton of shit. I think folks need to let Linus know these issues. NT and NetWare both support variable length and offset sectors read/write requests. This fixed block size stuff is tough for non-Linux file systems like NTFS and NWFS.
Jeff
Neil Brown wrote: > > On Saturday September 2, jmerkey@timpanogas.com wrote: > > > > Linus, > > > > The attached patch is submitted to enable variable sector size block > > chaining via ll_rw_block() in the I/O subsystem layer. > > > > Jeff904a905,907 > > > /**** > > > // This code is being commented out to allow support for variable chained > > > // block I/O requests. Jeff V. Merkey > > 915a919 > > > *****/ > > While I think this patch is a good idea, I feel I should let you know > that using the functionality on a Software-RAID-5 device will cause > terrible performance. > Whenever raid5.c notices the block size has changed, it flushes it's > stripe cache, and rebuilds it with the new size. This effectively > serialises requests around any size change. > > Fixing this in on my todo list, but I haven't come up with a really > neat model yet. > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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