Messages in this thread | | | Date | Mon, 16 Feb 2009 18:38:00 +0900 | Subject | Re: [PATCH 1/8] exofs: Kbuild, Headers and osd utils | From | FUJITA Tomonori <> |
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On Mon, 16 Feb 2009 11:19:21 +0200 Boaz Harrosh <bharrosh@panasas.com> wrote:
> >> Also looking > >> ahead I will have RAID 0, 1, 5, and 6 on objects of different devices. bio > >> is the perfect collector for memory information in this situation. > > > > You will add such features to exofs, handling multiple devices > > internally? > > > > Multiple objects on Multiple devices, Yes.
I thought that exofs is kinda example (reference) file system.
Nobody has seen your code. Let's discuss when we have the code. Over-designing for what we've not seen is not a good idea.
> >> exofs is not the first and only file system who is using bios. Proof of > >> the matter is that block exports a bio submit routine. > > > > Seems that exofs just passes pages and the ULD sends a SCSI command > > including these pages. I don't see how exofs needs to handle bio > > directly. > > > > How do you propose to collect these pages? and keep them without allocating > an extra list? without pre-allocating a struct request? and without re-inventing > the bio structure?
I don't think that allocating an extra list (or something) to keep them hurts performance. We can talk about it when you have the real performance results.
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