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DateThu, 10 Jan 2002 11:22:25 +0100
FromJens Axboe <>
SubjectRe: [PATCH] PAGE_SIZE IO for RAW (RAW VARY)
On Thu, Jan 10 2002, Andrea Arcangeli wrote:
> On Wed, Jan 09, 2002 at 11:28:39AM -0800, Badari Pulavarty wrote:
> > Ben,
> > 
> > By any chance do you have a list of drivers that assume this ? 
> > What does it take to fix them ? 
> > 
> > I think Jens BIO changes for 2.5 will fix this problem. But 
> > 2.4 needs a solution in this area too. This patch showed 
> > significant improvement for database workloads. 
> 
> I didn't checked the implementation but as far as the blkdev is
> concerned the b_size changes without notification as soon as you 'mkfs
> -b somethingelse' and then mount the fs. So it cannot break as far I can
> tell. The only important thing is that b_size stays between 512 and 4k.

The concern is/was differently sized buffer_heads in the same request,
ie b_size changing as you iterate through the chunks of one request.

-- 
Jens Axboe

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