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Date: Thu, 01 Nov 2007 03:35:46 +0300
From: Alex Tomas <bzzz.tomas@...il.com>
To: Eric Sandeen <sandeen@...hat.com>
Cc: Andreas Dilger <adilger@....COM>,
ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: delalloc fragmenting files?
please, try the patch attached.
thanks, Alex
Eric Sandeen wrote:
> One thing that seems to be happening is that thanks to delalloc, a nice
> big request is coming in (only 1036 blocks of the 4096, not quite sure
> why), but then it gets into ext4_mb_normalize_request(), which finds the
> most blocks it can "preallocate" is 256, and chops down the request to
> 256 blocks. Shouldn't this preallocation be over & above what was asked
> for, vs. reducing the request?
>
> Ok, so, we get allocations in 256-block chunks... Why they don't all
> come out contiguous, I don't know yet...
>
> -Eric
View attachment "mballoc-debug.patch" of type "text/x-patch" (902 bytes)
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