linux-kernel - Re: Direct I/O bug in kernel

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Message-ID: <CAJd=RBA=gdh-9aSeNGSu=BMNgVAWOKNy_yL7sJPUUpyee5VBjQ@mail.gmail.com>
Date:	Fri, 10 Aug 2012 20:18:22 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Victor Meyerson <calculuspenguin@...oo.com>
Cc:	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Direct I/O bug in kernel

On Fri, Aug 10, 2012 at 4:53 AM, Victor Meyerson
<calculuspenguin@...oo.com> wrote:
> I tried that patch, although I had to edit a slightly different line as dio_bio_alloc was near line 392 instead of 349 in the version of fs/direct-io.c in my tree.  I still got different checksums between the two files and even different checksums from my earlier attempts.
>
> I am not sure if this helps, but Ralf asked if I can try a different page size to see if this problem occurs.  I originally had CONFIG_PAGE_SIZE_4KB=y and changed it to CONFIG_PAGE_SIZE_16KB=y (via menuconfig).  Having a page size of 16KB (and the above patch not applied) made the checksum on the files match each other and match the file made from the working kernel.
>

Thanks for tests, Victor.

Please elaborate on the role of page size in this case, Ralf.

Good Weekend
Hillf
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