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

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Date:	Thu, 9 Aug 2012 13:53:14 -0700 (PDT)
From:	Victor Meyerson <calculuspenguin@...oo.com>
To:	Hillf Danton <dhillf@...il.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

----- Original Message -----

> 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>
> Sent: Friday, July 27, 2012 7:47 AM
> Subject: Re: Direct I/O bug in kernel
> 
> On Wed, Jul 25, 2012 at 1:28 AM, Victor Meyerson
> <calculuspenguin@...oo.com> wrote:
>> 
>>  Still different checksums and I used the same random-file from my first 
> test.
>> 
> Then try the fix at
>             https://lkml.org/lkml/2012/7/27/54
> 

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.

Victor

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