Messages in this thread | | | Date | Thu, 9 Aug 2012 13:53:14 -0700 (PDT) | From | Victor Meyerson <> | Subject | Re: Direct I/O bug in kernel |
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----- Original Message -----
> From: Hillf Danton <dhillf@gmail.com> > To: Victor Meyerson <calculuspenguin@yahoo.com> > Cc: "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>; Ralf Baechle <ralf@linux-mips.org>; LKML <linux-kernel@vger.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@yahoo.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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