----- Original Message ----- > From: Hillf Danton <dhillf@xxxxxxxxx> > To: Victor Meyerson <calculuspenguin@xxxxxxxxx> > Cc: "linux-mips@xxxxxxxxxxxxxx" <linux-mips@xxxxxxxxxxxxxx>; Ralf Baechle <ralf@xxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx> > 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@xxxxxxxxx> 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
