Re: Debugging new HW XOR engine driver

[tirumalareddy marri <tirumalareddymarri@yahoo.com>]

I am able to create a disk size of 40MB and mount it(mkfs.ext3 -b 4096 /dev/md0 10000). I was able to copy files to this mounted disk and read them back. If I increased the size more than 40MB file system if failing to mount.
  Is it possible that data I have read/write was in page cache and never really written to Hard Disks  ? Is it safe to say RAID-5 is partially working ?
Thanks,
Marri


----- Original Message ----
From: tirumalareddy marri <tirumalareddymarri@yahoo.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: thomas62186218@aol.com; linux-raid@vger.kernel.org
Sent: Tuesday, July 15, 2008 1:19:55 PM
Subject: Re: Debugging new HW XOR engine driver

Hi Dan,
  440SPe was my refence driver . I am working new SOC with some modifications to XOR engines. I have most of the stuff working like ADMA and XOR(tested one block of data). When I use ADMA and SW XOR(with out HW XOR) RAID-5 works fine.    When combined ADMA + XOR , having issues.  When I create a file system and try to mount it fails. Which could be becasue of some state problem in XOR calculations.
Is there any document about how  full stripe write, partial stripe writes and recovery  works in MD driver ?
Thanks,
Marri
  
 


----- Original Message ----
From: Dan Williams <dan.j.williams@intel.com>
To: tirumalareddy marri <tirumalareddymarri@yahoo.com>
Cc: thomas62186218@aol.com; linux-raid@vger.kernel.org
Sent: Tuesday, July 15, 2008 11:34:48 AM
Subject: Re: Debugging new HW XOR engine driver

On Tue, Jul 15, 2008 at 9:59 AM, tirumalareddy marri
<tirumalareddymarri@yahoo.com> wrote:
> I am working AMCC powerPC based SoC. It has XOR engine built in the HW.

Is this related to the driver started here?

[PATCH] [PPC32]  ADMA support for PPC 440SPe processors.
http://marc.info/?l=linux-raid&m=117400143317440&w=2

If so, that may be a better starting point.

--
Dan
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