linux-ext4 - Re: 64k Page size + ext3 errors

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Date:	Mon, 28 Jul 2008 16:29:23 -0700 (PDT)
From:	tirumalareddy marri <tirumalareddymarri@...oo.com>
To:	sandeen@...deen.net
Cc:	linux-raid@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: 64k Page size + ext3 errors

Hi Eric,
    This is PowerPC architecture from AMCC(I work for AMCC). I am using 2.6.25 Kernel. According your suggestion I tested with out RAID I did not see any EXT-3 errors. I use "sum" command to check the data integrity of the files. 
I ported ADMA driver to do HW accelerated XOR calculations . Also please note that RAID-5 works with 4K Page size.
Thanks,
Marri

----- Original Message ----
From: "sandeen@...deen.net" <sandeen@...deen.net>
To: tirumalareddy marri <tirumalareddymarri@...oo.com>
Cc: linux-raid@...r.kernel.org; linux-ext4@...r.kernel.org
Sent: Sunday, July 27, 2008 6:52:05 PM
Subject: Re: 64k Page size + ext3 errors

> I am using HW accelerated XOR engine for RAID-5 . I am seeing EXT3-fs
> errors when I use 64K page size. When I use 4K page size I don't see any
> issue. As many of you know, we will get better performance when we store
> bigger files like videos.

Do you think it is specific to the filesystem on raid-5?  Have you tested
w/o md?  I'd be a little surprised if the problem is at the raid layer (so
cc'ing the ext3/4 list), but maybe you tested that already.

Which arch is it, and which kernel?  How big is the filesystem?  With full
geometry information it might be easier for someone to reproduce & debug.

Thanks,
-Eric

> When I copy 128MB size files using 64k page size no issues seen. When I
> tried to copy 1.8 GB file with 64KB page size support I am seeing the
> following errors. Any clue what could be wrong.
>  
> Errors 1:
> EXT3-fs error (device md0): ext3_new_block: Allocating block in system
> zone - blocks from 65533, length 1
> EXT3-fs error (device md0): ext3_new_block: Allocating block in system
> zone - blocks from 65534, length 1
>  
>  
> Errors2:
> EXT3-fs error (device md0): ext3_readdir: bad entry in directory #2:
> rec_len % 4 != 0 - offset=0, inode=3040
>
>  
> Thanks in Advance,
> Marri
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