Dear Dear Jens Axboe,
Thanks for your notification and advice.
Areca's firmware has max sg entries of 38 limit.
In my debug driver I had add this condition check.
But no one request more than 38 sg.
Both transfer length all have a lot of requests equal with 38 sg.
But why it ocur only at 4096 sectors?
If the /sys/block/sda/queue/max_sectors_kb equal 256 all operation running
well.
But if I modify it more than 256, the bug appeared.
I will do more research about why there were a lot of requests equal with
38 sg in all file system.
And only it ocur at the volume that format with mkfs.ext2.
Thanks again.
Best Regards
Erich Chen
----- Original Message -----
From: "Jens Axboe" <[email protected]>
To: "erich" <[email protected]>
Cc: <[email protected]>; <[email protected]>; "Al Viro"
<[email protected]>; "Andrew Morton" <[email protected]>; "Randy.Dunlap"
<[email protected]>; "Matti Aarnio" <[email protected]>;
<[email protected]>; "James Bottomley"
<[email protected]>; "Chris Caputo" <[email protected]>
Sent: Thursday, April 20, 2006 2:42 PM
Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken
On Thu, Apr 20 2006, erich wrote:
Dear Jens Axboe,
I do "fsck -fy /dev/sda1" on driver MAX_XFER_SECTORS 512.
The file system was not clean.
I attach mesg.txt for you refer to.
=====================================
== boot with driver MAX_XFER_SECTORS 4096
=====================================
#mkfs.ext2 /dev/sda1
#reboot
=====================================
== boot with driver MAX_XFER_SECTORS 512
=====================================
#fsck -fy /dev/sda1
/dev/sda1:clean,.............
#reboot
=====================================
== boot with driver MAX_XFER_SECTORS 4096
=====================================
#mount /dev/sda1 /mnt/sda1
#cp /root/aa /mnt/sda1
#reboot
=====================================
== boot with driver MAX_XFER_SECTORS 512
=====================================
#fsck -fy /dev/sda1
/dev/sda1: no clean,........and dump message such as the attach file
mesg.txt.
So the conclusion is that your driver and/or hardware corrupts data when
you set MAX_XFER_SECTORS too high. I can't help you anymore with this,
you should be in the best position to debug the driver and/or hardware
:-)
It could be that the higher setting just exposes another transfer
setting bug, like maximum number of segments or segment size, etc.
--
Jens Axboe
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