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From: Stefan Haberland <sth@linux.vnet.ibm.com>
To: keith.busch@intel.com, axboe@fb.com, torvalds@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
	Sebastian Ott <sebott@linux.vnet.ibm.com>
Subject: [BUG] Regression introduced with "block: split bios to max possible length"
Date: Thu, 21 Jan 2016 15:57:14 +0100	[thread overview]
Message-ID: <56A0F1CA.4010303@linux.vnet.ibm.com> (raw)

Hi,

unfortunately commit e36f62042880 "block: split bios to maxpossible length"
breaks the DASD driver on s390.  We expect the block requests to be multiple
of 4k in size. With the patch applied I see the requests split up in 
multiple
of 512 byte and therefore the requests get rejected and lots of I/Os fail.

Could you please fix or revert the patch?

We have following values set for the block queue:

hw_sector_size         4096
logical_block_size     4096
minimum_io_size        4096
physical_block_size    4096
max_hw_sectors_kb       760
max_sectors_kb          760
max_segment_size       4096
max_segments          65535

Regards,
Stefan

             reply	other threads:[~2016-01-21 14:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-21 14:57 Stefan Haberland [this message]
2016-01-21 21:34 ` [BUG] Regression introduced with "block: split bios to max possible length" Jens Axboe
2016-01-21 21:34   ` Jens Axboe
2016-01-21 22:51   ` Keith Busch
2016-01-22  1:12     ` Linus Torvalds
2016-01-22  3:21       ` Keith Busch
2016-01-22  4:15         ` Linus Torvalds
2016-01-22 14:56           ` Keith Busch
2016-01-22 17:15             ` Jens Axboe
2016-01-22 15:06           ` Ming Lei
2016-01-22 17:03             ` Linus Torvalds
2016-01-22 17:48               ` Ming Lei

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