From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: scameron@beardog.cce.hp.com
Cc: linux-scsi@vger.kernel.org, James.Bottomley@suse.de, axboe@kernel.dk
Subject: Re: Maximum data size in a single transfer for MS driver
Date: Thu, 25 Feb 2010 12:28:03 -0500 [thread overview]
Message-ID: <yq1vddlkyxo.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <20100225171826.GC30797@beardog.cce.hp.com> (scameron@beardog.cce.hp.com's message of "Thu, 25 Feb 2010 11:18:26 -0600")
>>>>> "scameron" == scameron <scameron@beardog.cce.hp.com> writes:
scameron> BLK_DEF_MAX_SECTORS seems to act as a cap, as a MAXIMUM
scameron> possible value for q->limits->max_sectors in blk_queue_max_sectors,
scameron> but as a MINIMUM for q->limits.max_hw_sectors in
scameron> blk_queue_max_hw_sectors.
Please read the entire thread.
blk_queue_max_hw_sectors() is dead, it was never used except briefly by
DM. Device drivers should use blk_queue_max_sectors() to set their hard
limit.
max_sectors is a block layer soft limit that can be overridden on a
per-device basis in /sys/block/foo/queue/max_sectors_kb.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2010-02-25 17:29 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-25 16:59 Maximum data size in a single transfer for MS driver scameron
2010-02-25 17:00 ` scameron
2010-02-25 17:18 ` scameron
2010-02-25 17:28 ` Martin K. Petersen [this message]
2010-02-25 17:41 ` Boaz Harrosh
2010-02-25 17:58 ` Martin K. Petersen
2010-02-25 19:07 ` Martin K. Petersen
-- strict thread matches above, loose matches on Subject: below --
2010-02-17 12:37 Ramya Desai
[not found] ` <3e7aae31002170437i52ba4ba1w10c1ff224d9b37ef-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-17 15:02 ` James Bottomley
2010-02-18 8:46 ` Ramya Desai
2010-02-18 15:47 ` James Bottomley
[not found] ` <1266508049.4355.37.camel-0iu6Cu4xQGLYCGPCin2YbQ@public.gmane.org>
2010-02-18 16:24 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1002181115120.1294-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-02-18 16:30 ` James Bottomley
[not found] ` <1266510627.4355.41.camel-0iu6Cu4xQGLYCGPCin2YbQ@public.gmane.org>
2010-02-18 16:51 ` Alan Stern
2010-02-19 12:43 ` Ramya Desai
2010-02-19 14:26 ` James Bottomley
2010-02-22 12:50 ` Ramya Desai
[not found] ` <3e7aae31002220450o6f83d2f3n45c795d70ef01f72-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-22 13:06 ` James Bottomley
2010-02-22 14:15 ` Ramya Desai
2010-02-22 17:44 ` Alan Stern
2010-02-22 18:07 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1002221232160.1251-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-02-23 15:29 ` Ramya Desai
2010-02-23 16:49 ` Alan Stern
2010-02-23 17:00 ` Martin K. Petersen
2010-02-23 18:01 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1002231253320.1308-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-02-24 13:07 ` Ramya Desai
2010-02-24 13:12 ` Jens Axboe
2010-02-24 16:30 ` Alan Stern
2010-02-24 19:07 ` Jens Axboe
2010-02-25 14:47 ` Ramya Desai
2010-02-25 14:44 ` Ramya Desai
2010-02-25 16:37 ` Alan Stern
2010-02-25 16:49 ` Martin K. Petersen
2010-02-25 16:53 ` Martin K. Petersen
2010-02-25 17:54 ` Jens Axboe
[not found] ` <yq1zl2xl0j3.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2010-02-25 18:28 ` Alan Stern
2010-02-25 19:05 ` Martin K. Petersen
[not found] ` <yq1iq9lkueh.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2010-02-25 19:47 ` Alan Stern
2010-02-26 3:37 ` Martin K. Petersen
[not found] ` <Pine.LNX.4.44L0.1002251132170.1686-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2010-02-25 17:52 ` Jens Axboe
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