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From: Mike Christie <michaelc@cs.wisc.edu>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
	linux-scsi <linux-scsi@vger.kernel.org>
Subject: Re: Actually using the sg table/chain code
Date: Fri, 22 Feb 2008 10:13:45 -0600	[thread overview]
Message-ID: <47BEF4B9.2010401@cs.wisc.edu> (raw)
In-Reply-To: <1200498475.3136.9.camel@localhost.localdomain>

James Bottomley wrote:
> Yes, I can buy the argument for filesystem I/Os.  What about tapes which
> currently use the block queue and have internal home grown stuff to
> handle larger transfers ... how are they supposed to set the larger
> default sector size?  Just modify the bare q->max_sectors?
> 

Sorry for the late response. I have been doing userspace stuff and not 
keeping up with linux-scsi :(

For scsi tape and passthrough (any place we use REQ_TYPE_BLOCK_PC like 
with st or sg or block/scsi_ioctl or bsg), the block/bio/scatterlist 
building code ignores q->max_sectors and uses q->max_hw_sectors.

      parent reply	other threads:[~2008-02-22 16:14 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-15 15:52 Actually using the sg table/chain code James Bottomley
2008-01-15 16:09 ` Boaz Harrosh
2008-01-15 16:49   ` James Bottomley
2008-01-15 17:35     ` Boaz Harrosh
2008-01-16 14:01       ` Boaz Harrosh
2008-01-16 15:09         ` James Bottomley
2008-01-16 16:11           ` Boaz Harrosh
2008-01-16 16:37             ` Boaz Harrosh
2008-01-16 16:46               ` James Bottomley
2008-01-15 19:52 ` Jeff Garzik
2008-01-15 20:14   ` James Bottomley
2008-01-16 15:06 ` Jens Axboe
2008-01-16 15:47   ` James Bottomley
2008-01-16 16:08     ` Jens Axboe
2008-02-22 16:13     ` Mike Christie [this message]

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