From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: Steven Scholz <steven.scholz@imc-berlin.de>, linux-ide@vger.kernel.org
Subject: Re: Impact of no_lba48{_dma} = 1 ?
Date: Wed, 07 Feb 2007 16:49:44 +0300 [thread overview]
Message-ID: <45C9D8F8.2000303@ru.mvista.com> (raw)
In-Reply-To: <20070207135309.66942d25@localhost.localdomain>
Hello.
Alan wrote:
>>>Only relevant for DMA really
>>So rqsize is only needed for DMA accesses?
Not really, it affects both PIO and DMA.
> PIO transfers are sector at a time, or multi-sector up to a usual limit
> of about 16 sectors.
You're clearly mixing 2 things here. PIO transfers are 1 sectors _per
interrupt_ or N (usually 16) sectors in the multiple mode. The ANSI specified
transfer limit is 256 for LBA28 (which fails on some drives), and 65536 with
LBA48 _per command_.
MBR, Sergei
next prev parent reply other threads:[~2007-02-07 13:49 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-07 9:56 Impact of no_lba48{_dma} = 1 ? Steven Scholz
2007-02-07 11:58 ` Alan
2007-02-07 13:25 ` Steven Scholz
2007-02-07 13:53 ` Alan
2007-02-07 13:49 ` Sergei Shtylyov [this message]
2007-02-07 14:11 ` Alan
2007-02-07 14:03 ` Steven Scholz
2007-02-07 14:19 ` Alan
2007-02-07 14:10 ` Sergei Shtylyov
2007-02-07 13:57 ` Steven Scholz
2007-02-07 14:09 ` Sergei Shtylyov
2007-02-07 14:16 ` Alan
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