From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mark Lord <liml@rtr.ca>
Cc: Jeff Garzik <jgarzik@pobox.com>, Tejun Heo <htejun@gmail.com>,
Alan Cox <alan@redhat.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: libata .sg_tablesize: why always dividing by 2 ?
Date: Tue, 26 Feb 2008 13:52:03 +1100 [thread overview]
Message-ID: <1203994323.15052.79.camel@pasglop> (raw)
In-Reply-To: <47C36D64.6010001@rtr.ca>
> The block layer uses seg_boundary_mask to ensure that we never have
> to split them again in the LLD.
>
> A very long time ago, when I wrote the IDE DMA code, this was not the case.
Not good enough, still, because the boundaries can change due to the
iommu merging, thus the split must be re-done.
Ben.
next prev parent reply other threads:[~2008-02-26 2:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 0:02 libata .sg_tablesize: why always dividing by 2 ? Mark Lord
2008-02-26 0:15 ` Jeff Garzik
2008-02-26 0:27 ` Mark Lord
2008-02-26 0:54 ` Benjamin Herrenschmidt
2008-02-26 1:37 ` Mark Lord
2008-02-26 1:43 ` Mark Lord
2008-02-26 2:54 ` Benjamin Herrenschmidt
2008-02-26 4:38 ` Mark Lord
2008-02-26 5:30 ` Benjamin Herrenschmidt
2008-02-26 5:43 ` Mark Lord
2008-02-26 5:47 ` Benjamin Herrenschmidt
2008-02-26 16:09 ` James Bottomley
2008-02-26 21:43 ` Benjamin Herrenschmidt
2008-02-26 16:25 ` Mark Lord
2008-02-26 16:51 ` Mark Lord
2008-02-26 21:50 ` Benjamin Herrenschmidt
2008-02-26 21:56 ` James Bottomley
2008-02-26 22:30 ` Benjamin Herrenschmidt
2008-02-26 23:16 ` Benjamin Herrenschmidt
2008-02-26 21:43 ` Benjamin Herrenschmidt
2008-02-26 23:07 ` Alan Cox
2008-02-26 23:19 ` Benjamin Herrenschmidt
2008-02-28 7:36 ` FUJITA Tomonori
2008-02-28 7:44 ` Benjamin Herrenschmidt
2008-02-26 2:52 ` Benjamin Herrenschmidt [this message]
2008-02-26 0:22 ` Jeff Garzik
2008-02-26 0:28 ` Mark Lord
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