From: Herbert Xu <herbert@gondor.apana.org.au>
To: David Miller <davem@davemloft.net>
Cc: fujita.tomonori@lab.ntt.co.jp, akpm@linux-foundation.org,
linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org,
jens.axboe@oracle.com, tsbogend@alpha.franken.de,
bzolnier@gmail.com, James.Bottomley@HansenPartnership.com,
jeff@garzik.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/4] block: use ARCH_KMALLOC_MINALIGN as the default dma pad mask
Date: Thu, 22 May 2008 09:21:43 +0800 [thread overview]
Message-ID: <20080522012143.GA27975@gondor.apana.org.au> (raw)
In-Reply-To: <20080521.181945.27326326.davem@davemloft.net>
On Wed, May 21, 2008 at 06:19:45PM -0700, David Miller wrote:
>
> > Ok, so it's all about crypto hardware requirement. In other words, if
> > we accept for potential performance drop of crypto hardware, crypto
> > can drop this alignment.
>
> It sounds to me that Herbert is saying that the VIA crypto hardware
> will malfunction if not given an aligned address, rather than simply
> go more slowly.
Yes, in general hardware crypto that needs alignment requires it.
In VIA's case it will generate a GPF.
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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next prev parent reply other threads:[~2008-05-22 1:21 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1211259514-9131-1-git-send-email-fujita.tomonori@lab.ntt.co.jp>
[not found] ` <1211259514-9131-2-git-send-email-fujita.tomonori@lab.ntt.co.jp>
2008-05-20 9:31 ` Andrew Morton
2008-05-20 9:38 ` Herbert Xu
2008-05-20 9:52 ` Andrew Morton
2008-05-20 9:58 ` FUJITA Tomonori
2008-05-20 11:32 ` Herbert Xu
2008-05-20 13:25 ` FUJITA Tomonori
2008-05-20 15:34 ` Herbert Xu
2008-05-20 16:09 ` FUJITA Tomonori
2008-05-21 1:26 ` Herbert Xu
2008-05-21 1:36 ` FUJITA Tomonori
2008-05-21 3:16 ` Herbert Xu
2008-05-21 6:54 ` FUJITA Tomonori
2008-05-21 8:47 ` Herbert Xu
2008-05-21 9:34 ` FUJITA Tomonori
2008-05-21 10:05 ` Herbert Xu
2008-05-21 11:01 ` FUJITA Tomonori
2008-05-21 11:25 ` Herbert Xu
2008-05-21 12:09 ` FUJITA Tomonori
2008-05-21 12:22 ` Herbert Xu
2008-05-21 12:46 ` FUJITA Tomonori
2008-05-21 12:55 ` FUJITA Tomonori
2008-05-21 13:19 ` Herbert Xu
2008-05-21 13:18 ` Herbert Xu
2008-05-22 1:14 ` FUJITA Tomonori
2008-05-22 1:19 ` David Miller, FUJITA Tomonori
2008-05-22 1:21 ` Herbert Xu [this message]
2008-05-22 1:32 ` FUJITA Tomonori
2008-05-22 1:56 ` Herbert Xu
2008-05-20 9:55 ` Paul Mundt
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