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Date: Mon, 28 Dec 2015 16:59:46 +0200
From: Petko Manolov <petkan@mip-labs.com>
Subject: Re: [Linux-ima-devel] [PATCH v2 4/7] ima: measure and appraise kexec
 image and initramfs
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To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: David Woodhouse <dwmw2@infradead.org>, "Luis R. Rodriguez" <mcgrof@suse.com>, kexec@lists.infradead.org, David Howells <dhowells@redhat.com>, linux-security-module@vger.kernel.org, linux-ima-devel@lists.sourceforge.net, Dave Young <dyoung@redhat.com>, Vivek Goyal <vgoyal@redhat.com>

On 15-12-28 09:42:22, Mimi Zohar wrote:
> On Mon, 2015-12-28 at 16:29 +0200, Petko Manolov wrote:
> > 
> > I kind of wonder isn't it possible to optimize the file read?  If the file 
> > is relatively small (a few megabytes, for example) it will fit into any 
> > modern system's memory.  At least those that cares to run IMA, i mean.
> > 
> > Fetching file page by page is a slow process even though the BIO subsystem 
> > reads larger chunks off the real storage devices.  Has anyone done a 
> > benchmark test?
> 
> Dmitry recently added asynchronous hash (ahash) support, which allows HW 
> crypto acceleration, for calculating the file hash.

This is nice.  However, i was referring to reading a file page by page vs larger 
(a couple of megabytes) chunks.  Is this also covered by the ahash support?


cheers,
Petko

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