From: Andrew Morton <akpm@osdl.org>
To: Jari Ruusu <jari.ruusu@pp.inet.fi>
Cc: cfriesen@nortelnetworks.com, Andries.Brouwer@cwi.nl,
akpm@digeo.com, linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH] cryptoloop
Date: Fri, 4 Jul 2003 01:44:37 -0700 [thread overview]
Message-ID: <20030704014437.20a8d45e.akpm@osdl.org> (raw)
In-Reply-To: <3F05300E.AA26A021@pp.inet.fi>
Jari Ruusu <jari.ruusu@pp.inet.fi> wrote:
>
> Changing transfer function prototype may be a tiny speed improvement for one
> implementation that happens to use unoptimal API, but at same time be tiny
> speed degration to other implementations that use more saner APIs. I am
> unhappy with that change, because I happen to maintain four such transfers
> that would be subject to tiny speed degration.
Both the source and dest pages are being mapped with a sleeping kmap() at
present. This way we can stop doing that, which is a significant saving on
highmem and a more significant saving on SMP highmem. (crypto uses kmap_atomic).
Why is the loop driver taking a copy of all the pages btw? Looks to me
that we can just clone the bio and save an entire copy?
next prev parent reply other threads:[~2003-07-04 8:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-02 18:44 [PATCH] cryptoloop Andries.Brouwer
2003-07-02 19:02 ` Andrew Morton
2003-07-02 19:16 ` Linus Torvalds
2003-07-02 19:20 ` Andrew Morton
2003-07-02 19:31 ` Linus Torvalds
2003-07-03 11:21 ` Jari Ruusu
2003-07-03 15:20 ` Andrew Morton
2003-07-03 17:29 ` Jari Ruusu
2003-07-03 17:38 ` Chris Friesen
2003-07-04 7:43 ` Jari Ruusu
2003-07-04 8:44 ` Andrew Morton [this message]
2003-07-04 9:41 ` Christoph Hellwig
2003-07-05 8:41 ` Jari Ruusu
2003-07-05 8:58 ` Andrew Morton
2003-07-05 9:00 ` Andre Hedrick
2003-07-05 9:10 ` Andre Hedrick
2003-07-05 17:16 ` James Morris
2003-07-05 17:20 ` Linus Torvalds
2003-07-08 12:43 ` Christoph Hellwig
2003-07-04 9:39 ` Christoph Hellwig
2003-07-03 16:20 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2003-07-04 13:21 Andries.Brouwer
2003-07-04 13:28 ` Christoph Hellwig
2003-07-04 11:08 Andries.Brouwer
2003-07-04 12:13 ` Christoph Hellwig
2003-07-03 16:25 Andries.Brouwer
2003-07-03 16:31 ` Christoph Hellwig
2003-07-02 22:57 Andries.Brouwer
2003-07-02 22:27 Andries.Brouwer
2003-07-02 21:00 Andries.Brouwer
2003-07-02 21:06 ` Greg KH
2003-07-02 21:31 ` Andrew Morton
2003-07-03 16:23 ` Christoph Hellwig
2003-07-02 19:42 Andries.Brouwer
2003-07-02 19:58 ` Andrew Morton
2003-07-02 15:21 Andries.Brouwer
2003-07-02 17:16 ` Andrew Morton
2003-07-03 15:44 ` Christoph Hellwig
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