From: Rusty Russell <rusty@rustcorp.com.au>
To: David Woodhouse <dwmw2@infradead.org>
Cc: linux-kernel@vger.kernel.org, matthew@wil.cx, davem@redhat.com
Subject: Re: When should we use likely() / unlikely() / get_unaligned() ?
Date: Mon, 09 Feb 2004 10:00:47 +1100 [thread overview]
Message-ID: <20040208230331.79FEB2C003@lists.samba.org> (raw)
In-Reply-To: Your message of "Sun, 08 Feb 2004 11:13:53 -0000." <1076238833.12587.229.camel@imladris.demon.co.uk>
In message <1076238833.12587.229.camel@imladris.demon.co.uk> you write:
> To be honest, I'm more interested in the case of get_unaligned(). The
> principle is fairly similar -- the ratio between the performance of the
> inline and the exception cases varies wildly from architecture to
> architecture. But the range is far wider -- we now support architectures
> in 2.6 where alignment fixups _cannot_ happen, and the cost of the
> 'exception' case should be considered infinite.
Um, we do? I thought it was compulsory in the kernel, otherwise
networking breaks on packets w/ wierd hardware headers.
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
next prev parent reply other threads:[~2004-02-08 23:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-06 11:06 David Woodhouse
2004-02-08 10:43 ` Rusty Russell
2004-02-08 11:13 ` David Woodhouse
2004-02-08 23:00 ` Rusty Russell [this message]
2004-02-08 23:06 ` David Woodhouse
2004-02-08 23:11 ` David S. Miller
2004-02-08 23:14 ` David Woodhouse
2004-02-16 11:39 ` Pavel Machek
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