From: David Miller <davem@davemloft.net>
To: johannes@sipsolutions.net
Cc: herbert@gondor.apana.org.au, dsd@gentoo.org,
netdev@vger.kernel.org, linux-wireless@vger.kernel.org
Subject: Re: wireless vs. alignment requirements
Date: Sat, 24 Nov 2007 05:51:15 -0800 (PST) [thread overview]
Message-ID: <20071124.055115.193713164.davem@davemloft.net> (raw)
In-Reply-To: <1195912176.4149.194.camel@johannes.berg>
From: Johannes Berg <johannes@sipsolutions.net>
Date: Sat, 24 Nov 2007 14:49:36 +0100
>
> On Sat, 2007-11-24 at 21:32 +0800, Herbert Xu wrote:
> > On Sat, Nov 24, 2007 at 09:33:36AM +0100, Johannes Berg wrote:
> > >
> > > We still require four-byte alignment, no?
> >
> > Not at all. If NET_IP_ALIGN is zero then it won't be four-byte
> > aligned (since the Ethernet header is 14 bytes long).
>
> Right. I just didn't think that would be a valid value for an
> architecture to set.
It is, and explicitly used by powerpc to get more of the
DMA transfers 64-byte aligned which is critical for
performance on some powerpc boxes.
next prev parent reply other threads:[~2007-11-24 13:51 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-23 0:09 [PATCH] add compare_ether_addr_unaligned Daniel Drake
2007-11-23 4:11 ` Stephen Hemminger
2007-11-23 13:26 ` Herbert Xu
2007-11-26 10:39 ` Herbert Xu
2007-11-23 20:33 ` wireless vs. alignment requirements Johannes Berg
[not found] ` <1195850001.4149.165.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-11-24 6:15 ` Herbert Xu
2007-11-24 8:33 ` Johannes Berg
2007-11-24 13:32 ` Herbert Xu
[not found] ` <20071124133200.GA27531-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-24 13:49 ` Johannes Berg
2007-11-24 13:51 ` David Miller [this message]
2007-11-24 14:13 ` Herbert Xu
[not found] ` <20071124141319.GA27819-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-24 20:11 ` Stephen Hemminger
[not found] ` <4748855C.5090103-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2007-11-24 21:33 ` Johannes Berg
2007-11-25 1:08 ` Herbert Xu
[not found] ` <20071125010814.GD31668-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-25 21:21 ` Stephen Hemminger
[not found] ` <4749E768.9040002-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2007-11-26 1:38 ` Herbert Xu
2007-11-27 17:16 ` H. Peter Anvin
2007-11-27 17:16 ` H. Peter Anvin
[not found] ` <474C50D7.5010901-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2007-11-27 18:39 ` Stephen Hemminger
[not found] ` <20071127103940.314c7844-s08KbqtN0aBORcJjwVk881hTQxXnIo14@public.gmane.org>
2007-11-28 2:42 ` H. Peter Anvin
2007-11-29 13:11 ` Herbert Xu
2007-11-29 17:50 ` H. Peter Anvin
2007-11-30 0:26 ` Herbert Xu
[not found] ` <20071130002621.GI23769-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-30 0:28 ` H. Peter Anvin
[not found] ` <474F5932.1030103-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2007-11-30 0:34 ` Herbert Xu
[not found] ` <20071130003426.GJ23769-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-30 0:41 ` H. Peter Anvin
2007-11-24 21:13 ` Johannes Berg
[not found] ` <1195938799.4149.197.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-11-25 1:44 ` Herbert Xu
[not found] ` <20071125014446.GA32104-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2007-11-25 11:00 ` Johannes Berg
[not found] ` <1195988428.4149.225.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-11-25 11:22 ` Herbert Xu
2007-11-25 13:54 ` Johannes Berg
[not found] ` <1195998864.4149.229.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-11-25 14:01 ` Herbert Xu
2007-11-25 17:04 ` Johannes Berg
[not found] ` <1196010257.4149.234.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-11-26 1:36 ` Herbert Xu
2007-11-24 13:11 ` Ulrich Kunitz
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