From: Benjamin LaHaise <ben.lahaise@neterion.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: netdev@vger.kernel.org
Subject: Re: [0/14] GRO: Lots of microoptimisations
Date: Fri, 12 Jun 2009 12:09:26 -0400 [thread overview]
Message-ID: <20090612160926.GA4290@neterion.com> (raw)
In-Reply-To: <20090610054449.GB16984@gondor.apana.org.au>
On Wed, Jun 10, 2009 at 03:44:49PM +1000, Herbert Xu wrote:
> On Fri, May 29, 2009 at 12:23:13PM -0400, Benjamin LaHaise wrote:
> >
> > It's just being turned off by setting a loadable module option.
>
> Let me see if I can get my hands on a machine with your NIC.
I found at least one reason why: the first skb_shinfo()->frag_list touch
in dev_gro_receive() was causing a cache miss. Adding a prefetch in the
driver helps that a little bit, but there's still > 500Mbps difference.
I'd like to retest on a system with newer CPUs, but it will probably be a
few weeks until all the hardware is in the same place.
-ben
next prev parent reply other threads:[~2009-06-12 16:09 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-27 4:45 [0/14] GRO: Lots of microoptimisations Herbert Xu
2009-05-27 4:50 ` [PATCH 1/14] gro: Open-code frags copy in skb_gro_receive Herbert Xu
2009-05-27 4:50 ` [PATCH 2/14] gro: Inline skb_gro_header and cache frag0 virtual address Herbert Xu
2009-05-27 4:50 ` [PATCH 3/14] gro: Localise offset/headlen in skb_gro_offset Herbert Xu
2009-05-27 4:50 ` [PATCH 4/14] gro: Only use skb_gro_header for completely non-linear packets Herbert Xu
2009-05-27 4:50 ` [PATCH 5/14] tcp: Optimise GRO port comparisons Herbert Xu
2009-05-27 4:50 ` [PATCH 6/14] tcp: Remove unnecessary window comparisons for GRO Herbert Xu
2009-05-27 4:50 ` [PATCH 7/14] tcp: Optimise len/mss comparison Herbert Xu
2009-05-27 4:50 ` [PATCH 8/14] gro: Optimise length comparison in skb_gro_header Herbert Xu
2009-05-27 4:50 ` [PATCH 9/14] gro: Avoid unnecessary comparison after skb_gro_header Herbert Xu
2009-05-27 4:50 ` [PATCH 10/14] ipv4: Use 32-bit loads for ID and length in GRO Herbert Xu
2009-05-27 18:00 ` Andi Kleen
2009-05-27 21:26 ` Herbert Xu
2009-05-27 4:50 ` [PATCH 11/14] gro: Open-code final pskb_may_pull Herbert Xu
2009-05-27 4:50 ` [PATCH 12/14] gro: Nasty optimisations for page frags in skb_gro_receive Herbert Xu
2009-05-27 4:50 ` [PATCH 13/14] gro: Store shinfo in local variable " Herbert Xu
2009-05-27 4:50 ` [PATCH 14/14] tcp: Do not check flush when comparing options for GRO Herbert Xu
2009-05-27 10:42 ` [0/14] GRO: Lots of microoptimisations David Miller
2009-05-27 17:52 ` Benjamin LaHaise
2009-05-27 23:08 ` Herbert Xu
2009-05-28 15:21 ` Benjamin LaHaise
2009-05-29 9:28 ` Herbert Xu
2009-05-29 9:29 ` Herbert Xu
2009-05-29 16:23 ` Benjamin LaHaise
2009-06-10 5:44 ` Herbert Xu
2009-06-12 16:09 ` Benjamin LaHaise [this message]
2009-06-12 23:48 ` David Miller
2009-06-16 16:35 ` Benjamin LaHaise
2009-06-16 16:38 ` Herbert Xu
2009-06-17 8:07 ` Herbert Xu
2009-06-17 8:08 ` Herbert Xu
2009-06-17 20:14 ` Rick Jones
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