From patchwork Tue May 1 02:07:09 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 156003 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 5BC0AB6F9F for ; Tue, 1 May 2012 12:07:19 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757570Ab2EACHQ (ORCPT ); Mon, 30 Apr 2012 22:07:16 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:33377 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751881Ab2EACHP (ORCPT ); Mon, 30 Apr 2012 22:07:15 -0400 Received: by wejx9 with SMTP id x9so2143462wej.19 for ; Mon, 30 Apr 2012 19:07:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:from:to:cc:content-type:date:message-id:mime-version :x-mailer:content-transfer-encoding; bh=rwPxMcBu/c8GYYMbzbcOwOQOiZun6hw6E+htgjTMX7s=; b=KPaT3hGfkLAup8xAMQkKaA4PHgqUK4nQ3T5pdYZbLtNUVNLzsGVavWHJX4t1QxWmx7 P/dsK2BwFhpjenYvKUVYLNBHdRnRQtoKRpbQRpOdUndXSQM+IJp1kKucDqSG7vXoB0iD 6Ackdp1hwImim205blTrViJpzSYvkvVYK3Xi7BgJGbceXAkPTI7udOeZ+23sapmBCLZ6 Sp9xT7rjHdYwRqrhNcl1+dC3zQYmw+B8JTiJjtk/T9mzVA/DyhRf2OKHHMj3Ah0dKm7O sWEWHvi8cxrwLM+xEE77uK746VuLMapwLgcAkR86jlOfABB3VvadXpYiEXPmYGvikEAk Z4zw== Received: by 10.180.101.230 with SMTP id fj6mr1316829wib.13.1335838033202; Mon, 30 Apr 2012 19:07:13 -0700 (PDT) Received: from [192.168.1.37] (122.237.66.86.rev.sfr.net. [86.66.237.122]) by mx.google.com with ESMTPS id k6sm32643064wie.9.2012.04.30.19.07.11 (version=SSLv3 cipher=OTHER); Mon, 30 Apr 2012 19:07:11 -0700 (PDT) Subject: [PATCH net-next] net: add a prefetch in socket backlog processing From: Eric Dumazet To: David Miller Cc: netdev Date: Tue, 01 May 2012 04:07:09 +0200 Message-ID: <1335838029.11396.12.camel@edumazet-glaptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eric Dumazet TCP or UDP stacks have big enough latencies that prefetching next pointer is worth it. Signed-off-by: Eric Dumazet --- net/core/sock.c | 1 + 1 file changed, 1 insertion(+) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/net/core/sock.c b/net/core/sock.c index 836bca6..1a88351 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1700,6 +1700,7 @@ static void __release_sock(struct sock *sk) do { struct sk_buff *next = skb->next; + prefetch(next); WARN_ON_ONCE(skb_dst_is_noref(skb)); skb->next = NULL; sk_backlog_rcv(sk, skb);