From: "Michael Chan" <mchan@broadcom.com>
To: "Eric Dumazet" <dada1@cosmosbay.com>
Cc: "David Miller" <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [PATCH] tg3 : avoid an expensive divide
Date: Tue, 06 Feb 2007 14:05:41 -0800 [thread overview]
Message-ID: <1170799541.3535.25.camel@rh4> (raw)
In-Reply-To: <45C8EAC4.9020803@cosmosbay.com>
On Tue, 2007-02-06 at 21:53 +0100, Eric Dumazet wrote:
> Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
> plain text document attachment (tg3_avoid_divide.patch)
> --- linux-2.6.20/drivers/net/tg3.c.orig 2007-02-06 22:30:39.000000000 +0100
> +++ linux-2.6.20-ed/drivers/net/tg3.c 2007-02-06 22:32:42.000000000 +0100
> @@ -3384,7 +3384,7 @@
> }
> next_pkt_nopost:
> sw_idx++;
> - sw_idx %= TG3_RX_RCB_RING_SIZE(tp);
> + sw_idx &= (TG3_RX_RCB_RING_SIZE(tp) - 1);
>
> /* Refresh hw_idx to see if there is new work */
> if (sw_idx == hw_idx) {
There are other places doing similar divide (e.g. tg3_recycle_rx(),
tg3_alloc_rx_skb()). I think we should change them all.
next prev parent reply other threads:[~2007-02-06 21:21 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-03 16:33 [PATCH/RFC 00/10] Transparent proxying patches version 4 KOVACS Krisztian
2007-01-03 16:34 ` [PATCH/RFC 01/10] Implement local diversion of IPv4 skbs KOVACS Krisztian
2007-01-10 6:46 ` Patrick McHardy
2007-01-10 9:31 ` Balazs Scheidler
2007-01-10 12:32 ` Patrick McHardy
2007-01-10 13:27 ` Ingo Oeser
2007-01-10 13:42 ` Patrick McHardy
2007-01-11 14:05 ` KOVACS Krisztian
2007-01-10 10:17 ` KOVACS Krisztian
2007-01-10 12:19 ` Patrick McHardy
2007-01-16 12:49 ` KOVACS Krisztian
2007-01-16 13:19 ` Patrick McHardy
2007-01-03 16:34 ` [PATCH/RFC 02/10] Port redirection support for TCP KOVACS Krisztian
2007-01-03 16:35 ` [PATCH/RFC 03/10] Don't do the TCP socket lookup if we already have one attached KOVACS Krisztian
2007-01-03 16:35 ` [PATCH/RFC 04/10] Don't do the UDP " KOVACS Krisztian
2007-01-03 16:36 ` [PATCH/RFC 05/10] Remove local address check on IP output KOVACS Krisztian
2007-01-10 6:47 ` Patrick McHardy
2007-01-10 10:01 ` KOVACS Krisztian
2007-02-06 14:36 ` IP_FREEBIND and CAP_NET_ADMIN (was: Re: [PATCH/RFC 05/10] Remove local address check on IP output) KOVACS Krisztian
2007-02-06 19:46 ` IP_FREEBIND and CAP_NET_ADMIN David Miller
2007-02-06 20:53 ` [PATCH] tg3 : avoid an expensive divide Eric Dumazet
2007-02-06 21:19 ` David Miller
2007-02-06 22:09 ` Michael Chan
2007-02-06 21:27 ` David Miller
2007-02-07 9:54 ` Andi Kleen
2007-02-07 9:45 ` David Miller
2007-02-07 9:56 ` Eric Dumazet
2007-02-07 10:27 ` Andi Kleen
2007-02-06 22:05 ` Michael Chan [this message]
2007-02-06 21:25 ` David Miller
2007-02-06 21:35 ` Eric Dumazet
2007-02-06 22:17 ` David Miller
2007-01-03 16:36 ` [PATCH/RFC 06/10] Create a tproxy flag in struct sk_buff KOVACS Krisztian
2007-01-03 16:37 ` [PATCH/RFC 07/10] Export UDP socket lookup function KOVACS Krisztian
2007-01-03 16:37 ` [PATCH/RFC 08/10] iptables tproxy table KOVACS Krisztian
2007-01-10 12:40 ` Patrick McHardy
2007-01-03 16:38 ` [PATCH/RFC 09/10] iptables TPROXY target KOVACS Krisztian
2007-01-10 12:45 ` Patrick McHardy
2007-01-03 16:38 ` [PATCH/RFC 10/10] iptables tproxy match KOVACS Krisztian
2007-01-03 17:23 ` [PATCH/RFC 00/10] Transparent proxying patches version 4 Evgeniy Polyakov
2007-01-08 20:30 ` KOVACS Krisztian
2007-01-03 19:33 ` Lennert Buytenhek
2007-01-04 12:13 ` KOVACS Krisztian
2007-01-04 12:16 ` Lennert Buytenhek
2007-01-07 14:11 ` Harald Welte
2007-01-07 16:11 ` Lennert Buytenhek
2007-01-07 23:58 ` Harald Welte
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