From: Eric Dumazet <dada1@cosmosbay.com>
To: Michael Chan <mchan@broadcom.com>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [PATCH] tg3 : avoid an expensive divide
Date: Tue, 06 Feb 2007 22:35:19 +0100 [thread overview]
Message-ID: <45C8F497.2020700@cosmosbay.com> (raw)
In-Reply-To: <1170799541.3535.25.camel@rh4>
Michael Chan a écrit :
> 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.
Well, I checked whole tg3.o with objdump --disassemble and there are only
three points using a div : tg3_nvram_phys_addr()/tg3_set_eeprom() &
tg3_open(), wich are seldom used :)
Eric
next prev parent reply other threads:[~2007-02-06 21:44 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
2007-02-06 21:25 ` David Miller
2007-02-06 21:35 ` Eric Dumazet [this message]
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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