netdev - Re: [PATCH] tg3 : avoid an expensive divide

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20070206.132558.88342464.davem@davemloft.net>
Date:	Tue, 06 Feb 2007 13:25:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	dada1@...mosbay.com, netdev@...r.kernel.org
Subject: Re: [PATCH] tg3 : avoid an expensive divide

From: "Michael Chan" <mchan@...adcom.com>
Date: Tue, 06 Feb 2007 14:05:41 -0800

> On Tue, 2007-02-06 at 21:53 +0100, Eric Dumazet wrote:
> 
> > Signed-off-by: Eric Dumazet <dada1@...mosbay.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.

Ok, I'll take care of this.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html