From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison
 overwritten
Date: Tue, 05 Jul 2011 07:33:29 +0200
Message-ID: <1309844009.2720.39.camel@edumazet-laptop>
References: <bug-38102-10286@https.bugzilla.kernel.org/>
	 <20110629145135.5179fb0c.akpm@linux-foundation.org>
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	 <CAB9v_DG7e8vDE+4PDwuOR2DYG1FEvUM1fxa+e4a=swwTYGJ9nQ@mail.gmail.com>
	 <20110704130531.37cf876e@Nokia-N900>
	 <1309787822.2247.6.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
	 <20110704162726.4072e715@maggie> <20110704164351.338dc12e@maggie>
	 <1309792323.2247.33.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
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	 <1309839068.2720.15.camel@edumazet-laptop>
	 <1309839258.2720.17.camel@edumazet-laptop>
	 <CAB9v_DGSFAG9V0jqem+tDP3G-N8v6Z+_6oKdPwL-ZwhfhCOZnw@mail.gmail.com>
	 <1309839928.2720.23.camel@edumazet-laptop>
	 <CAB9v_DEOhZh37aqx1qrLnrz5+tqjcjgBx-DP6M_0NkygZ1LjcQ@mail.gmail.com>
	 <1309840708.2720.31.camel@edumazet-laptop>
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Cc: Michael =?ISO-8859-1?Q?B=FCsch?= <m@bues.ch>,
	Andrew Morton <akpm@linux-foundation.org>,
	netdev@vger.kernel.org, Gary Zambrano <zambrano@broadcom.com>,
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To: Alexey Zaytsev <alexey.zaytsev@gmail.com>
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Le mardi 05 juillet 2011 =C3=A0 09:18 +0400, Alexey Zaytsev a =C3=A9cri=
t :

> Actually, I've added a trace to show b44_init_rings and b44_free_ring=
s
> calls, and they are only called once, right after the driver is
> loaded. So it can't be related to START_RFO. Will attach the diff and
> dmesg.

Thanks

I was wondering if DMA could be faster if providing word aligned
addresses, could you try :

-#define RX_PKT_OFFSET          (RX_HEADER_LEN + 2)
+#define RX_PKT_OFFSET          (RX_HEADER_LEN + NET_IP_ALIGN)

(On x86, we now have NET_IP_ALIGN =3D 0 since commit ea812ca1)