netdev - Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison overwritten

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Message-ID: <1309844009.2720.39.camel@edumazet-laptop>
Date:	Tue, 05 Jul 2011 07:33:29 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexey Zaytsev <alexey.zaytsev@...il.com>
Cc:	Michael Büsch <m@...s.ch>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Gary Zambrano <zambrano@...adcom.com>,
	bugme-daemon@...zilla.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Pekka Pietikainen <pp@...oulu.fi>,
	Florian Schirmer <jolt@...box.org>,
	Felix Fietkau <nbd@...nwrt.org>, Michael Buesch <mb@...sch.de>
Subject: Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison
 overwritten

Le mardi 05 juillet 2011 à 09:18 +0400, Alexey Zaytsev a écrit :

> Actually, I've added a trace to show b44_init_rings and b44_free_rings
> 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 = 0 since commit ea812ca1)



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