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Message-ID: <20090115134055.GA15551@ee.oulu.fi> Date: Thu, 15 Jan 2009 15:40:55 +0200 From: Pekka Pietikainen <pp@...oulu.fi> To: Mihai Donțu <mihai.dontu@...il.com> Cc: Herbert Xu <herbert@...dor.apana.org.au>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: b44 - swapper: page allocation failure On Thu, Jan 15, 2009 at 03:27:43PM +0200, Mihai Donțu wrote: > > > A friend of mine just booted 2.6.28 and when someone else tried to send > > > something to him over ssh (scp), the transfer failed and the following > > > appeared in dmesg: > > You missed the all important order line before the stack trace. > Right, sorry for that. Here it is: > swapper: page allocation failure. order:0, mode:0x21 > > If it's order 0, then you're just out of memory, if it's greater > > than order 0, then either you're using jumbo frames or b44 is > > broken. > It is order zero, but he's not out of memory. He has just booted 2.6.28 (no X, > no thing), has 3GB of RAM and 2GB of swap. b44 uses GFP_DMA bounce buffers in some situations (x86_64 with > 1GB of memory would do the trick I think, as does x86 with 4:4 memory split), and that's a very limited resource (Memory < 16MB ). Lovely hardware feature requiring nasty workarounds (the chip can't do DMA for addresses > 1GB). Maybe something else sucks up GFP_DMA memory with 2.6.28? -- 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
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