linux-kernel - Re: allocation failed: out of vmalloc space error treating and VIDEO1394 IOC LISTEN CHANNEL ioctl failed problem

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Date:	Sun, 14 Jan 2007 12:48:00 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Peter Antoniac <theSeinfeld@...rs.sf.net>,
	linux-kernel@...r.kernel.org,
	libdc1394-devel@...ts.sourceforge.net,
	linux1394-devel@...ts.sourceforge.net
Subject: Re: allocation failed: out of vmalloc space error treating and
	VIDEO1394 IOC LISTEN CHANNEL ioctl failed problem

On Sun, 2007-01-14 at 21:31 +0100, Stefan Richter wrote:
> On 14 Jan, Arjan van de Ven wrote:
> > vmalloc space is limited; you really can't assume you can get any more
> > than 64Mb or so (and even then it's thight on some systems already);
> 
> I suppose "grep VmallocChunk /proc/meminfo" shows what is available?
> 
> > it really sounds like vmalloc space isn't the right solution for your
> > problem whatever it is (context is lost in the quoted mail)...
> > can you restate the problem to see if there's a better solution
> > possible?
> 
> Thanks. Below is Peter's message to linux1394-devel. The previous
> discussion went over libdc1394-devel which I don't receive. Obviously he
> wants a really large buffer for reception of an isochronous stream. I
> guess his reason is highly application specific...


but why does that even use vmalloc? You can just do a scatter gather
thing instead... and keep a list of pages that you're mapping into
userspace. vmalloc isn't really a requirement for that....

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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